This discussion is now closed.

Check out other Related discussions

Official AQA GCSE Chemistry Unit 2 24th Janurary NEW SPEC

because when ions move to the electrodes they always return to being atoms, without their full outer shells. Due to this oxygen obviously wants that full outer shell again after losing electrons when attracted to the positive electrode/anode, so oxygen atoms bond covalently with the carbon atoms of the carbon positive electrode/anode and carbon dioxide gas is formed.

Could you also due to the high temperatures carbon can react with the oxygen? Not too sure though tbh... :confused:

Reply 61

NightStrider

Original post by sakbo

Could you also due to the high temperatures carbon can react with the oxygen? Not too sure though tbh... :confused:

I'm not sure. BTW, I am from calday

Reply 62

sakbo

Can anyone PLEASE tell me whether or not we need to know solubility rules??? eg: all ammonium salts are soluble etc... Thanks :smile:

Reply 63

NightStrider

Original post by sakbo

Can anyone PLEASE tell me whether or not we need to know solubility rules??? eg: all ammonium salts are soluble etc... Thanks :smile:

Im not sure, I'm learning the majority of them anyway. Remember: if you want to make an insoluble salt XY, mixing X nitrate with sodium Y will always work. In the example above, X is silver and Y is chloride.

Reply 64

zaynabpatel

Original post by bbadonde2

Biology one didn't trouble me too much but I know it did for a lot of people. I hope the chemistry is good for me as I need an A*

i swear there was only like 3 tissues you could talk about?! ah yeah i got an A* last year hope i get that too this year

Posted from TSR Mobile

Reply 65

Efemena15

4

Original post by sakbo

Can anyone PLEASE tell me whether or not we need to know solubility rules??? eg: all ammonium salts are soluble etc... Thanks :smile:

http://store.aqa.org.uk/sciencelab/AQA-CHEM-W-SP.PDF

Reply 66

blahblahblahxo

what do you guys think the 6 mark question might be???

Reply 67

sakbo

Original post by NightStrider

Im not sure, I'm learning the majority of them anyway. Remember: if you want to make an insoluble salt XY, mixing X nitrate with sodium Y will always work. In the example above, X is silver and Y is chloride.

So surely you could get away with only knowing 2 rules : all compounds of sodium ( or just group 1 metals) are soluble and all nitrates are soluble? Then use this for ALL the possible insoluble salts???

Reply 68

NightStrider

Original post by sakbo

So surely you could get away with only knowing 2 rules : all compounds of sodium ( or just group 1 metals) are soluble and all nitrates are soluble? Then use this for ALL the possible insoluble salts???

Yeah. But better safe then sorry I say

Reply 69

Minecraft27

14

Do we need to know about the Haber process??

Reply 70

Mrkingpenguin

OP

18

Original post by Minecraft27

Do we need to know about the Haber process??

unit 3

Reply 71

Mrkingpenguin

OP

18

poll seems to tell that chromo is coming up, mmm

Reply 72

ForeignHamster

I seem to agree..
i don't think the 6 marker will be on electrolysis(that was already in one of the
recent past paper, maybe electrolysis of brine though?) Make sure you know the three products formed in brine electrolysis! But i reckon that the 6 marker will be on nanoscience, chromotography or catalysts(uses eg enzymes, medicine, future development-->modern catalysts)
Let's just pray that it will be on metals or covalent structures!
Good luck :smile:

Reply 73

sakbo

Right, if the 6 marker was on GC-MS what would the question be like and how would you answer it? Not too sure how you would fit enough info in :/

Reply 74

trishma

Do you reckon there will be anything on fullerenes??!!

Reply 75

ayshac94

1

http://www.youtube.com/watch?v=PsLTGT6PTuk&list=PLsorq7UsrfYttVO5Xfsj2nVhHwQTPFaTm
i've been revising off these videos and taking notes, its really helpful guys :smile:

Reply 76

Efemena15

4

Describe and explain how electrolysis is used to make pure copper from a lump of
impure copper.

Reply 77

NightStrider

Original post by ayshac94

http://www.youtube.com/watch?v=PsLTGT6PTuk&list=PLsorq7UsrfYttVO5Xfsj2nVhHwQTPFaTm
i've been revising off these videos and taking notes, its really helpful guys :smile:

So have for the past few hours. On video 26 out of 30 now

Reply 78

blahblahblahxo

Original post by Efemena15

Describe and explain how electrolysis is used to make pure copper from a lump of
impure copper.

is it when the impure copper goes to the anode and the pure copper goes to the cathode. Where sludge and impurities are basically collected at the bottom? :/