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AQA GCSE Chemistry Paper 1 8462 Higher - 16 May 2019 Unofficial Markscheme

Oxygen reacts with the carbon electrode to produce carbon dioxide

what was the answer for why the positive elctrode had to be replaced? I said because gas is produced at the positive electrode and it can corrode the electrode

Reply 41

iqraaaaa

9

yeah i got the same for that

Original post by sim_c1

I got 941kg on the 2000kg Aluminium Oxide question and -1002 on the bond energy

Reply 42

LilyMassey111

2

Original post by ettamagill

For the 6mark question on the back I got 0.62 mol/dm3 and then 34.72g/dm3

got the same

Reply 43

Princess7834

4

I got 37.42g/dm^3

Original post by meriem_ait

I got 0.62 mol too!

Original post by mosquito1234

For the last question I got 0.62 mol/dm^3 and 69.44 g/dm^3 for the last question, but the second one is wrong

Reply 44

sahmad35

7

it was 3/2 * 941

Original post by iqraaaaa

yeah i got the same for that

Reply 45

AestheticEnergy

15

I'm feeling confident with the entire paper EXCEPT that last 6 mark question :/
But overall, that was easier than I expected lol

Reply 46

chriswillis29

9

Equation 2

Original post by OptimisticMedic

What did you guys get for the question before the one where it said whether equation 1 or 2 was right?

Reply 47

Rodpods

3

Original post by mosquito1234

For the last question I got 0.62 mol/dm^3 and 69.44 g/dm^3 for the last question, but the second one is wrong

I got the same for both of those but many agree saying we are wrong for the 2nd

Reply 48

chriswillis29

9

H+ was one of the answers and the chromium compound was the catalyst

Reply 49

UN4OWN

5

for the second one i got 51.52 g/dm^3

Original post by Rodpods

I got the same for both of those but many agree saying we are wrong for the 2nd

Reply 50

VelexiaHeart

3

Original post by ettamagill

Post your answers for questions for TRIPLE AQA from today x

I would like an applaude rn your welcome everyone I DRAGED DOWN THE GRADE BOUNDARIES FOR Y'ALL 😉

Reply 51

oliviadaniells02

5

Original post by Ddfvbjjjhgvvh

I got 0.617777777 so did u lot just round to 6.2

i got 0.62 i rounded down i think

Reply 52

ettamagill

OP

4

I don’t know but I said the oxygen would react with the electrode and form a layer of metal oxide around it but i dont know

Original post by kandy1023

what was the answer for why the positive elctrode had to be replaced? I said because gas is produced at the positive electrode and it can corrode the electrode

Reply 53

UN4OWN

5

you probably didnt but thanks anyway you took one for the team i took a hit on biology :frown:

Original post by VelexiaHeart

I would like an applaude rn your welcome everyone I DRAGED DOWN THE GRADE BOUNDARIES FOR Y'ALL 😉

Reply 54

deepakbaji

5

Original post by kandy1023

what was the answer for why the positive elctrode had to be replaced? I said because gas is produced at the positive electrode and it can corrode the electrode

It is because the anode is carbon so reacts with the oxygen forming C02 which is a gas so it burns off.

Reply 55

ettamagill

OP

4

Yeah I worked out the number of moles for each from the weight

Original post by chriswillis29

Equation 2

Reply 56

UN4OWN

5

carbon reacts with oxygen at the anode so carbon dioxide is produced CORRODING the carbon electrode

Original post by deepakbaji

It is because the anode is carbon so reacts with the oxygen forming C02 which is a gas so it burns off.

Reply 57

deepakbaji

5

Original post by Sarahpod8

What was the copperoxide question about? With the burning hydrogen?

To be honest not sure. But i wrote that because the excess hydrogen will go back into the entry tube as it is present in the air so might change the results so has to be burned off to prevent it entering.

Reply 58

Lucysturton4

3

Original post by charlieost

-1200 ish (cant remember the exact number) on the bond energies. And i got 200kg ish for the mass of oxygen however i am not confident :frown:

I got -1272 i think

Reply 59

UN4OWN

5

yes exactly that

Original post by deepakbaji

To be honest not sure. But i wrote that because the excess hydrogen will go back into the entry tube as it is present in the air so might change the results so has to be burned off to prevent it entering.

Original post by Lucysturton4

I got -1272 i think

AQA GCSE Chemistry Paper 1 8462 Higher - 16 May 2019 Unofficial Markscheme

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