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

Original post by science_geeks

Anyone have an unofficial mark scheme? ��

C2 Additional

6 marker -

Add soap to burette
Put water in flask
Add soap frop byr drop till permanent lather formed
Record No. of drops taken

Group 2 better because group 1 would't work for permanent hard water/doesnt thermally decompose upon boiling so no point.Soap reacts with Hard water so group 2 better !

Let's all add answers to compile a final unofficial mark scheme

Reply 442

Original post by MrTechGamer

C2 Additional

6 marker -

Add soap to burette
Put water in flask
Add soap frop byr drop till permanent lather formed
Record No. of drops taken

Group 2 better because group 1 would't work for permanent hard water/doesnt thermally decompose upon boiling so no point.Soap reacts with Hard water so group 2 better !

Let's all add answers to compile a final unofficial mark scheme

wait , this is for C3 lol !

Reply 443

Both papers were pretty easy, especially the C2 one.

Reply 444

bananabrain12345

Original post by TheTruthTeller

Wat was the emperical formula

I got Pb2O3

Reply 445

kiwifruit99

8

Original post by TheTruthTeller

Wat was the emperical formula

I got pb 2
O 3

Posted from TSR Mobile

Reply 446

tombirchy

Original post by Kyou

Both papers were pretty easy, especially the C2 one.

What the hell was the five marker in c3

Reply 447

Original post by Kyou

Both papers were pretty easy, especially the C2 one.

Did I have to state the formulas of the ions for the flame test questions.

I wrote down like all the wordy bits such as Iron (II) and Iron (III) etc , is that ok do u think ?

Reply 448

rohanl98

Is Pb2O3 right?
The ratio was 1:1.5
So I timsed it by 2

Reply 449

Original post by TheTruthTeller

Wat was the emperical formula

Pb2O3

Reply 450

Original post by MrTechGamer

Did I have to state the formulas of the ions for the flame test questions.

I wrote down like all the wordy bits such as Iron (II) and Iron (III) etc , is that ok do u think ?

Yeah it's fine

Reply 451

bananabrain12345

Original post by Jonathanitb

I put for the improvement one putting a lid or 'bung' on the beaker to prevent some of the heat loss - does that sound acceptable?

Me too!!!

Reply 452

Original post by tombirchy

What the hell was the five marker in c3

That was the hardest question in C3 for me but it was still pretty easy. I put more accurate

Reply 453

Original post by Kyou

Yeah it's fine

If so thats fantastic , but are you sure , because one on of friends told me that the question asked specifically for the formulas sucjh as fe2+ or whatever it is on the data sheet ?

Reply 454

Bubblebex1

3

Original post by TheTruthTeller

Wat was the emperical formula

Well I did it wrong and then as soon as I handed my paper in I realised what I needed to do I was so annoyed

But the answer was Pb2O3

Reply 455

tombirchy

Grade boundaries will be slightly lower than last year as 2014 paper was piss. I think 43 for A* for c3 and 45 for A* for C2

Reply 456

bananabrain12345

Original post by Jules12345

Whats the ethical issue for iodine?!

I put about mass medication.

Reply 457

Bubblebex1

3

Original post by rohanl98

Is Pb2O3 right?
The ratio was 1:1.5
So I timsed it by 2

I got the same ratio but forgot to the last bit because I was such an idiot so. Do you think I will still get 3 out of the 4 marks because I got the ratio?

Reply 458

rohanl98

Original post by Bubblebex1

I got the same ratio but forgot to the last bit because I was such an idiot so. Do you think I will still get 3 out of the 4 marks because I got the ratio?

Yeah should be 3/4 if all steps are correct

Reply 459