AQA GCSE Combined Trilogy Chemistry 8464 - Paper 2 - 12th June 2019

It shift to the right, to produce more sulfur trioxide to counteract the change an then a new equilibrium is established

Original post by ma99ter78681

I put it shifts to the left. Am I right?

Reply 382

Pro Gamer 2003

17

Yeah it favours the side with less molecules and sulfur trioxide has less molecules

Original post by djbello

It shift to the right, to produce more sulfur trioxide to counteract the change an then a new equilibrium is established

Reply 383

manny on the map

6

for the unknown dyes i said use universal indicator on a white tile and compare to the PH scale to see which colour it lines up to. Would that gain any marks? For the question that said how can you tell if there is more than one colour is it because there is more dots where each dot resembles a colour/mixture?

Reply 384

Unfortunately your answer for the first question is no i'm afraid.

However the second part of your answer seems right

In this question there were 2 parts.... part (a) and part (b)
Your answer seems right for part b that if there are more colours/dye/dots there's more than one so is a mixture.
I said in addition to this that if other colours were seperated at the same point then we can identify which colour's are in the dye, because they line up.

part(b) has been discussed by our fellow students above

Original post by manny on the map

for the unknown dyes i said use universal indicator on a white tile and compare to the PH scale to see which colour it lines up to. Would that gain any marks? For the question that said how can you tell if there is more than one colour is it because there is more dots where each dot resembles a colour/mixture?

Reply 385

karthii_.x

11

I wrote something about RF values and comparing it to the databases to find out the dyes in the unkown food colour, i also said compare the spots on the unkown food colour to the known dyes

Original post by manny on the map

for the unknown dyes i said use universal indicator on a white tile and compare to the PH scale to see which colour it lines up to. Would that gain any marks? For the question that said how can you tell if there is more than one colour is it because there is more dots where each dot resembles a colour/mixture?

Reply 386

I said this as well

Original post by karthii_.x

I wrote something about RF values and comparing it to the databases to find out the dyes in the unkown food colour, i also said compare the spots on the unkown food colour to the known dyes

Reply 387

jjxshuaa

8

Original post by djbello

For phytomining who said:
1) grow plant on low grade copper soil, they then absorb the copper
2) harvest and burn the plant
3) combine copper Rich ash with sulfuric acid to make a leachate
4) add scrap iron to displace copper
5) use electrolysis to purify the copper
This is what I remember writing, I'm not sure if it's right though, what did anyone else put?

Pretty sure leachate is only produced through bioleaching, but im pretty sure you’ll get full marks for ur other points.

Reply 388

Mina16000

For the nitrogen oxides question i wrote that when fuels burn temperature rises and that causes oxygen in the air to react with nitrogen which forms nitrogen oxide
is that right?

Reply 389

This is what I put, what did you say for the two equations for combustion and why the products were different

Original post by Mina16000

For the nitrogen oxides question i wrote that when fuels burn temperature rises and that causes oxygen in the air to react with nitrogen which forms nitrogen oxide
is that right?

Reply 390

Mina16000

i just guessed that one cuz i was running out of time i talked about the oxygen cuz the first one had 13 the second one had 5

Original post by djbello

This is what I put, what did you say for the two equations for combustion and why the products were different

Reply 391

I talked about the first one doing complete combustion because there was enough oxygen and the second one doing incomplete combustion because the wasn't enough oxygen. Do you think this is enough to get full marks?

Original post by Mina16000

i just guessed that one cuz i was running out of time i talked about the oxygen cuz the first one had 13 the second one had 5

Reply 392

Shania Paul

10

yeah i said similar to you except the part about electrolysis

Original post by djbello

For phytomining who said:
1) grow plant on low grade copper soil, they then absorb the copper
2) harvest and burn the plant
3) combine copper Rich ash with sulfuric acid to make a leachate
4) add scrap iron to displace copper
5) use electrolysis to purify the copper
This is what I remember writing, I'm not sure if it's right though, what did anyone else put?

Reply 393

UmarT

You were exactly right

Reply 394

Who?

Original post by UmarT

You were exactly right

Reply 395

Why are you so smart?

Your answer here is basically 5/4 marks (which is impossible, but much deserved)

Original post by djbello

For phytomining who said:
1) grow plant on low grade copper soil, they then absorb the copper
2) harvest and burn the plant
3) combine copper Rich ash with sulfuric acid to make a leachate
4) add scrap iron to displace copper
5) use electrolysis to purify the copper
This is what I remember writing, I'm not sure if it's right though, what did anyone else put?

Reply 396

Thanks, I'm planning on doing chemistry for A level so I really wanted a 8 or a 9 in it, what are you targeted for science?

Original post by JennieB^2

Why are you so smart?

Your answer here is basically 5/4 marks (which is impossible, but much deserved)

Reply 397

My MEG grade is 5. But i get much higher in the mocks and aiming for the same grade 7 i got before

Also planning to do A-level btw

Original post by djbello

Thanks, I'm planning on doing chemistry for A level so I really wanted a 8 or a 9 in it, what are you targeted for science?

Reply 398

That's really good. At least it's nearly over, all that's left is physics and we are all done

Original post by JennieB^2

My MEG grade is 5. But i get much higher in the mocks and aiming for the same grade 7 i got before

Also planning to do A-level btw

Reply 399