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

Reply 900

TolleyJack

Bit ridiculous was the composition of the c3 exam. 26 1 mark questions! 26!

Reply 901

Tuffyandtab

16

My predictions for grade boundaries for an a*
B2 - 43
B3 - 45
C2 - 47
C3 - 44

Reply 902

Terrydaktal

2

Original post by RotomGuy

You keep saying that, but our teacher and my revision guide have never said alumina once. I think any of Alumina, Aluminium Oxide or Bauxite will net you the mark.

well, i put bauxite :c

Reply 903

lewiswallis

2

pheW!!!!

Original post by t.thompson22

Technically your answer is correct, metal oxides and metal hydroxides dissolve in water. Therefore they are soluble compounds which are alkalis!
They neutralise with acids.

Acid + Metal Oxide ->> Salt + Water

Original post by t.thompson22

Technically your answer is correct, metal oxides and metal hydroxides dissolve in water. Therefore they are soluble compounds which are alkalis!
They neutralise with acids.

Acid + Metal Oxide ->> Salt + Water

Original post by t.thompson22

Technically your answer is correct, metal oxides and metal hydroxides dissolve in water. Therefore they are soluble compounds which are alkalis!
They neutralise with acids.

Acid + Metal Oxide ->> Salt + Water

Reply 904

Tuffyandtab

16

Original post by neil20143

For Metal Oxide I wrote base?

So did i

Reply 905

kwstudent

2

Original post by iPatr0nus

Omg I put Pb3O2 by accident I am such an idiot

If u showed ur working out ull get sum marks anyway it was a 4 marker soo mebe three?!

Reply 906

t.thompson22

2

Original post by Hxzel

For the ions question I wrote the ions so like I wrote Fe+2 instead of Iron (II) will that matter?

And are metal oxides bases or alkalis? I
Put base?

Posted from TSR Mobile

I think examiners will accept Fe2+

Metal oxides dissolve in water and neutralise acid in neutralisation reactions. Therefore they're soluble and they're alkalis. But bases will still net you the mark (:

Reply 907

MyNameIsNotJeff

6

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 said, Method 1 was a precipitation reaction and Method 2 was a titration reaction. Also, in Method 1, some of the product is lost through filtration as it is left in the filtration paper and it is less accurate because you don't know how much of the reactants were being used. Method 2 was more accurate because you knew the concentration and volume of the reactants but you had to make sure that the solution was neutral otherwise it would not be an accurate calculation.

Reply 908

PawanAviator

7

Original post by neil20143

I'd say Grade Boundaries would be slightly lower than last year for both:
Unit 2 : 46/60 A*
Unit 3: 44/60 A*

The problem with Unit 3 was that some of the questions were either know it or not.

Did anyone else get Sulfuric Acid as the catalyst to make Ethyl Ethanoate?

yep , correct! :biggrin:

Reply 909

PawanAviator

7

Original post by neil20143

I'd say Grade Boundaries would be slightly lower than last year for both:
Unit 2 : 46/60 A*
Unit 3: 44/60 A*

The problem with Unit 3 was that some of the questions were either know it or not.

Did anyone else get Sulfuric Acid as the catalyst to make Ethyl Ethanoate?

yep , correct! :biggrin:

i did.

Reply 910

rumana101

12

Original post by Tuffyandtab

So did i

Original post by neil20143

For Metal Oxide I wrote base?

so did i

Reply 911

emileepifanoff

1

Original post by neil20143

I'd say Grade Boundaries would be slightly lower than last year for both:
Unit 2 : 46/60 A*
Unit 3: 44/60 A*

The problem with Unit 3 was that some of the questions were either know it or not.

Did anyone else get Sulfuric Acid as the catalyst to make Ethyl Ethanoate?

I got the ethyl ethanoate part but not the sulfuric acid.

Did you understand the question which asked how a catalyst works? I didn't have a clue!

I think it was worth 2 marks (Can't really remember).

Reply 912

AmyRevises

3

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 :/

Reply 913

anna096

1

For the filling in the blanks question I put moles then 12C. Will I still get the marks?

Reply 914

neil20143

OP

4

Original post by emileepifanoff

I got the ethyl ethanoate part but not the sulfuric acid.

Did you understand the question which asked how a catalyst works? I didn't have a clue!

I think it was worth 2 marks (Can't really remember).

It lowers the activation energy but I completely forgot about it at the time, so I just made something up :P

Reply 915

11Jason11

4

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

Reply 916

rumana101

12

Original post by emileepifanoff

I got the ethyl ethanoate part but not the sulfuric acid.

Did you understand the question which asked how a catalyst works? I didn't have a clue!

I think it was worth 2 marks (Can't really remember).

would you get 2 marks for saying lowers the activation energy or would you have to same something else as well

Reply 917

lewiswallis

2

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

Reply 918

rumana101

12

Original post by 11Jason11

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

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

Reply 919

iPatr0nus

1

Omg I put Pb3O2 by accident I'm such an idiot

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

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