Chem Exam

[Isaac S]

Surely someones got answers for the mc?

[ActivationEnergy]

Might be just me but the delta T was 32.3-20 so I rounded it to 12 and got 35%. Would that be correct? (Considering that’s how significant figures work)

You are only supposed to round your final answer to the correct significant figures. So, given if 33% is the correct answer, i don’t think vcaa will accept 35% but i think you will get marks for your working out

[zoharreznik]

You are only supposed to round your final answer to the correct significant figures. So, given if 33% is the correct answer, i don’t think vcaa will accept 35% but i think you will get marks for your working out

ooooft hopefully 2/3 then. I must have mixed up the rules lol

[RingoAC]

Surely someones got answers for the mc?

DACDB
DBDBC
CDCAB
AACBB
CAADB
BACBC
These are my answers. quite UNSURE, especially for 10 and 28

[Isaac S]

DACDB
DBDBC
CDCAB
AACBB
CAADB
BACBC
These are my answers. quite UNSURE, especially for 10 and 28

Do you have a copy of the actual questions because I can't really remember them

[RingoAC]

Do you have a copy of the actual questions because I can't really remember them

https://mp.weixin.qq.com/s/e8WwrED428ZGyTiJisOLdQ
hopefully it can be opened
don't care about the answers they provided

[Isaac S]

https://mp.weixin.qq.com/s/e8WwrED428ZGyTiJisOLdQ
hopefully it can be opened
don't care about the answers they provided

SHouldn't question 19 be C?

[ActivationEnergy]

SHouldn't question 19 be C?

Yup. It should. I think some of their mcq are incorrect.

[99.95_goal]

https://mp.weixin.qq.com/s/e8WwrED428ZGyTiJisOLdQ
hopefully it can be opened
don't care about the answers they provided

Hi - thanks for posting the answers, however, is it just me or a few of the answers are kind of dodgy?

[RingoAC]

Hi - thanks for posting the answers, however, is it just me or a few of the answers are kind of dodgy?

I don't think they got all the answers correct as well so don't worry

[RingoAC]

SHouldn't question 19 be C?

oh that would be the other one that I was unsure about. I was thinking that the backward reaction had a greater instant change than the forward one, then gradually decreased until equilibrium

[1292]

and isnt 17 A?

[ActivationEnergy]

and isnt 17 A?

17 is most definitely A.

[keltingmeith]

I'm pretty sure the question asked which of the four would increase with a larger sample size. Uncertainty would decrease with a larger sample, so I don't think that was the correct option. The wording may be important. Reliability seems like the right one.

You're absolutely right - and looking at the question now, uncertainty cannot be right, because it MUST DECREASE if you increase sample size. I'm a little unsure if it would be reliability or precision looking at this, but I do agree, reliability seems slightly more correct.

---

I would like to go through the whole booklet and at least tell you all which MCQs I agree with, unfortunately I don't have that kind of time :S So instead, I'll keep an eye on this thread, and clarify any confusions of their answers and let people know if I agree with them and explain why they're right, or let you know if I think they're wrong as well. With that in mind:

and isnt 17 A?

Yeah, as AE said, 17 should be A. I'm guess they accidentally read volume as pressure, because an increase in pressure would have the exact same effect.

SHouldn't question 19 be C?

o boy, disagreements! I agree with the answer booklet.

Remember, the y-axis says rate, not concentration. It doesn't matter whether it says rate of forward reaction, or rate of backwards reaction - because at equilibrium, the rate of the forwards and backwards reactions are equal. So, if the rate has increased, and it's because of a temperature change, the temperature HAS to have gone up. In an exothermic reaction, increase temperature = shift to left, so the solution would get darker.

Thus, the answer to 19 is B, as indicated

[AR1472]

For question 6 I put B? the half cells for electrolytic threw me off