AQA GCSE Chemistry Unit 2 24 May 2012

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Reply 180

kman123456

Wow, i did 2/28= Ans x 34 = 2.42857.... And i wrote 2.42 as my answer not 2.43... Would i get the full 3 marks?

Reply 181

Blue_Clover

Original post by xoxlovelifexox

are you not happy with how it went?

Not at all! I pretty much wrote electrolysis for every question I didn't know the answer to (practically half the exam -_-). How was yours? :biggrin:

Reply 182

AkhiMohamed

Original post by kkkkkatie

for the question that was like 'why if the temp is increased does the yield decrease?' was the answer because the reaction is exothermic

Yes it was because the highest yield is when the temp is low

Reply 183

AkhiMohamed

Original post by kILLERm

This is my guess...

A*= 38
A = 35
B = 29
C = 23

I can't see them being extremely low. Mainly due to the fact that it wasn't very difficult. I believe it's a goodbye to 100ums.

All june exams for chem have 32 A*.

Reply 184

HopelessTurtle

Original post by ryazd

it was not 2.43

it was 4.85g

you have to divide 2 by 14 then times it by 2 because of the molar ratio

then you multiplied that by 17

What you did wrong was that 17 is ammonie, there were two molecules of ammonie so you would times it by 34 not 17. I think. The answer is 2.43.

Reply 185

HopelessTurtle

Original post by kman123456

Wow, i did 2/28= Ans x 34 = 2.42857.... And i wrote 2.42 as my answer not 2.43... Would i get the full 3 marks?

Yeah you will. Dont worry.

Reply 186

Xiomara

Original post by tssf_skye

has anyone got the unoffical mark scheme/predicted grade boundaries? i know it's probably somewhere on this thread but i can't seem to find it

Seconded! (for my sister...haha!)

Reply 187

saq96

The question about why manufacturers do not increase pressure....

i wrote that it is a compromise between yield and the rate of reaction...if this right?

Reply 188

Matt0496

I actually found this exam really hard and I've been getting about 40/45 in the mocks, but I know I've lost about 10 already in this. We need to get an unofficial mark scheme going :u:

Reply 189

Joeldamole

Original post by AkhiMohamed

All june exams for chem have 32 A*.

Yeah, people are talking about other C2 exams that were of the same standard, yet 38 was an A*... but these exams were sat by the triple science classes... so the grade boundaries will be harsher as they are better at science (generally)

Reply 190

Matt0496

Original post by Joeldamole

but these exams were sat by the triple science classes (genrally)

No? I'm additional science and I did it

Reply 191

A193

Original post by kkkkkatie

Yes i'm so happy i wrote 2.43 for the ammonia!!!!!!!!!!11

Would they accept 2.4 ?????????????????????

Reply 192

Zeionic

Original post by Matt0496

I actually found this exam really hard and I've been getting about 40/45 in the mocks, but I know I've lost about 10 already in this. We need to get an unofficial mark scheme going :u:

SAME!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! ;(

Reply 193

Zeionic

pm me your answers + questions if u know / question number and i make a mark scheme!!!!!!!!!!!!!!!!!!!!

I will put Dedicated names if you do send me them!

(edited 11 years ago)

Reply 194

BBBT

Original post by A193

Would they accept 2.4 ?????????????????????

i put 2.4

Reply 195

maxtate

Original post by saq96

The question about why manufacturers do not increase pressure....

i wrote that it is a compromise between yield and the rate of reaction...if this right?

No thats temperature LOL u had to say cuz its more expensive/dangerous at higher pressure

Reply 196

khalidpatel

are WE GONNA HAVE A MARKSCHEME or not

Reply 197

maxtate

I want one too :frown:

Reply 198

Aidanb90

Original post by saq96

The question about why manufacturers do not increase pressure....

i wrote that it is a compromise between yield and the rate of reaction...if this right?

Its dangerous and costs a lot to maintain high pressures.

Reply 199

jesse111

[QUOTE="daniya12;37732182"]

Original post by Zahirajavaid

How can u make that solution to a solid?

you would evaporate it, to rid the water

The question was how do you turn a solution of something into a solid.

Evaporation/crystalisation is to get crystal like salt, they wanted condensed/cooled