OFFICIAL CHEMISTRY DISCUSSION





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Discus: SAT/ACT Tests and Test Preparation: June 2004 Archive: OFFICIAL CHEMISTRY DISCUSSION
By Aab123 (Aab123) on Saturday, June 05, 2004 - 11:06 am: Edit

Remember, no answers till 12:00 Eastern

What did you guys think?

I thought it was kina hard, to me the T/F was killer.

IM me at aabizgod if you wanna talk.

By Krbxtigerz (Krbxtigerz) on Saturday, June 05, 2004 - 11:23 am: Edit

I thought it was fair....except some questions..

By Maverick27 (Maverick27) on Saturday, June 05, 2004 - 11:39 am: Edit

some were ambiguous, and some asked you stuff that was kind of trivial.
overall, wasnt BAD...but still. i would've liked the 800.

By Thunder77 (Thunder77) on Saturday, June 05, 2004 - 11:47 am: Edit

Yeah,

Usually I'm absolutely positive of the answers to the questions.. But on this test I eliminated answers a lot and kinda made educated guesses

Most of my anwers were correct(I hope), but I wasn't feeling as confident as my practice tests.

By Aab123 (Aab123) on Saturday, June 05, 2004 - 12:04 pm: Edit

bump

By Basketball2k79 (Basketball2k79) on Saturday, June 05, 2004 - 12:36 pm: Edit

alrite so what were the first couple questions about yellow/green solids and gases..i think i put chlorine for both but i hear its sulfur..

what was the answer choice about decantation?

everyone post up all the questions they remember so i can guess my score..what is the scale supposed to be around 6?

By Aab123 (Aab123) on Saturday, June 05, 2004 - 12:41 pm: Edit

I believe the gas is chlorine, and the solid is sulfur.

I got both those wrong.

Decantation is when you let the solid settle at the bottom.

What do you mean by scale? I'm hoping for 12 wrong, so thatll be a 740 (I skipped 3)

Does anyone remember the T/F?

By Aab123 (Aab123) on Saturday, June 05, 2004 - 12:48 pm: Edit

bump, let's go people

By Cortnee (Cortnee) on Saturday, June 05, 2004 - 12:51 pm: Edit

i only got like two CE answers, but i skipped 3 T/F

By Basketball2k79 (Basketball2k79) on Saturday, June 05, 2004 - 12:53 pm: Edit

i thought the T/F was pretty easy there was one about transition d metals where like they said zinc was a better conductor than phosphorous because zinc has twice as many electrons as P

so i am thinking thats T/T but no CE

there was another one about adding what to 2H+ +2Cr204---->H20 + Cr207 and what can you add that wouldnt disturm the equilibrium or something similar to that..anyone remember the answer to that

By Aab123 (Aab123) on Saturday, June 05, 2004 - 12:55 pm: Edit

I said KNO3, cuz K or NO3 is not part of the equation at all.

What did you guys get for best instrument used? I said buret,we always use that in labs.

By Cortnee (Cortnee) on Saturday, June 05, 2004 - 12:56 pm: Edit

i think i put KNO3 b/c it wouldn't form any precipitate or acid with the reactants

By Fea (Fea) on Saturday, June 05, 2004 - 12:58 pm: Edit

For the equilibrium one I put the first one, because a change in volume would cause a change in pressure. A change in pressure favors the side with fewer moles. That was my favorite question

By Aab123 (Aab123) on Saturday, June 05, 2004 - 01:00 pm: Edit

Fea are you talking about the same problem we are? That seems like a pretty interesting response

By Aab123 (Aab123) on Saturday, June 05, 2004 - 01:05 pm: Edit

Here are a couple I wanna get off my mind:

The buret question? Or is it volumetric flask?
The endothermic question, is it that the products will have greater delta H?
Also, for the question with the crystal of KCl being put in, was that all three? Did anyone get all three for like one more of those questions?
In the first section, did anyone get Li twice, and PB TWICE?

By Basketball2k79 (Basketball2k79) on Saturday, June 05, 2004 - 01:06 pm: Edit

fea probably talking about that question with what would have no effect if volume was decreased or something and the answer was A..idk if i put KNO3 i had horrible time management had like 20 minz for the last 35 MC

By Aab123 (Aab123) on Saturday, June 05, 2004 - 01:07 pm: Edit

Yea, the one where it was where the volume was changed, it was A, where there was the number of moles on either side.

By Aab123 (Aab123) on Saturday, June 05, 2004 - 01:09 pm: Edit

Anyone think that the curve will be more leneint for this in comparision to the scale in the Real SAT II book?

By Basketball2k79 (Basketball2k79) on Saturday, June 05, 2004 - 01:12 pm: Edit

up top i got Li twice i odnt remember about PB twice...i skipped the intsrument question..KCL i dont think it was all 3 i dont remember all the answer choices though i think i just put A since III was like decrease temp..and KCL would go baCK into solution..and thats def not true less temp=less solubility more comes out

By Ctgirl (Ctgirl) on Saturday, June 05, 2004 - 01:16 pm: Edit

Did anyone get 3 CE's in a row?

By Basketball2k79 (Basketball2k79) on Saturday, June 05, 2004 - 01:20 pm: Edit

i think i got two and was hesitant about a thirdd

By Fea (Fea) on Saturday, June 05, 2004 - 01:20 pm: Edit

I got 3 CE's total, and definitely not in a row!

By Ctgirl (Ctgirl) on Saturday, June 05, 2004 - 01:23 pm: Edit

Wouldn't HNO3 (strong acid) be formed from H+ and NO3- if KNO3 was added?

By Basketball2k79 (Basketball2k79) on Saturday, June 05, 2004 - 01:24 pm: Edit

^^ yeah i was thinking that it hink i skipped that or something or put KOH since you get K and H20 but than that would shift left

By Basketball2k79 (Basketball2k79) on Saturday, June 05, 2004 - 01:29 pm: Edit

nevermind H doesnt replace K in solution...so it was KNO3 one more wrong for me

By Aab123 (Aab123) on Saturday, June 05, 2004 - 01:31 pm: Edit

thank god I got that right.

Anyone else

By Pinacolada (Pinacolada) on Saturday, June 05, 2004 - 01:37 pm: Edit

are all the regular chemistry multiple choice questions supposed to be filled out in the third test section right next to the T/F/CE section? so were we supposed to skip boxes 1 and 2 and fill in the third one?

By Basketball2k79 (Basketball2k79) on Saturday, June 05, 2004 - 01:41 pm: Edit

i took one test and i filled the answers on the front page and put the t/t/ce on the one on the flip side...idk they can figure it outt

By Pinacolada (Pinacolada) on Saturday, June 05, 2004 - 01:44 pm: Edit

thanks basketball! got paranoid for a moment about instructions. i have a tendency to accidentally ignore proctors

By Vermicelli (Vermicelli) on Saturday, June 05, 2004 - 01:52 pm: Edit

wait? was I supposed to put the regular chem answers right above the T/F/CE cause i put it on the 2nd page at the top

By Shefboyrdi (Shefboyrdi) on Saturday, June 05, 2004 - 01:53 pm: Edit

did anyone get T/T/no CE for the last 2 T/F ones?

By Aab123 (Aab123) on Saturday, June 05, 2004 - 01:56 pm: Edit

That's what I did! But I heard one of them is CE. Other than that I only got 1 CE (I skipped 104, with the wavelength)

By Vermicelli (Vermicelli) on Saturday, June 05, 2004 - 01:57 pm: Edit

yes that's what i got too

By Aab123 (Aab123) on Saturday, June 05, 2004 - 01:59 pm: Edit

Wait, what did you get? And how many CE's did you get in total?

By Newt (Newt) on Saturday, June 05, 2004 - 02:12 pm: Edit

I got 3 or 4, don't remember. Probably 3. I thought it was a lot easier than the Princeton Review books... it was more general. But there was some stuff I didnt know, so I hope they curve it well :)

By Aab123 (Aab123) on Saturday, June 05, 2004 - 02:14 pm: Edit

For the last two T/F questions, I don't think one of them was CE. This is because I believe the second part of one of them was "They are both diatomic molecules" Though this is true, it is not CE. O2 and Br2 are both diatomic, but they are not the same.

By Maverick27 (Maverick27) on Saturday, June 05, 2004 - 02:17 pm: Edit

yeah i got about 3 or 4 CE's but i got A LOADDDDDDDDDDD OF TRUTHS. A LOT OF T'S PPL...any1 else? plz say yes...plz say yes...

By Aab123 (Aab123) on Saturday, June 05, 2004 - 02:19 pm: Edit

Yea, I got a lot of T/F combos. Anyoen get F/F for the first two?

By Newt (Newt) on Saturday, June 05, 2004 - 02:22 pm: Edit

hmmm... on the first half of the CE questions, I got a bunch of false. Did anyone get two FF in a row?

By Jma (Jma) on Saturday, June 05, 2004 - 02:29 pm: Edit

For the first few, I got lithium twice. I put Chlorine for the yellow-green gas, and lead for the dense solid. I put sulfur for the yellow solid. I also put KNO3 since there were no commnon ions and since this would not seem to react witht the others.

WHat did you guys get for the different processes with iron ore, and with Mg(OH)2 for upset stomachs?

By Yumpop (Yumpop) on Saturday, June 05, 2004 - 02:30 pm: Edit

Does anyone know how the Chemistry curve compares to Biology? Which one is nicer?

By Aab123 (Aab123) on Saturday, June 05, 2004 - 02:36 pm: Edit

Upset stomachs is neutralization.

Did anyone get Buret?

Also, did anyone get NaCl, when it was describing a substance, like high melting point?

By Aab123 (Aab123) on Saturday, June 05, 2004 - 02:38 pm: Edit

DOES ANYONE THINK THAT THE CURVE WILL BE MORE THAN IT IS IN THE REAL SAT II BOOK?

By Jma (Jma) on Saturday, June 05, 2004 - 02:40 pm: Edit

I think that the chemistry curve is usually more forgiving.

From my score on the "Real SAT II" book, a 72 out of 85 was around 740-760.
According to Princeton and Kaplans 61 out of 85 is good for a 700. I do not remember the exact biology curve.

By Whirlziggi (Whirlziggi) on Saturday, June 05, 2004 - 02:42 pm: Edit

I dont think the curve changes much. If u ask other ppl, and look thru old sat ii's the curve pretty much only varies by one or two questions (max). So.. it wont be much diff than the curve in teh book.

By Jma (Jma) on Saturday, June 05, 2004 - 02:43 pm: Edit

The high melting point substance which conducts electricity in the molten state was an ionic substance. I cannot remember if it was NaCl but it was the ionic substance listed.

For the double and triple bond questions, Cl2 was the one with single bonds correct?

By Athlonmj (Athlonmj) on Saturday, June 05, 2004 - 02:48 pm: Edit

What did you guys get for the increasing pressure applied to a substance deviating from ideal gas behavior? (It was a T T CE question)

By Maverick27 (Maverick27) on Saturday, June 05, 2004 - 02:55 pm: Edit

i think i got two FFs in a row at the bottom of the first column...but for the second half of the T/F CE, i got one column all Ts and the other one all T's except for one of em. I think about 2(? dont really remember) were CE.

By Succor101 (Succor101) on Saturday, June 05, 2004 - 02:55 pm: Edit

athlon-think it was F,T

anyway, I think buret was the wrong answer...it was the one for the 1.000 M NaCl question...the right answer is volumetric flask.

By Aab123 (Aab123) on Saturday, June 05, 2004 - 02:56 pm: Edit

Jma- NaCl was the only ionic i belive.

Yes, i said Cl2 i think too. Anyone else?

By Aab123 (Aab123) on Saturday, June 05, 2004 - 02:57 pm: Edit

Succor101- Are you sure? Isn't buret the most accurate? It is always used in titrations...

By Succor101 (Succor101) on Saturday, June 05, 2004 - 02:59 pm: Edit

yeah...it's accurate, but usually for preping a sol'n of a certain molarity you use a volumetric flask.

By Aoe2guy (Aoe2guy) on Saturday, June 05, 2004 - 02:59 pm: Edit

What about the question with the KCl(aq) dissociating w/ the seed crystal - it was a roman numeral question. I. It is saturated.
II. If you stir it, the solid stuff goes back into soln.
III. If you cool it, the stuff goes back into soln.

By Esotericstorm (Esotericstorm) on Saturday, June 05, 2004 - 02:59 pm: Edit

Hmm I think I put CE 5 times...but I second guessed myself a lot.

I put volumetric flask for that one since that's all we ever used in class.

I didn't put chlorine for that one bc I always though chlorine gas was colorless, but I'm not sure.

By Athlonmj (Athlonmj) on Saturday, June 05, 2004 - 03:00 pm: Edit

aoe, I put I only. I knew III is false because it'll go back to solid.

By Succor101 (Succor101) on Saturday, June 05, 2004 - 03:00 pm: Edit

KCL Q: I only is the answer

By Aab123 (Aab123) on Saturday, June 05, 2004 - 03:01 pm: Edit

Aoe, i either said 1 and 3 or all three, i don't remember

By Esotericstorm (Esotericstorm) on Saturday, June 05, 2004 - 03:01 pm: Edit

Which one had the greatest percent error?

By Athlonmj (Athlonmj) on Saturday, June 05, 2004 - 03:02 pm: Edit

the first one. It had 2 sig digs and error was +- .2

By Succor101 (Succor101) on Saturday, June 05, 2004 - 03:03 pm: Edit

yep

By Aab123 (Aab123) on Saturday, June 05, 2004 - 03:03 pm: Edit

But if its endothermic...

heat + KCL -> K + Cl

wouldn't lowering heat, cause it to shift to the left, making it go into solution?

By Succor101 (Succor101) on Saturday, June 05, 2004 - 03:06 pm: Edit

huh?
it said it was endothermic?

anyway, if it's endothermic cooling would actually cause equilibrium to shift LEFT and make it go into SOLID

By Vermicelli (Vermicelli) on Saturday, June 05, 2004 - 03:07 pm: Edit

No shifting it to the left makes it precipitate

By Succor101 (Succor101) on Saturday, June 05, 2004 - 03:09 pm: Edit

same thing, vermicelli (yummy)...solid/precipitate

By Aab123 (Aab123) on Saturday, June 05, 2004 - 03:11 pm: Edit

eh, ok. So far I'm sure of 8 wrong. Only 4 more to spare...

By Jma (Jma) on Saturday, June 05, 2004 - 03:12 pm: Edit

For the graphs:

Pressure versus volume was the inverse curve or the hyperbolic curve.

Pressure versus molecules was the direct curve. As moleuces increased, so does pressure.

For temperature cooling versus time, was it was the curve in which it was a straight line with a negative slope or in other words>

By Athlonmj (Athlonmj) on Saturday, June 05, 2004 - 03:14 pm: Edit

pressure vs. molecules? I thought it was like mass vs. volume

By Succor101 (Succor101) on Saturday, June 05, 2004 - 03:16 pm: Edit

it's still the same graph

By Jma (Jma) on Saturday, June 05, 2004 - 03:18 pm: Edit

Yea, I might be thinking of a practice test but as Succor said, it would be the same graph. Also, was carbon (diamond) network covalent.

By Esotericstorm (Esotericstorm) on Saturday, June 05, 2004 - 03:19 pm: Edit

Hmm for the temperature cooling vs. time I don't think I put that one.

By Thunder77 (Thunder77) on Saturday, June 05, 2004 - 03:19 pm: Edit

"What about the question with the KCl(aq) dissociating w/ the seed crystal - it was a roman numeral question. I. It is saturated.
II. If you stir it, the solid stuff goes back into soln.
III. If you cool it, the stuff goes back into soln. "

I put I.
Actually the solution is supersaturated since the stuff precipitated out when seeded, but I is the best answer. II is false because the solution is also supersaturated to the point that when seeded stuff comes out so it cant be true. Cooling it only makes it worse. More heat is required to make the stuff go back into solution.

Can people post up more questions? So far I seem to be doing pretty well, but I hope somebody who remembers a questions posts it up so we can discuss and see whether I got it right or wrong.

By Athlonmj (Athlonmj) on Saturday, June 05, 2004 - 03:20 pm: Edit

darn, I didn't choose a curve for mass vs. volume... i chose the line LOL

By Succor101 (Succor101) on Saturday, June 05, 2004 - 03:21 pm: Edit

cooling-wasn't it from some temp between 0 and 100 to -20?

By Athlonmj (Athlonmj) on Saturday, June 05, 2004 - 03:22 pm: Edit

yeah, that one was easy

By Jma (Jma) on Saturday, June 05, 2004 - 03:22 pm: Edit

I thought it was 80 - 20. If it was to -20, then you would choose the graph with the horizontal line.

By Thunder77 (Thunder77) on Saturday, June 05, 2004 - 03:23 pm: Edit

For temperature vs cooling time,

the answer is the graph with the break, where the line slants down, then goes horizontal, and then slants down again. This is because the water is freezing and no tem change occurs until are water are turned into ice. Since the temp of water goes down to -10, it must go through that stage.

By Jma (Jma) on Saturday, June 05, 2004 - 03:24 pm: Edit

For burning KClO3, what percent did you get. The choices were 35, 39, 61, 65 and one other.

By Succor101 (Succor101) on Saturday, June 05, 2004 - 03:24 pm: Edit

here's a Q:

N2 + 3H2 --> 2NH3

if you had 2.0 g H2 & excess N2, how much NH3 do you get (mol)

answer is .67

By Thunder77 (Thunder77) on Saturday, June 05, 2004 - 03:24 pm: Edit

im pretty sure it went below O degrees.

By Athlonmj (Athlonmj) on Saturday, June 05, 2004 - 03:24 pm: Edit

i got 39% KCLo3

By Succor101 (Succor101) on Saturday, June 05, 2004 - 03:25 pm: Edit

KCLO3: 39%

By Aoe2guy (Aoe2guy) on Saturday, June 05, 2004 - 03:26 pm: Edit

Some questions-
1- "T/F/CE" question - the simplest compound formed by X and Y question
2 - q. at the end on oxygen with the roman numerals i think they said
I. colorless gas
II slightly soluble in water
III. supports combustion
3-mult choice on properties of transition metals and which one was false - two choices of that q. were D) same physical properties of other metals and E) same chemical properties of unreactive nonmetals
4 - which thing makes atoms take up volume - A)nucleus B)protons C)neutrons d)electrons e)photons
5 - lab q. with percent comp of oxygen in potassium chlorate

By Jma (Jma) on Saturday, June 05, 2004 - 03:28 pm: Edit

Man. I knew I would make at least one careless mistake but I specifically read that question twice to make sure it did not go below zero degrees. That one hurts. I assumed that the dash was representing "to."

However, I did get .67 also, and for the NaOH neutralization where it went from .1 ml to 25.1, what did you guys get?

By Succor101 (Succor101) on Saturday, June 05, 2004 - 03:29 pm: Edit

.25 M NaOH

By Thunder77 (Thunder77) on Saturday, June 05, 2004 - 03:30 pm: Edit

Ok,

For X and Y compound one, it was F and F

For properties of transiton metals, it was I and II and NOT III (same chemical properties of unreactive nonmetals) because i thought nonreactive nonmetals would be like Nobel Gases

Atoms taking up volume... I put electrons since the orbitals take up 99% of the atom's radius

potassium chlorate was KClO3, so you can figure out from there .

By Jma (Jma) on Saturday, June 05, 2004 - 03:31 pm: Edit

For O2, I put I, II, and III. I did not know that O2 was soluble however I and III were definitely correct and that choice was not offered. Thus, I put E or I,II, III.

For transition metlas, I put E, same chemical properties of unreactive nonmetals. Not positive though.

I put electrons for volume. Also not sure.

By Succor101 (Succor101) on Saturday, June 05, 2004 - 03:32 pm: Edit

that electrons 'n volume q was actually somewhat inccorect...most of an atom is empty space...the electron cloud occupies most of space, not electron itself

By Esotericstorm (Esotericstorm) on Saturday, June 05, 2004 - 03:33 pm: Edit

Electrons make up an atom's volume.

39% O2 in KClO3

I got .250 M I think, but I'm pretty sure I did it wrong.

By Aoe2guy (Aoe2guy) on Saturday, June 05, 2004 - 03:33 pm: Edit

wait what? lol the transition metal question wasnt a roman numeral question, but i did put that "they have the same chem properties of unreactive non metals" as the answer since it asked for the false statement.

By Thunder77 (Thunder77) on Saturday, June 05, 2004 - 03:34 pm: Edit

I know.. but it was the best answer. I assumed electron was the answer that they wanted.

They wouldn't really require you to Actually know the compare the sizes between a proton and a neutron, Correct? Electron is definitely the smallest, though, but it "occupies" most of the space through its orbitals.

By Jma (Jma) on Saturday, June 05, 2004 - 03:34 pm: Edit

For the percent of Aluminum, I put 53%. Barrons had the same exact question.

There was also a question involving liters of gases and the volume given was three. I got 9 liters for the answer since the mole ratio was one to three.

By Succor101 (Succor101) on Saturday, June 05, 2004 - 03:35 pm: Edit

wondering...how many practice tests from the CB did you guys take...I only had the one from the real SATII...where can you get more?

anyway, I thought that one was harder than this one

By Thunder77 (Thunder77) on Saturday, June 05, 2004 - 03:36 pm: Edit

Yes, it was 9 liters.

I also meant to say that III was false. I and II is correct, but they ask for which is false, so III is false and is the answer.

By Aoe2guy (Aoe2guy) on Saturday, June 05, 2004 - 03:37 pm: Edit

Thunder which question are you talking about? the oxygen question?

By Jma (Jma) on Saturday, June 05, 2004 - 03:38 pm: Edit

AOE2guy, If I remember correctly, that question was not roman numeral.

There was also a T/F/CE question involving electron levels being quantized and Hydrogen only absorbing specific amounts of energy. I think i put T/T/CE.

By Aoe2guy (Aoe2guy) on Saturday, June 05, 2004 - 03:38 pm: Edit

also - im not sure if someone already asked this, but how does the curve on the real chem sat2 compare to the one in the book? Personally, i felt the book test was easier but not sure if that means a better curve. I'm just used to hearing that you can get 7x on this test and still get an 800

By Aoe2guy (Aoe2guy) on Saturday, June 05, 2004 - 03:40 pm: Edit

jma - i agree on hte hydrogen question.

By Jma (Jma) on Saturday, June 05, 2004 - 03:40 pm: Edit

What was the answer to the question where it said:

Which substance will form a strong acidic solution when it reacts with water.

A. LiF
B. NH3
C SO3

those are the choices I remember.

By Jma (Jma) on Saturday, June 05, 2004 - 03:40 pm: Edit

What was the answer to the question where it said:

Which substance will form a strong acidic solution when it reacts with water.

A. LiF
B. NH3
C SO3

those are the choices I remember.

By Athlonmj (Athlonmj) on Saturday, June 05, 2004 - 03:41 pm: Edit

SO3

By Fea (Fea) on Saturday, June 05, 2004 - 03:41 pm: Edit

Shouldn't there have been a levelling out in the middle, jma? It changed phases

By Succor101 (Succor101) on Saturday, June 05, 2004 - 03:43 pm: Edit

C

By Jma (Jma) on Saturday, June 05, 2004 - 03:44 pm: Edit

As I said, I misread the question. Assuming that a change of phase occurred, then the kinetic energy would not have changed and the graph certainly would have leveled out. So you are definitely correct.

By Aoe2guy (Aoe2guy) on Saturday, June 05, 2004 - 03:45 pm: Edit

Again, does anyone want to comment on the oxygen roman numeral question towards the end? Also, on the curve.

By Thunder77 (Thunder77) on Saturday, June 05, 2004 - 03:46 pm: Edit

I chose C, SO3, as an educated guess.

I heard Nonmetallic Oxide forms acidic solutions in water, so I figured thats the only one that mae sense,.

What did you other ppl put?

Gotta work now.. I'll check back later

By Succor101 (Succor101) on Saturday, June 05, 2004 - 03:47 pm: Edit

I,II,III for O2

By Aoe2guy (Aoe2guy) on Saturday, June 05, 2004 - 03:48 pm: Edit

excellent.......does anyone know about the curve? maybe i should make a new thread

By Newt (Newt) on Saturday, June 05, 2004 - 03:50 pm: Edit

I chose SO3 because it was the only one that formed a strong acid... probably not the best way to do it, but thats what I did.

By Athlonmj (Athlonmj) on Saturday, June 05, 2004 - 03:50 pm: Edit

hey guys, AIM Chat: Chemistry

By Succor101 (Succor101) on Saturday, June 05, 2004 - 03:53 pm: Edit

CURVE:
78 to 85 raw score is an 800
77,76=790
75,74=780
73,72=770
71,70=760
...

source: real SAT II chemistry 1994 test

By Aoe2guy (Aoe2guy) on Saturday, June 05, 2004 - 03:55 pm: Edit

yeah i know, but i'm asking for the relationship between the actual test's curve and the practice test's curve.

By Jma (Jma) on Saturday, June 05, 2004 - 03:57 pm: Edit

What were the two answers to teh questions with the substance having a molecular mass of 106 g.

One of them was that you were given 10.6 g. I do not remember the others.

By Jma (Jma) on Saturday, June 05, 2004 - 03:57 pm: Edit

What were the two answers to teh questions with the substance having a molecular mass of 106 g.

One of them was that you were given 10.6 g. I do not remember the others.

By Succor101 (Succor101) on Saturday, June 05, 2004 - 03:57 pm: Edit

oh...my guess is exactly the same, maybe +-1 raw point on the scale

By Jma (Jma) on Saturday, June 05, 2004 - 04:04 pm: Edit

Was the iron extraction question reduction? Also, for the Kc, the answer I had was

[product1]^10[product2] / [reactant]

All were in the gaseous phase and thus i put all species in the equation.

By Aoe2guy (Aoe2guy) on Saturday, June 05, 2004 - 04:08 pm: Edit

i put reduction for that one, the other ones didnt appear to make too much sense to me. i could be wrong.

By Succor101 (Succor101) on Saturday, June 05, 2004 - 04:24 pm: Edit

say...that question for the pressure of the gas in the second flask...the answer was 600, right?

By Athlonmj (Athlonmj) on Saturday, June 05, 2004 - 04:25 pm: Edit

yes

By Aab123 (Aab123) on Saturday, June 05, 2004 - 04:38 pm: Edit

Doesn't the nucelus take up the most space?

By Succor101 (Succor101) on Saturday, June 05, 2004 - 04:41 pm: Edit

most of the mass, not space

By Aab123 (Aab123) on Saturday, June 05, 2004 - 04:46 pm: Edit

Sorry, for the mass/volume graph, did that curve upwards? I think it was letter B, to describe it better the "hump" was facing up, and it finished higher than the beginning

By Aab123 (Aab123) on Saturday, June 05, 2004 - 04:48 pm: Edit

like this http://www.mbendi.co.za/pics/graphs/HyperbolicCreamCurve.gif

By Jma (Jma) on Saturday, June 05, 2004 - 04:49 pm: Edit

I also got 600 mm Hg for the question with the gas samples y and x. My success will essentially be dependent on the true false section. Besides one reading mistake, I seem to be doing quite well.

By Aab123 (Aab123) on Saturday, June 05, 2004 - 04:50 pm: Edit

Also, in the T/F, the second part of one question was that when the molecules come closer together, the intermolecular forces are more important? Isn't this false, because when it begins to pull away, then the intermolecular become more important?

What was the first part of this question?

By Aoe2guy (Aoe2guy) on Saturday, June 05, 2004 - 04:50 pm: Edit

I'm pissed off that there weren't any flame test questions on this thing - i actually looked some of that stuff over.

Question - did you guys put Pb as the thing that only exists in positive oxidation states or something.

By Aoe2guy (Aoe2guy) on Saturday, June 05, 2004 - 04:51 pm: Edit

Aab what was the first part of that question.

By Aab123 (Aab123) on Saturday, June 05, 2004 - 04:52 pm: Edit

I said that.

By Basketball2k79 (Basketball2k79) on Saturday, June 05, 2004 - 04:52 pm: Edit

mass over volume thats density which is a set value so if mass increases than volume increases..i thought itd be the straight line goin up to the right

By Fea (Fea) on Saturday, June 05, 2004 - 04:54 pm: Edit

When do we get the results?

By Scion (Scion) on Saturday, June 05, 2004 - 04:54 pm: Edit

"Pressure versus volume was the inverse curve or the hyperbolic curve."

wasnt it the straight line w/ a negative slope?

and for the KNO3 one, wouldnt the NO3 attract the H+, affecting the equilibrium?

and yeah to whoever asked about the T/F/CE section, I THINK i got F/F for the first two. for sure, the first one. and did anyone get 5 T/T/CEs?

By Basketball2k79 (Basketball2k79) on Saturday, June 05, 2004 - 04:55 pm: Edit

june 18 online at collegeboard ironically day before i hit up cali for vacation

By Aoe2guy (Aoe2guy) on Saturday, June 05, 2004 - 04:56 pm: Edit

pressure and volume is inverse variation (slants). the one with a negative slope is direct variation in another direction.


AAB- what was the first part of that T/F/CE question with the gases that you told me the 2nd part?

By Aab123 (Aab123) on Saturday, June 05, 2004 - 04:56 pm: Edit

Also, for the oxygen leaving the solution- was it different each time becuase the solution was not properly cooled?

By Scion (Scion) on Saturday, June 05, 2004 - 04:57 pm: Edit

aoe2guy, yeah thats what i meant about the line. so am i right, cuz i did put the inverse straight line.

By Aab123 (Aab123) on Saturday, June 05, 2004 - 04:57 pm: Edit

It was like ideal gas deviation...I dunno...did we talk abou tthis online?

By Jma (Jma) on Saturday, June 05, 2004 - 04:57 pm: Edit

Think about it mathematically.

PV = K. Therefore, the graph will be a hyperbola.

For the equilibrium question I put KNO3. According to someone else who posted, the H+ would not replace the K and thus this would not be an issue.

By Scion (Scion) on Saturday, June 05, 2004 - 04:57 pm: Edit

yeah aab, about the oxygen one, thats what i put

By Aab123 (Aab123) on Saturday, June 05, 2004 - 04:59 pm: Edit

Alright good.

By Scion (Scion) on Saturday, June 05, 2004 - 04:59 pm: Edit

jma, i put NH3. that wouldnt affect the reaction, right? cuz KNO3 dissolves, and the NO3 would "suck up" the H+.

By Scion (Scion) on Saturday, June 05, 2004 - 05:00 pm: Edit

who got 5 t/t/ce's, or around that?

By Aoe2guy (Aoe2guy) on Saturday, June 05, 2004 - 05:00 pm: Edit

AAB - just to clarify the answer choice, it said that the substance was weighed while it was still warm.

AAB - also for that gas question, i think the first part said that "gases are most ideal under low temp and high pressure" BECAUSE "as you increase pressure the forces become more important"....that was F, T

By Jma (Jma) on Saturday, June 05, 2004 - 05:01 pm: Edit

I assumed that the NH3 would react to form NH4 which would reduce the concentration of H+ but I am not sure about this question.

By Aab123 (Aab123) on Saturday, June 05, 2004 - 05:02 pm: Edit

i don't remember wat I did for the first part of that question, but i said F for the second part...if the pressure is lower, the gas molecules will spread out more. Doesn't that mean the intermolecular are more imporant then, becuase they are holding them together?

By Thunder77 (Thunder77) on Saturday, June 05, 2004 - 05:03 pm: Edit

Also, for the oxygen leaving the solution- was it different each time becuase the solution was not properly cooled?

Nope, I put it was because there was still KClO3(potassium chlorate) in the solution. Not all of the O2 have been evaporate from it, so it still keeps on losing mass until all the O2 has evaported as it is being heated.

Anyone confirm?

By Aab123 (Aab123) on Saturday, June 05, 2004 - 05:03 pm: Edit

Scion- my friends got 3 CE's. Did one of them happen to be in the wavelength questoin, cuz I skipped that

By Aoe2guy (Aoe2guy) on Saturday, June 05, 2004 - 05:04 pm: Edit

i think the answer is KNO3. Since HNO3 is a strong acid, the conjugate base NO3- is a weak Bronsted base(proton acceptor) and therefore doesn't have the power to "suck up an H." thats what i think

By Aab123 (Aab123) on Saturday, June 05, 2004 - 05:05 pm: Edit

Thunder, other people have said that the not properly cooled thing was right.

By Aab123 (Aab123) on Saturday, June 05, 2004 - 05:05 pm: Edit

Thunder, other people have said that the not properly cooled thing was right.

By Thunder77 (Thunder77) on Saturday, June 05, 2004 - 05:05 pm: Edit

""i don't remember wat I did for the first part of that question, but i said F for the second part...if the pressure is lower, the gas molecules will spread out more. Doesn't that mean the intermolecular are more imporant then, becuase they are holding them together? ""

Nope, intermolecualr forces are only significant in small volumes caused by an increase in pressure.
In large volumes, the molecules are too far apart and thus the intermolecular forces are too weak to cause any significant changes.

By Jma (Jma) on Saturday, June 05, 2004 - 05:06 pm: Edit

Ao32guy, I got the same answer for the t/f question regarding ideal gases.

Is anyone sure of the answer with equilibrium? What would it be?

By Aoe2guy (Aoe2guy) on Saturday, June 05, 2004 - 05:06 pm: Edit

Thunder - i dont see how your answer choice explains why there was such a drastic drop the firt time and not between the 2nd and 3rd

By Aoe2guy (Aoe2guy) on Saturday, June 05, 2004 - 05:07 pm: Edit

Jma - i put KNO3 and i explained why i think its right and hte arguments against it are wrong

By Basketball2k79 (Basketball2k79) on Saturday, June 05, 2004 - 05:11 pm: Edit

i am with Thunder since i dont think all the O2 was taking out of the KCLO3 so thats why it dropped significally since it wasnt heated enough..how can a substance be improperly cooled anyway

By Thunder77 (Thunder77) on Saturday, June 05, 2004 - 05:11 pm: Edit

I thought that more O2 had evaporated the first time it was heated. Thus the most significant drop in mass was in the first time.

Later, since there are only very O2 left in the compound, additional heating would cause what little O2 is left to evaporte, thus causing the lower decrease in mass.

Can you please explain your answer as well? I may be confused.

By Aoe2guy (Aoe2guy) on Saturday, June 05, 2004 - 05:12 pm: Edit

Who was talking before about someone getting Pb twice in the beginning in that matching section? I think i just put it for being the only thing in hte list that was only positive in oxidation states.

By Thunder77 (Thunder77) on Saturday, June 05, 2004 - 05:13 pm: Edit

Pb was also the dense substance.

By Jma (Jma) on Saturday, June 05, 2004 - 05:16 pm: Edit

Can anyone think of some other questions that were on the test which we have not covered.

By Aoe2guy (Aoe2guy) on Saturday, June 05, 2004 - 05:17 pm: Edit

first of all, just a kind of clear but annoying reason why i think my answer is right.
- i've seen a question in review book tests about good laboratory procedure, and they ask sometimes which isnt a good procedure - the answer is "not waiting to weigh a substance until it is cool"..i think this lab was a perfect application of that question

By Thunder77 (Thunder77) on Saturday, June 05, 2004 - 05:18 pm: Edit

somebody explain why you think my answer is wrong and why yours is correct.

im not sure

By Jma (Jma) on Saturday, June 05, 2004 - 05:18 pm: Edit

Here are some other questions:

What is the most likely compound for Arsenic to form with H. I put AsH3 since both P and N (same group) will react with H to form NH3 and PH3.

Also:

How many unpaired electrons are there in phosphorous (I think).

I put 3 since there were three p electrons each of which would be alone in a p orbital.

By Aoe2guy (Aoe2guy) on Saturday, June 05, 2004 - 05:19 pm: Edit

The dense substance? what was the full description of that question thunder?

By Thunder77 (Thunder77) on Saturday, June 05, 2004 - 05:19 pm: Edit

but how do you know whether it was cooled or not? Heating my caused some of the changes, but I dont think it will change it that significantly, Will it?

And how is my explanation wrong?

By Aoe2guy (Aoe2guy) on Saturday, June 05, 2004 - 05:20 pm: Edit

Jma i agree with u on both, same reasoning.

By Basketball2k79 (Basketball2k79) on Saturday, June 05, 2004 - 05:21 pm: Edit

uhhh for the arsenic thing i was hestitant but i think i put ash3 and for the unpair electrons i put two..i thought it meant when bonded to something...so phosphorous would make 3 bonds leaving two left..but idk i think i just read wrong and rushed cuz obviusly phos got 3 valence

By Basketball2k79 (Basketball2k79) on Saturday, June 05, 2004 - 05:21 pm: Edit

uhhh for the arsenic thing i was hestitant but i think i put ash3 and for the unpair electrons i put two..i thought it meant when bonded to something...so phosphorous would make 3 bonds leaving two left..but idk i think i just read wrong and rushed cuz obviusly phos got 3 valence

By Thunder77 (Thunder77) on Saturday, June 05, 2004 - 05:22 pm: Edit

Jma.. yeah, thats what i put too

Aoeguy, i dont remeb exactly. It said something about dense nonmetal i think?

By Aab123 (Aab123) on Saturday, June 05, 2004 - 05:22 pm: Edit

JMA- i got 3 too, and AsH3

first of all, just a kind of clear but annoying reason why i think my answer is right.
- i've seen a question in review book tests about good laboratory procedure, and they ask sometimes which isnt a good procedure - the answer is "not waiting to weigh a substance until it is cool"..i think this lab was a perfect application of that question

I agree with this ^, my teacher talks about it all the time.

By Aab123 (Aab123) on Saturday, June 05, 2004 - 05:22 pm: Edit

Dammit, I think I got like 14 wrong...I doubt ill over a 700.

By Jma (Jma) on Saturday, June 05, 2004 - 05:23 pm: Edit

I left the question on KCL03 blank but I remember reading in the question that the substance was cooled before being weighed.

By Scion (Scion) on Saturday, June 05, 2004 - 05:24 pm: Edit

"How many unpaired electrons are there in phosphorous (I think).

I put 3 since there were three p electrons each of which would be alone in a p orbital."

shouldnt it be 1 unpaired? cuz phosphorous has 15 electrons, so 1s2 2s2 2p6 3s2 3p3

in the 3p orbital, 2 of the electrons make a pair, and the other one is lonely

yeah and screw the KNO3 one

By Aoe2guy (Aoe2guy) on Saturday, June 05, 2004 - 05:25 pm: Edit

Does anyone remember the full question for this thing with being dense? Also if anyone can just tell me what elements were in that matching list so i can try to remember the set.

By Aab123 (Aab123) on Saturday, June 05, 2004 - 05:25 pm: Edit

Right, but obviously it wasn't cooled properly if it were cooled again and it went lower. I'm pretty sure my chem teacher has talked abou tthis several times before.

Also, why is buret wrong, for the best equipmetn question

By Thunder77 (Thunder77) on Saturday, June 05, 2004 - 05:26 pm: Edit

yeah i know about the heat factor

But I just didnt think it would be applicable in this case since the change was so significant and there was a better answer

Can Somebody Please Clarify for Us please? :)

By Aoe2guy (Aoe2guy) on Saturday, June 05, 2004 - 05:27 pm: Edit

Aab - even if you did get 14 wrong, you're above a 700. actually, 14x would be a 750 according to this table in the real sat2s book.

By Athlonmj (Athlonmj) on Saturday, June 05, 2004 - 05:28 pm: Edit

scion, 3 unpaired. according to hunds rule, electrons try to stay unpaired as long as possible, the 3 electrons will fill up the empty p orbitals first, and since there are 3 orbitals = 3 unpaired electrons

By Aoe2guy (Aoe2guy) on Saturday, June 05, 2004 - 05:30 pm: Edit

for why its not a burette - 1) this is a weak reason but burettes are normally associated with titrations 2) if you've used a burette, its kinda hard to get a perfect volume of something out when you turn that knob thing - stuff still drops. volumetric flasks are known for their ability to create standard solutions (that is, a soln with a known concentration)

By Thunder77 (Thunder77) on Saturday, June 05, 2004 - 05:30 pm: Edit

Aoeguy, you sure?
That would be really nice!

Anyway, buret is wrong because you only use it to add a certain amount of liquid to something. You want 1 liter IN TOTAL including with the solute dissolved in it. You have no way of knowing exactly how much to add.

With a volumetric flask, you first put in solute. Then you add in the solvent until you reach the 1 L line. Well, as least thats what i thought.

Anyone care to confirm or clarify?

By Vp4t3l (Vp4t3l) on Saturday, June 05, 2004 - 05:32 pm: Edit

2 gases in 2 containers. one of the gases is oxygen and the other one is something else.

i dont remember exactly, but it said something about oxygen being twice the amount or something

i put A) CH4 since its MM is half of O2 (16)

By Jma (Jma) on Saturday, June 05, 2004 - 05:32 pm: Edit

According to Hund's law, electrons will fill empty orbitals before pairing. THus, each of the three p electrons would enter separate orbitals.

For the question where hte elecron was emitted, the answer was beta decay correct. I think this is correct since an electron was emitted and atomic number increased by one.

Also for the organic question with the double bond and two carbons, were there four hydrogens. I assumed that the element would be ethene or C2H4.

For the Sn+4,
I put 50 protons, 67 neutrons, and 46 electrons.

By Jma (Jma) on Saturday, June 05, 2004 - 05:35 pm: Edit

Yes, also put CH4. O2 = 32, and CH4 = 16. THus, this is exactly one half of the oxygen.

By Thunder77 (Thunder77) on Saturday, June 05, 2004 - 05:38 pm: Edit

Yeah Jma,

I can confirm all your answers are correct. A beta particle is a electron by the way, and they even show you that an electron is emitted. So that is def. correct.

C2H4 is correct as well. Just draw a double bonded Carbon=Carbon like this. Then add H to each carbon until each C has exactly four bonds. You will get 4 H.

See you guys later

By Jma (Jma) on Saturday, June 05, 2004 - 05:42 pm: Edit

What was the question where there were two times as many protons 30 vs. 15 or something to that effect?

Also, for the density question: did it say nonmetal or metal?

By Scion (Scion) on Saturday, June 05, 2004 - 05:46 pm: Edit

MY BAD:DAMN HUND

By Pianolover25 (Pianolover25) on Saturday, June 05, 2004 - 05:50 pm: Edit

which was the reducing agent?

By Scion (Scion) on Saturday, June 05, 2004 - 05:55 pm: Edit

SO, what was the volume one: nucleus or electrons?

By Athlonmj (Athlonmj) on Saturday, June 05, 2004 - 05:55 pm: Edit

F2

By Pianolover25 (Pianolover25) on Saturday, June 05, 2004 - 05:56 pm: Edit

How could it be F2?

By Aab123 (Aab123) on Saturday, June 05, 2004 - 05:57 pm: Edit

electrons I guess

BTW, I skipped three...with 14 wrong what is that looking like, 710?

By Jma (Jma) on Saturday, June 05, 2004 - 05:58 pm: Edit

I think I put F2 but it might have been another answer. My reasoning is that many elements form compounds with F2 in this reaction:

2X + F2 =(produces) 2X(+1)F(1)

Once again, does anyone know if it was a metal or nonmetal for density with lead and the other substances.

By Jma (Jma) on Saturday, June 05, 2004 - 05:58 pm: Edit

I think I put F2 but it might have been another answer. My reasoning is that many elements form compounds with F2 in this reaction:

2X + F2 =(produces) 2X(+1)F(1)

Once again, does anyone know if it was a metal or nonmetal for density with lead and the other substances.

By Pianolover25 (Pianolover25) on Saturday, June 05, 2004 - 05:59 pm: Edit

I think it was density of lead, but for the reducing agent I put HCl

By Thunder77 (Thunder77) on Saturday, June 05, 2004 - 05:59 pm: Edit

nonmetal

I put lead and if it said metal i dont think i would put Lead as the answer if it said metal

By Jma (Jma) on Saturday, June 05, 2004 - 06:04 pm: Edit

I put lead as well. I thought lead was a metal, (I do not know why, but I always assumed that it was) but I guess it worked out for the best if I misread this one.

By Aab123 (Aab123) on Saturday, June 05, 2004 - 06:06 pm: Edit

Does anyone remember the whole question for the one with lead that you guys are talking about?

By Thunder77 (Thunder77) on Saturday, June 05, 2004 - 06:07 pm: Edit

Can people post more quesions to be discussed?

I will check back later tonight and see if my answers are correct.
Have Fun! :)

By Joshjmgs (Joshjmgs) on Saturday, June 05, 2004 - 06:11 pm: Edit

Someone posted this a while ago:

Which substance will form a strong acidic solution when it reacts with water.

A. LiF
B. NH3
C SO3

Wouldnt it be B and C
S03 +HOH-> H2SO4 + OH-
and NH3 + HOH -> H+(strong acid) NH4+ (weak base)
Weak base + strong acid means an acidic solution, but HOW strong is considered strong?

And, when you take the test (i am tomorrow), do you put all of your chemistry questions in the third section? (with the True and False columns)
I am taking IIc, Chem, and then physics, so do I fill them in in that order?

By Tsunashima1 (Tsunashima1) on Saturday, June 05, 2004 - 06:18 pm: Edit

Wait a second everyone, shouldn't the mass-volume graph for water be a straight line upwards?

At constant temp, density is constant, so mass/volume = k, giving mass = k*volume, which is a ray with positive slope, extending from the origin. Or did I miss something?

By Aab123 (Aab123) on Saturday, June 05, 2004 - 06:19 pm: Edit

H+ is not a strong acid.

Its just H2SO4

By Vermicelli (Vermicelli) on Saturday, June 05, 2004 - 06:21 pm: Edit

SO3 in water produces acidic solution because:

SO3 + H2O -> H2SO4

Electrons make up the most of an atom's VOLUME

By Tsunashima1 (Tsunashima1) on Saturday, June 05, 2004 - 06:21 pm: Edit

By the way, I put down lead twice: metal and positive oxidation state. Was this right?

By Thunder77 (Thunder77) on Saturday, June 05, 2004 - 11:30 pm: Edit

Ne more questions?

By Succor101 (Succor101) on Saturday, June 05, 2004 - 11:31 pm: Edit

...can't remember...memory fades...quickly...

By Aoe2guy (Aoe2guy) on Saturday, June 05, 2004 - 11:39 pm: Edit

Which question set was Pb in? What other questions were in this matching set, and what other answer choices were in the set? Also, what's this question with the most dense something..

By Jma (Jma) on Saturday, June 05, 2004 - 11:47 pm: Edit

Here are some more questions:

Lithium had no P orbital electrons and Lithium had the smallest ionic radius?

Also, I put Cesium for lowest first ionization energy.

By Thunder77 (Thunder77) on Saturday, June 05, 2004 - 11:54 pm: Edit

Yah confirmed Cs is lowest IE and smallest ionic radius

What were soem of the other harder or ambiguous questions?

During the test I got really nervous. I usually finish the first 1-20 and T/F in 15 mins but it took me 22 minutes today. I panicked and I picked up my pace. At the end I used 15 minutes to check all my work again.

By Thunder77 (Thunder77) on Sunday, June 06, 2004 - 12:27 am: Edit

I see that this thread is officially dead at 203 posts.
Oh well

By Scion (Scion) on Sunday, June 06, 2004 - 12:29 am: Edit

"Yah confirmed Cs is lowest IE and smallest ionic radius"

isnt Li smallest ionic radius?

and JMA and anyone else whos good ata chem, how many T/T/CEs?

By Thunder77 (Thunder77) on Sunday, June 06, 2004 - 12:35 am: Edit

Actually you're right. Srry :)
Li does have smaller ionic radius.

There were about 3-4 TT CEs

By Esotericstorm (Esotericstorm) on Sunday, June 06, 2004 - 01:00 am: Edit

I got 5 TT CEs, 3 of which were in a row...

Did anybody figure out what the yellow-green gas was? Chlorine or sulfur?

By Thunder77 (Thunder77) on Sunday, June 06, 2004 - 01:02 am: Edit

chlorine

Sulfur is not a gas and chlorine is def yellow-green

By Whightknight (Whightknight) on Sunday, June 06, 2004 - 01:07 am: Edit

The first two of the t/f were F/F for sure. There were also 3 TTCEs, 2 of which were consecutive towards the 2nd half of the t/f questions. The nucleus would take up most of the volume. Protons and Neutrons are much much more larger than electrons. If it had said electron cloud that would be correct; however protons+nuetrons >>> electrons interms of actually size (volume). Yes Pb was the answer to 2 questions and Li was the answer to 2 questions also. SO2 is the one that produces the strong acid. Mg(OH)2 would neutralize, and Iron from Iron ore would be reduction. The other answers to other various questions above seem correct.

By Thunder77 (Thunder77) on Sunday, June 06, 2004 - 01:17 am: Edit

was nuclues one of the choice?

I thought the choices were neutron, proton, electron, and something else

By Thunder77 (Thunder77) on Sunday, June 06, 2004 - 01:20 am: Edit

Actually that question is quite ambiguous

Electron does take up most of the volume because of its orbitals. And I read that the nucleus is insignificant to the size of the atom.

So it really depends on exactly what the question was asking and what the choices were exactly

By Basketball2k79 (Basketball2k79) on Sunday, June 06, 2004 - 01:34 am: Edit

i dont get the PB density question floating around

but mass/volume=density should = straight line
KNO3 was right
uhhh Li smallest ionic CS lowest IE
i hope the scales actually around 6 or 7 i might get lucky if it is otherwise not

By Zik (Zik) on Sunday, June 06, 2004 - 03:23 am: Edit

i believe the question asked which of the following is responsible for the volume of an atom...so i put electrons.

and to settle those diagrams once and for all...

http://virtual.yosemite.cc.ca.us/webbg/Chem101/Ch10lecture/

scroll down, m/v is straight line, w/positive slope and p/v is a curve ...

By Tsunashima1 (Tsunashima1) on Sunday, June 06, 2004 - 09:36 am: Edit

I actually got 3 TT CE's in a row starting with the Hydrogen one... Did anyone get the same?

By Aoe2guy (Aoe2guy) on Sunday, June 06, 2004 - 10:05 am: Edit

********Does anyone know the other questions in the same set as the Pb density question? And does anyone know the exact Pb questions?

By Ecnerwalc (Ecnerwalc) on Sunday, June 06, 2004 - 10:13 am: Edit

"I actually got 3 TT CE's in a row starting with the Hydrogen one... Did anyone get the same?"
I actually did get three in a row. Don't know if it started with Hydrogen.

There is one question: Does weighing a sample while it is still hot affect the weight given on a scale? If so, how? Is it heavier or lighter when hot?

By Infinity (Infinity) on Sunday, June 06, 2004 - 10:21 am: Edit

Do you guys remember the T/F one with the number of nuetrons affecting the nuclear charge? That was False right? I thought the protons contributed...
Tsunashima, I agree with what u put. I thought the mass and volume on would be linear and (+).

Was the reducing agent F2 or LiF???

By Tsunashima1 (Tsunashima1) on Sunday, June 06, 2004 - 10:28 am: Edit

Yes, while it's still hot the weight seems lighter than it really is, at least on an electronic balance.

But that wasn't the answer to the KClO3 question, was it? I had the impression that the weight kept going down because the KClO3 wasn't completely decomposed after the first heating. If the true reason was that the stuff was still hot, you should still get roughly the same weight (precise but not accurate) after each weighing.

By Thunder77 (Thunder77) on Sunday, June 06, 2004 - 10:50 am: Edit

Was the questions asking for oxidizing or reducing agent?

I think I put HCl and I thought it was asking for the oxidizing agent.

By Athlonmj (Athlonmj) on Sunday, June 06, 2004 - 10:54 am: Edit

It was asking for oxidizing agent... so which one reduces the most, which would be F2... just look at your reduction potentials.

By Pianolover25 (Pianolover25) on Sunday, June 06, 2004 - 10:54 am: Edit

I think it also said oxidizing agent so I put HCl too

By Tsunashima1 (Tsunashima1) on Sunday, June 06, 2004 - 11:06 am: Edit

What did you guys put for the KClO3 one?

By Thunder77 (Thunder77) on Sunday, June 06, 2004 - 11:10 am: Edit

F is a very good oxidizing agent, but I'm not sure about F2 since it is a bonded molecule so it wouldn't be reduced easily

So I put HCl

Ca anybody confirm or clarify

By Newt (Newt) on Sunday, June 06, 2004 - 11:13 am: Edit

I put HCL too. As for the KCL03 one, I put 39% for one of the questions and "didn't let it cool long enough" for the other one.

By Athlonmj (Athlonmj) on Sunday, June 06, 2004 - 11:14 am: Edit

F2 + 2e- ---> 2F- +2.87

http://www.csudh.edu/oliver/chemdata/data-e.htm

F2 has the strongest reduction potential - thus strongest oxidizing agent.

By Jma (Jma) on Sunday, June 06, 2004 - 11:33 am: Edit

For the nuclear charge question, I think it was false false.
If I remember correctly, it was false that isotopes have the same number of neutrons and it was also false to say that neutrons determine nuclear charge. I might not be remembering the question correctly however.

By Aoe2guy (Aoe2guy) on Sunday, June 06, 2004 - 11:42 am: Edit

Do you guys remember one of the MC questions that went like this:
NH3 + H30+ ----->
Which are products of the reaction?
I. OH- (aq)
II. H20 (l)
III. NH4+
what did you put

By Krbxtigerz (Krbxtigerz) on Sunday, June 06, 2004 - 11:42 am: Edit

What do I need to get a 750 on chemistry test???
I don't want to retake it.......-.-

By Tsunashima1 (Tsunashima1) on Sunday, June 06, 2004 - 11:42 am: Edit

What did you guys put for why the KClO3 have differents weights after first and second heating?

By Tsunashima1 (Tsunashima1) on Sunday, June 06, 2004 - 11:44 am: Edit

Aoe2guy, I put II and III for that one. That reaction is just the reverse Ka reaction of NH4+

By Thunder77 (Thunder77) on Sunday, June 06, 2004 - 11:54 am: Edit

For the KClO3 having different weights

I put there were still some KClO3 left as the reason
thought that more O2 had evaporated the first time it was heated. Thus the most significant drop in mass was in the first time.

Later, since there are only very O2 left in the compound, additional heating would cause what little O2 is left to evaporte, thus causing the lower decrease in mass.

...
Some say that it was the heat factor, but im not sure. Heat does have an impact, but Im not sure if the question said whether the compund was cooled or not before weighting. also, I dont think the heat factor would have caused such a significant difference

By Newt (Newt) on Sunday, June 06, 2004 - 12:08 pm: Edit

Aoe2guy, I put II and III

By Thunder77 (Thunder77) on Sunday, June 06, 2004 - 12:10 pm: Edit

I put I, II, and III.

By Athlonmj (Athlonmj) on Sunday, June 06, 2004 - 12:14 pm: Edit

I put II and III

By Basketball2k79 (Basketball2k79) on Sunday, June 06, 2004 - 12:19 pm: Edit

no its gotta be II and III Aoe2guy defintely no OH-, keep posting questions up guys

By Tsunashima1 (Tsunashima1) on Sunday, June 06, 2004 - 12:20 pm: Edit

Um, I still don't see why cooling is the answer for KClO3...

If that's true, then why is the weight of the third weighing used to calculate the 39% oxygen question? How do you know that the figure obtained in the third weighing wasn't skewed from improper cooling also, just as you claim with the second heating

By Basketball2k79 (Basketball2k79) on Sunday, June 06, 2004 - 12:26 pm: Edit

when we do labs in class teacher defintely tells us too heat something..cool it..weigh it..and do it all again to make sure we evaporate everything out so thats why i put that not all the O2 was taken from KClO3

By Aoe2guy (Aoe2guy) on Sunday, June 06, 2004 - 12:38 pm: Edit

yeah i put II and III also, i was just checking to make sure i didnt read the reactants wrong

By Jma (Jma) on Sunday, June 06, 2004 - 12:38 pm: Edit

Moving on to a different question,

For the question about endothermic reactions, was the answer that the products had greater energy content then the reactants?

By Thunder77 (Thunder77) on Sunday, June 06, 2004 - 12:41 pm: Edit

Why can't there be OH in there too?

In all water solutions, there has to be some OH- no matter how little, and there has to be some H3O+ as well, no matter how little, right?

For the KClO3 question,

First of all, I know that heat affects the weight, but I do not know if it will cause chanegs that are as significant as show in the data.

Also, I had a different reasoning,
When the KClO3 was first heated, most of the O2 evaported. This always happens right? Most of the stuff evaporate initially but there are still some stuff left in it. Therefore, after heating it the second time, more of the O2 evaported, thus causing the decrease in mass. And finally we heat it the third time to ensure everything is gone from it. The reason what there was a difference bet. the first and second recordings of the mass was because not of the O2 evaported the first time, thus there were still some KClO3 left in it. At least thats how I thought ot it.

By Aoe2guy (Aoe2guy) on Sunday, June 06, 2004 - 12:46 pm: Edit

Jma- yes

Thunder - OH- wasn't a product of that specific reaction.

By Scion (Scion) on Sunday, June 06, 2004 - 12:50 pm: Edit

so can we try to get a consensus on the KCl03 one?

and were there any T/T/CE's in the second column?

By Aoe2guy (Aoe2guy) on Sunday, June 06, 2004 - 12:50 pm: Edit

Thunder- what you're saying doesn't explain why there was a greater loss in mass the first time. With the same exact reasoning you just said, all it tells me is that the mass each successive time was less - it doesn't explain why so much more was lost the first time. In other words, there was still KCl03 left, but that doesn't mean it had to lose so much more the first time.

By Newt (Newt) on Sunday, June 06, 2004 - 01:11 pm: Edit

Listen people, there are two parts for the KCLO3 problem. In the question, it said that there were like 3 trials. Only in the FIRST TRIAL was it not fully cooled. It was cooled for the other 2 trials. Therefore, you could still get the answer of 39% by using that data, AND get the answer "was not cooled enough" for the other question. This is because the question with the answer "was not cooled enough" only asked about that first trial (if my memory serves me correctly).

Also, towards the end of the experiment, the data loss leveled off, so all the O was gone by then.

By Jma (Jma) on Sunday, June 06, 2004 - 01:16 pm: Edit

Does anyone remember the question where it had something to do witht there being twice as many protons in one atom as in another. I think it was involving elements with 15 and 30 protons.

What did you guys get for the questions with reaction mechanism, rate determining step and other reaction words.

By Jma (Jma) on Sunday, June 06, 2004 - 01:25 pm: Edit

I put rate determining step for the one about the slowest step in the reaction.

I think I put reaction mechanism for the question about all of the steps.

By Pianolover25 (Pianolover25) on Sunday, June 06, 2004 - 01:39 pm: Edit

That's what I put too Jma, does anyone remember any other questions?

By Satchamp (Satchamp) on Sunday, June 06, 2004 - 01:48 pm: Edit

aite.......so which questions arent u ppl sure about??? someone compile them all.....plz

By Basketball2k79 (Basketball2k79) on Sunday, June 06, 2004 - 02:00 pm: Edit

yeah what was that quiestion with the H+ and giving of visiblie light or something...

By Jma (Jma) on Sunday, June 06, 2004 - 02:03 pm: Edit

H+ only gives off certain wave lengths because energy levels are quantized. (Something to that effect) I do not remember the exact question but I think I put T/T/CE.

By Jma (Jma) on Sunday, June 06, 2004 - 02:04 pm: Edit

H only gives off certain wave lengths because energy levels are quantized. (Something to that effect) I do not remember the exact question but I think I put T/T/CE.

By Pianolover25 (Pianolover25) on Sunday, June 06, 2004 - 02:06 pm: Edit

how could that question be T/T/CE because the question said that hydrogen absorbed the wavelengths not gave them off.

By Jma (Jma) on Sunday, June 06, 2004 - 02:12 pm: Edit

I thought that it said that Hydrogen absorbed certain amounts of energy.

By Satchamp (Satchamp) on Sunday, June 06, 2004 - 02:13 pm: Edit

i put TT CE too

By Basketball2k79 (Basketball2k79) on Sunday, June 06, 2004 - 02:16 pm: Edit

what about the visible light something about hydrogen emitting or absorbing visiblie light..but visible light is an extremely small part of the electromagnetic spectrum so i think i put F,F or something or F,T i dont remember the question exactly anyone remember?

By Basketball2k79 (Basketball2k79) on Sunday, June 06, 2004 - 02:16 pm: Edit

what about the visible light something about hydrogen emitting or absorbing visiblie light..but visible light is an extremely small part of the electromagnetic spectrum so i think i put F,F or something or F,T i dont remember the question exactly anyone remember?

By Thunder77 (Thunder77) on Sunday, June 06, 2004 - 02:18 pm: Edit

What specifically was the KClO3 question asking?

i forgot

By Scion (Scion) on Sunday, June 06, 2004 - 02:32 pm: Edit

anymore T/T/CE's?

By Basketball2k79 (Basketball2k79) on Sunday, June 06, 2004 - 03:17 pm: Edit

i dont rememberr specific questions anymore threads dying laTer guys

By Basketball2k79 (Basketball2k79) on Sunday, June 06, 2004 - 03:17 pm: Edit

i dont rememberr specific questions anymore threads dying laTer guys

By Ecnerwalc (Ecnerwalc) on Sunday, June 06, 2004 - 04:20 pm: Edit

Um, about the cooling issue on KClO3, does anyone know how the ANSWER was worded? It didn't have the word "cool" in it anywhere did it? Or did it say something like,"it was hot"?

By Pianolover25 (Pianolover25) on Sunday, June 06, 2004 - 06:01 pm: Edit

anyone remember any more questions?

By Joshjmgs (Joshjmgs) on Sunday, June 06, 2004 - 06:37 pm: Edit

I took the SAT II Chemistry today and i finished it in a half hour!!!
It was so easy, i did the entire test twice and im wholy satisfied.
Accept there was a True false that i wasnt sure about
"When ice melts it releases energy to its surroundings"
or something to that extent
I put false, because it doesnt seem right..

By Ecnerwalc (Ecnerwalc) on Sunday, June 06, 2004 - 07:35 pm: Edit

yeah, it gains energy from its surroundings...

By Jma (Jma) on Sunday, June 06, 2004 - 07:55 pm: Edit

Again, I think CCL4 was the tetrahedral compound. (THis might be from a practice)

Also, was there a question on which bond was most polar?

If so, I put HF. The choices were HCL, HF, and others. (This might be from a practice test).

By Newt (Newt) on Sunday, June 06, 2004 - 08:03 pm: Edit

Yeah, CCL4 was tetrahedral and HF is the most polar.

By Thunder77 (Thunder77) on Sunday, June 06, 2004 - 08:09 pm: Edit

ok.. i think i remeber the KClO3 question now

It was like..
Why was there still a change in mass from the second to third heating after the first heating

I thought it was heat too but then I though if it was then it would have affected all three heating anyway.

Did the question actually say ask why there was a difference between the changes from first to second, and from second to third?

By Scion (Scion) on Sunday, June 06, 2004 - 08:54 pm: Edit

can someone compile a list of right answers?

By Tallyrand (Tallyrand) on Sunday, June 06, 2004 - 10:40 pm: Edit

Eh. The only one so far that I have to dispute is HF being more polar than HI. Isn't HI more polar? (I have a feeling I'm wrong, but let's confirm) Also, what's up with the KClO3 question? Have we reached a consensus on that? I thought it was because some KCLO3 still remained...

By Aab123 (Aab123) on Sunday, June 06, 2004 - 10:49 pm: Edit

I also said HF is most polar, it has the biggest electronegativity difference. H is 2.1 and F is 4.0. Whereas I is 2.5.

By Scion (Scion) on Sunday, June 06, 2004 - 11:53 pm: Edit

anyone up to making a correct answers list?

By Protokurios (Protokurios) on Monday, June 07, 2004 - 12:46 am: Edit

I skipped the question concerning the balancing of an equation that had Al + Ag+ --> [blank]. It asked what was the coefficient of Ag+ after the reaction was balanced. I was thinking maybe it's 1 because I can't think of any reaction that could take place, even oxidation-reduction, which I don't know too much about anyways. So I skipped it, thinking there was something extra I didn't know about. What did you guys put?

By Athlonmj (Athlonmj) on Monday, June 07, 2004 - 12:54 am: Edit

I put 3 - because Al oxidizes to Al+3

By Pianolover25 (Pianolover25) on Monday, June 07, 2004 - 01:36 am: Edit

That's what I put too

By Protokurios (Protokurios) on Monday, June 07, 2004 - 02:18 am: Edit

Such an easy answer, if only I knew Al would oxidize to Al3+. Thanks.

By Aoe2guy (Aoe2guy) on Monday, June 07, 2004 - 03:23 pm: Edit

Does anyone remember the last question on the entire test?

By Krbxtigerz (Krbxtigerz) on Monday, June 07, 2004 - 03:32 pm: Edit

so for the Al + Ag+ question .... how is the answer 3?? isn't it 1 because only thing that changes is the oxidation number....??

By Aoe2guy (Aoe2guy) on Monday, June 07, 2004 - 03:37 pm: Edit

anyone know the last question? it was the one right after that Ag+ + Al ---> question.

By Vermicelli (Vermicelli) on Monday, June 07, 2004 - 05:11 pm: Edit

Al + Ag+ ->

The question was what was the coefficient of the Ag+ to balance the equation, which is 3.

Al + 3Ag+ --> Al+3 + 3Ag

By Infinity (Infinity) on Monday, June 07, 2004 - 07:37 pm: Edit

omg i must have been tired...I saw it as Ag + Ag+=>

By Thunder77 (Thunder77) on Monday, June 07, 2004 - 07:38 pm: Edit

Can we have a discussion of the KClO3 question?
It would be great if somebody has a source to back up their answers.

Also, here's another one's that's bugging me
Is one of the T/F questions. First statement says that hydrogen only absorb only certain spectrums of light. Second statement says that orbitals are quantized. I put T T CE for this one. However, the statement says "absorb" and not "emit"(spectrography) certain spectrums of light. I figured that the light that when we see "emitted" from the hydrogen atoms when it electrons goes from exicted to ground state, we are only seeing what light wasnt absorbed and what was reflected back. Therefore I choose T T CE for the question. What do you guys think?

By Jma (Jma) on Monday, June 07, 2004 - 07:50 pm: Edit

Interesting point THunder. To quote "Chemistry Prentice Hall, The Study of Matter" (my textbook), "under certain conditions, atoms ABSORB and give off LIGHT ENERGY and other kinds of electromagnetic radiation." From this statement, I would have to assume that the correct answer is T T CE though I am not sure.
I put T T CE however.

By Jma (Jma) on Monday, June 07, 2004 - 07:52 pm: Edit

Lets keep this alive, somebody has to remember a few more questions.

By Aab123 (Aab123) on Monday, June 07, 2004 - 08:36 pm: Edit

Ugh, man I just wanna forget about this. It's over, and there's not much we can do now.

By Krbxtigerz (Krbxtigerz) on Monday, June 07, 2004 - 09:06 pm: Edit

same here....after i look at this post, i feel so depressed cuz i find out i get so many wrong answers.....

By Infinity (Infinity) on Monday, June 07, 2004 - 09:13 pm: Edit

Hey cheer up, this is the best phase of the neverending SAT cycle. Just relax for the two weeks we can.


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