If you're doing Foundation Triple, yes. DNA is part of the polymer topic which is triple only. But learning about condensation polymerisation and amino acids are HT only for Triple.

Reply 45

Anthos

14

Original post by Lucas6485

The question says: Suggest why the iron in test tube Z rusts faster than in tube W

Has anyone got any ideas?

Water and air increase rusting, I think. Could be why.

Reply 46

UnbelievablyEasy

12

Original post by Anthos

Water and air increase rusting, I think. Could be why.

Exactly. So surely the question is wrong or he has read it incorrectly, because W would rust faster than Z, with greater exposure to water and air?

Reply 47

Natan Ramos

3

Original post by Lucas6485

The question says: Suggest why the iron in test tube Z rusts faster than in tube W

Has anyone got any ideas?

Afaik it’s because the tin acts as a cathode and has a large surface area and the iron acts as an anode with a comparably smaller surface area which perpetuates and increases the rate of reaction/ of oxidation of the iron. It’s specifically something to do with the cathode(tin) accelerating the rate of reduction of oxygen. I highly doubt we’d ever be asked something like this it’d be very cruel

Reply 48

Lucas6485

11

Yeah that's the conclusion that I came to as well, it's from the textbook but I can't find any answers for it

Original post by Natan Ramos

Afaik it’s because the tin acts as a cathode and has a large surface area and the iron acts as an anode with a comparably smaller surface area which perpetuates and increases the rate of reaction/ of oxidation of the iron. It’s specifically something to do with the cathode(tin) accelerating the rate of reduction of oxygen. I highly doubt we’d ever be asked something like this it’d be very cruel

Reply 49

Anthos

14

Original post by Natan Ramos

Afaik it’s because the tin acts as a cathode and has a large surface area and the iron acts as an anode with a comparably smaller surface area which perpetuates and increases the rate of reaction/ of oxidation of the iron. It’s specifically something to do with the cathode(tin) accelerating the rate of reduction of oxygen. I highly doubt we’d ever be asked something like this it’d be very cruel

With AQA asking about A Level stuff in the exam, anything could happen - nothing's cruel anymore.

Reply 50

gemiini

6

What exam asked us A Level stuff?

Original post by Anthos

With AQA asking about A Level stuff in the exam, anything could happen - nothing's cruel anymore.

Reply 51

Anthos

14

Original post by gemiini

What exam asked us A Level stuff?

Biology - standard deviation. Even though it was explained in the question, I wouldn't have expected AQA to include A Level stuff.

Reply 52

gemiini

6

Oh that makes more sense now. Yeah, I didn't know that was A Level stuff but I was very confused to see that in there, since it wasn't included anywhere in the spec.

Original post by Anthos

Biology - standard deviation. Even though it was explained in the question, I wouldn't have expected AQA to include A Level stuff.

Reply 53

8472

OP

21

Good luck to everyone sitting this tomorrow morning! :hugs:

Reply 54

rf14

11

can someone please tell me if we need to know what comes out of the fractions of fractional distillation (kerosene etc)?! thanks

Original post by 8472

AQA GCSE Chemistry 8462 - Paper 2 - 12th June

night before breakdowns

Welp, I'm having a night before breakdown. :gthumb:

Reply 56

rf14

11

Original post by RazzzBerries

Welp, I'm having a night before breakdown. :gthumb:

me too !!! I’m sure you’ll be fine

Original post by rf14

me too !!! I’m sure you’ll be fine

Ahaha thank you! Let's power through :dumbells:

I know I failed Paper 1, that why I feel the pressure to do well tommorrow :'(

Reply 58

rf14

11

Original post by RazzzBerries

Ahaha thank you! Let's power through :dumbells:

I know I failed Paper 1, that why I feel the pressure to do well tommorrow :'(

no point worrying about the past ones, you can’t change them but you still have full control over what happens tomorrow ! don’t stay up v late revising though bc you perform so much better when you’re properly rested ! best of luck you’ll do amazing