AQA GCSE Chemistry - C2 & C3 (14th May 2015)

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Reply 920

11Jason11

I put concentrated acid (sulfuric acid) would I still get the marks?

Reply 921

neil20143

Original post by lewiswallis

also does anyone know if i will get the marks for writing different pressures on the polymer question???

That should be right as it is changing a reaction condition which is primarily what the questions asks for for one of the reasons. (They've asked it before)

Reply 922

Blueyy__

Original post by rumana101

yeah, I think they were looking for any named acids really cause any acid catalyst can be used in the process but sulphuric acid is the one mentioned in textbooks

i think acid on its own would be fine, CGP Textbook says "an acid catalyst (e.g. concentrated sulfuric acid)" - and the question wasn't linked specifically to ethyl ethanoate, was it? i thought it just said what catalyst is used in the production of esters (or something along that)

(edited 8 years ago)

Reply 923

maxjackson5

There was a question about writing a compound that contains silver ions. I wrote silver nitrate - is that correct?
The next question was something about a substance containing carbonate ions - I wrote zinc carbonate - will that get a mark?
I didn't really understand what the question was asking so I just guessed for both haha,

Reply 924

james12390087

Aren't metal oxides insoluble?

Reply 925

zak7399

Original post by Blueyy__

i wrote vinegar would i get a mark for that?

Reply 926

rumana101

Original post by AmyRevises

What question was the one about "Are metal oxides bases or alkalis?" in... like what were the other questions around it because I don't remember seeing that and starting to worry i missed a page :/

it was for the question on soluble substances with the table

Reply 927

jackthb

for the aluminum question, would bauxite suffice as to aluminum oxide?

Reply 928

Palette

Original post by Nomes24

Hahaha honestly I don't think anyone had a clue on that 5 marker. I said stuff like more accurate and sensitive for titration, however more expensive, require indicator, subjective as to when reaction finished, burette for example could be dangerous (sharp). Then method 1 I said less sensitive, easier, however more steps where human error could go wrong e.g. filtration, subjective as to when all solid has formed, stuff like that can't remember really!

One marker questions not a big deal, I did that I said boiling point decreases in halogens because iodine is a liquid for example.... how bloody stupid! I really should have re read my answer as I would've probably picked up on that XD I loved the ammonia questions, hopefully it will be two marks for both of us :smile:

You probably got all the marks for that titration question.

(I think I might have wrote something about the point of colour change being subjective too, but it might be my brain fooling myself...).

I can't remember all the ammonia questions. I wasn't concentrating fully in that paper. I remember writing something along the lines of, 'no, increasing temperature counteracted by increasing yield of Y restoring equilibrium'...

How well did you do overall in Biology and Chemistry, if you mind me asking?

P.S. I also think AQA was very vague on certain questions. Especially that ratio question in B2, and the overall energy increase question in C3.

Reply 929

neil20143

Original post by Blueyy__

No it was specifically asking for the catalyst used to react Ethanol and Ethanoic acid which would be Sulphuric Acid :frown:

but I think most people struggled with that.

Reply 930

Hannzz98

What did everyone put for the question where you had to tick either carbon dioxide, carbon monoxide, hydrogen and something else.. I can't remember the actual question 😁

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Reply 931

Blueyy__

Original post by zak7399

i wrote vinegar would i get a mark for that?

probably not

Reply 932

AmyRevises

Original post by kittensrcute

on the 5mark question in c3 where you had to evaluate the two methods what were points you could put? I had no understanding of method one and am so scared ive just lost all 5 marks :frown:

I basically put:
*method 1 takes longer because theres more stages and you have to filter off the stuff blah blah blah...
method 1 easier because method 2 have to add the acid slowly but method 1 you just add to excess
*method 1 cheaper equiptment- beaker etc. method 2 requires specialised equiptments like a buretter
*method two more accurate- can find out exactly how much acid neutralises whatever it was

I have no idea if this is right or if I lost 5 marks :frown:

I just made stuff up and tried to show I knew what titration was

Does anyone know if this is right? :/

Reply 933

james12390087

Aren't metal oxides insoluble?

Reply 934

AmyRevises

Original post by rumana101

it was for the question on soluble substances with the table

Phew thank you... i think I put alkali not sure...

Reply 935

Hannzz98

Original post by maxjackson5

I did not understand this question at all! I just copied the stuff from the boxes into the answer spaces 😂

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Reply 936

Blueyy__

Original post by neil20143

No it was specifically asking for the catalyst used to react Ethanol and Ethanoic acid which would be Sulphuric Acid :frown:

but I think most people struggled with that.

lets hope that they accept just "acid" :smile:

Reply 937

Palette

Original post by Hannzz98

What did everyone put for the question where you had to tick either carbon dioxide, carbon monoxide, hydrogen and something else.. I can't remember the actual question 😁

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