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AQA Chemistry C3 - Unofficial Mark Scheme

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Reply 400

TheConfusedMedic

Original post by nisha.sri

@starstudent7 got 2 thousand ish too... 😯

oh, maybe I'm wrong then lol :redface:

Reply 401

Fr3dg

Original post by Youngey4

I sat the same paper but got a different question. One of the bonds formed was a triple bond between a carbon atom and an oxygen atom. And I got 212J for that question.

oh right! can you remember the question, or just the word equation?

Reply 402

Examslol

I got 3444 for the specific hear capacity one

What is 54/60?

Original post by Oblivion99

What is 54/60?

a solid A*

Reply 405

Account user

What is a ISA score of 44, C1: 45 C2:50 and C3:25 going to be?!!!! Anyone please help any predictions will do!! I need an A

Reply 406

Oblivion99

I reckon 53 and over for a* for every science.

Reply 407

jessgibson

Original post by Roquebrune2014

So did I is -1276 wrong?

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I don't know because it said on the next questioas an exothermic reaction but exothermic reactions are positive and so i am not too sure what the answer is

Reply 408

z1820

Original post by jessgibson

I don't know because it said on the next questioas an exothermic reaction but exothermic reactions are positive and so i am not too sure what the answer is

Exothermic reactions are negative

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Reply 409

chelseafc141

Original post by jessgibson

I don't know because it said on the next questioas an exothermic reaction but exothermic reactions are positive and so i am not too sure what the answer is

I'm sure exothermic is negative

Reply 410

jessgibson

Original post by z1820

Exothermic reactions are negative

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u sure because my teacher told me they were positive 5 mins before the exam

Reply 411

Aamna-

I did well on C1, C2 and my controlled assessment but C3 went pretty badly for me. Is it still possible to get an A* if one of the three exams wasn't as good as the others?

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Reply 412

z1820

Original post by jessgibson

u sure because my teacher told me they were positive 5 mins before the exam

Exothermic are always negative because they're releasing/losing heat energy

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Reply 413

AQAbio/business

Original post by Oblivion99

I reckon 53 and over for a* for every science.

No, i think around 48 will be

Reply 414

TheConfusedMedic

Original post by jessgibson

u sure because my teacher told me they were positive 5 mins before the exam

exothermic reactions give out energy to the surroundings, so the energy in the surroundings increases but the energy of the products/chemicals/whatever actually decreases :smile:

Reply 415

Aamna-

Original post by jessgibson

u sure because my teacher told me they were positive 5 mins before the exam

Exothermic reactions release energy. So, the overall energy change is negative - because it loses energy to its surroundings.

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Reply 416

Cakes717

Original post by Mahrez

51 a*

No way it's Chem 3 the boundaries for A* are always lower than Chem 1 and 2

Reply 417

Cakes717

For the question where it said why air can't be allowed in the reactor I put that the oxygen reacts with the substances in the reactor and so would cause an explosion...Is this right?

Reply 418

Dat1Guy

I did further additional Chemistry unit 3, what was the question on specific heat capacity? For the bond energy one i got +212? Was this the same paper?!