AQA GCSE Chemistry C2/C3 May 15th 2014

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Reply 200

MrSplashMan

Original post by BBeyond

The energy change question is 100% positive 486, check question 6a from the C3 spec paper.

Its exothermic so its a negative answer I think...

Reply 201

BBeyond

Original post by MrSplashMan

Its exothermic so its a negative answer I think...

Did you even read what I said?

Reply 202

S.Ahmad

Original post by BBeyond

The energy change question is 100% positive 486, check question 6a from the C3 spec paper.

Ohh, you can use my answers as an official
mark scheme, regardless of the negative, the mark will still be awarded as long as 486 is present in the answer box. My word is final.

Reply 203

jackster98

Original post by S.Ahmad

Oh don't worry laddy boy, I'm far more knowledgeable than AlphaNick, 0.2288 my good friend. AlphaNick is like swine feed on the bottom of my shoe.

Damn, I think I must have divided the wrong one- I did 0.2x 0.025 and then divided that answer by 0.286... will that get method marks do you reckon?

Reply 204

BBeyond

Original post by MrSplashMan

Its exothermic so its a negative answer I think...

Did you even read what I said?

Original post by S.Ahmad

Ohh, you can use my answers as an official
mark scheme, regardless of the negative, the mark will still be awarded as long as 486 is present in the answer box. My word is final.

My bad didn't know you were an examiner...

Reply 205

S.Ahmad

Original post by jackster98

Damn, I think I must have divided the wrong one- I did 0.2x 0.025 and then divided that answer by 0.286... will that get method marks do you reckon?

If substition is partially correct, you will be awarded a mark.

Reply 206

cheesidinosaur

for the mass question for c2, what was the answer? i got 4
most people got 2 :frown:

(((

Reply 207

yachts243

what is the answer to the hydogen fuel question and the lubricant one???

Reply 208

mickel_w

Original post by AlphaNick

1.2 * (40 / 24) = 2 tonnes

i also put 2. Does the working out gain any marks or do you get full marks if you get the correct answer? I made some mistakes in the working out, crossed a lot of things out because I realised I did something wrong.

Reply 209

yachts243

also what was the answer to the elctrolosyis one, negative electrode ( 3 marks

Reply 210

yachts243

surely hydrogen would be produced at the negatice electrode

Reply 211

cheesidinosaur

Original post by AlphaNick

1.2 * (40 / 24) = 2 tonnes

oh lord! well i times 40 by 2. but i still did the same method. how many marks was it again?

Reply 212

S.Ahmad

Original post by mickel_w

If I'm correct, the question was out of 3. One mark is awarded for the answer and two for the substitution.

Reply 213

WriterOfWrongs

What will grade boundaries be we reckon?

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Reply 214

BBeyond

Original post by WriterOfWrongs

What will grade boundaries be we reckon?

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Both papers around the 50 mark for an A* I would say

Reply 215

WriterOfWrongs

Original post by BBeyond

Both papers around the 50 mark for an A* I would say

Blummin ell. I thought the papers were easy but I think I got a lot wrong. Like there were some 4 mark questions that I had something to say but not enough for 4 marks

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Reply 216

PS4

Haha alpha nick calming to be the best then says zinc was produced at the negative electrode. You deserve to do btec for that. It was hydrogen as zinc is more reactive so displaces it and reduction occurs at the cathode