You are Here: Home

# AQA CHEM2 ~ May 23rd 2012 ~ AS Chemistry

Announcements Posted on
Fancy winning £500? Join the Summer Bucket List Challenge and beat the holiday boredom! 06-07-2015
1. Yea written one is on 23rd
2. em that unit 1 jan 2012 paper is missing the first question for some reason first question asks about covalent bonding if i remember rightly.
3. (Original post by cuckoo99)
em that unit 1 jan 2012 paper is missing the first question for some reason first question asks about covalent bonding if i remember rightly.
Dative Covalent (co-ordinative, Coordinate Covalent Bonds) i believe .
Also, i have been revising Unit 2 for quite a while if anyone can give me any tips or advice it would be much appreciated as of current i am just trying to remember by repetition.
Extra Info: I didn't do well on Unit 1 due to panicking and failed to be not lazy and do revision over Christmas and played COD instead..that has stopped now
4. Yea sorry i got confused with my maths C2 exam lol
5. (Original post by W4L1Y)
Yea sorry i got confused with my maths C2 exam lol
what did you get in chem 1 dont mind me asking lol , going to do it june again
6. (Original post by Jcon1)
Dative Covalent (co-ordinative, Coordinate Covalent Bonds) i believe .
Also, i have been revising Unit 2 for quite a while if anyone can give me any tips or advice it would be much appreciated as of current i am just trying to remember by repetition.
Extra Info: I didn't do well on Unit 1 due to panicking and failed to be not lazy and do revision over Christmas and played COD instead..that has stopped now
For unit 2, best advise I can give Is just make sure you know the definitions from the small blue Collins book. My teacher went to one of the examiners questions days and he had with him the small blue Collins book and literally referred to most of the book throghout the day!

the NT book...he didn't even use it once! It's too much 'how science works' not enough raw content!

It's a larger paper, considerably. Just take it question by question and don't get too complacent! Revision for the exam is really needed
7. i got a C was one ums of a b i could have done really good but realy really silly mistakes like the deviation question i put oxygen when it was Boron lol
8. (Original post by Jcon1)
Dative Covalent (co-ordinative, Coordinate Covalent Bonds) i believe .
Also, i have been revising Unit 2 for quite a while if anyone can give me any tips or advice it would be much appreciated as of current i am just trying to remember by repetition.
Extra Info: I didn't do well on Unit 1 due to panicking and failed to be not lazy and do revision over Christmas and played COD instead..that has stopped now
nah it was asking for the definition of a covalent bond e.g sharing of a pair of electrons between 2 atoms. i did badly aswell though it was due to some personal problems, i got a D
9. Has anyone got the CHEM2 JAN 2012 QUESTION PAPER? ive been looking all over for it. if you have this paper can you please upload it?
10. (Original post by Learner_108)
Has anyone got the CHEM2 JAN 2012 QUESTION PAPER? ive been looking all over for it. if you have this paper can you please upload it?
I second this, wouldn't mind starting to print off my past papers now
11. The amount of equations in Extraction of Metals is making me go crazy
12. (Original post by Mocking_bird)
The amount of equations in Extraction of Metals is making me go crazy
Lol same here
13. (Original post by Mocking_bird)
The amount of equations in Extraction of Metals is making me go crazy
If you can't handle the heat then get out of the blast furnace.
14. (Original post by Mocking_bird)
The amount of equations in Extraction of Metals is making me go crazy
hehehe off the top of my head there is :
2Fe2O3 + 3C ----> 4Fe + 3CO2
WO3 + 3H2 ----> W + 3H2O
Fe2O3 + 2Al -----> Al2O3 + Fe
TiO2 + 2Cl2+ 2C ----> TiCl4 + 2CO
TiCl4+4Na -----> Ti + 4NaCl
2V2O5 + 5Si ------> 5SiO2 + 4V

and electrolysis half equations:
Al3+ + 3e- ------> Al
2O2- ----> O2 + 4e-
15. Hi guys, I've got a question on adding sulphuric acid to the halide solutions, as I wrote something in class but it conflicts with the answers found on a-level chemistry.

So it's when you add bromide ions to sulphuric acid.

Half equations:
2Br- --> Br2 + 2e-
2e- + 2H+ + H2SO4 --> SO2 + 2H2O

Are these right?

As I thought you just combine them, and you get 2Br- + 2H+ + H2SO4 --> Br2 + SO2 + 2H2O. But the a-level chemistry website says: 2H2SO4 + 2Br- --> SO2+ Br2 + 2H2O + SO4^2-.

Can someone explain which one is correct please?
16. (Original post by cuckoo99)
hehehe off the top of my head there is :
2Fe2O3 + 3C ----> 4Fe + 3CO2
WO3 + 3H2 ----> W + 3H2O
Fe2O3 + 2Al -----> Al2O3 + Fe
TiO2 + 2Cl2+ 2C ----> TiCl4 + 2CO
TiCl4+4Na -----> Ti + 4NaCl

and electrolysis half equations:
Al3+ + 3e- ------> Al
2O2- ----> O2 + 4e-
I have more than that on just the first 2 pages of my booklets
Will type them up later maybe so somebody can hopefully tell me i'm learning way more than i need to,
17. (Original post by Mocking_bird)
The amount of equations in Extraction of Metals is making me go crazy
I'm sure there's not that many
18. (Original post by MedicalMayhem)

2Br- --> Br2 + 2e-
2e- + 2H+ + H2SO4 --> SO2 + 2H2O

2Br- + 2H+ + H2SO4 --> Br2 + SO2 + 2H2O.
Nothing wrong with those.
19. (Original post by Tullia)
Nothing wrong with those.
Ah okay, so in an exam that'd be okay? What's the other thing talking about then, with the sulphate ions? Is that equation correct as well?
20. So this is too much then?

Extraction of Iron
1) Coke reacts with hot air - very exothermic, responsible for high temps in furnace
$C+ O_{2} \rightarrow CO_2$

2) Carbon dioxide at high temps reacts with unreacted coke
$CO_2 + C \rightarrow 2CO$

3) Carbon monoxide acts as a reducing agent and reduces most of Iron(III) oxide.
$Fe_2O_3+3CO \rightarrow 2Feevis+ 3CO_2$

4) Coke also acts as a reducing agent in the hotter area of the furnace at the bottom.
$Fe_2O_3+3C \rightarrow 2Fe+ 3CO$

5) Limestone is used to remove impurities. Limestone first decomposes.
$CaCO_3 \rightarrow CaO + CO_2$

6) Calcium oxide produced is a basic oxide and reacts with acidic oxides.
$CaO + SiO_2" \rightarrow CaSiO_3$

Extraction of Copper:
Original method:
1) Reduce ore to copper oxide by heating
$CuCO_3 \rightarrow CuO + CO_2$

2) Oxide heated with coke
$2CuO + C \rightarrow 2Cu + CO_2$

3) Overall equation:
$2CuCO_3 + C -> 2Cu + 3CO_2$

Recent way:
$Cu^{2+} + Fe > Cu + Fe^{2+}$.

Extraction of Maganese:
$MnO_2 + C \rightarrow Mn + CO_2$

Extraction of Tungsten:
$WO_3 + 3H_2 \rightarrow W + 3H_2O$

So thats not including extraction of aluminium (4 equations), titanium(2 equations), carbide formation (1) , and 3 pollution problem equations. [Didnt want to type them out as if i've not learnt that far yet].
If ive just learnt all them for no reason my teacher is evil for giving us this booklet to learn on our own

## Register

Thanks for posting! You just need to create an account in order to submit the post
1. this can't be left blank
2. this can't be left blank
3. this can't be left blank

6 characters or longer with both numbers and letters is safer

4. this can't be left empty
1. By joining you agree to our Ts and Cs, privacy policy and site rules

Updated: March 20, 2013
TSR Support Team

We have a brilliant team of more than 60 Support Team members looking after discussions on The Student Room, helping to make it a fun, safe and useful place to hang out.

This forum is supported by:
New on TSR

### IB results chat

Find help, advice and support here

### Why is it illegal to be naked?

Study resources
Useful resources

Can you help? Study Help unanswered threadsStudy help rules and posting guidelines

## Groups associated with this forum:

View associated groups
x

# Think you'll be in clearing or adjustment?

## Hear direct from unis that want to talk to you

Get email alerts for university course places that match your subjects and grades. Just let us know what you're studying.

Reputation gems: You get these gems as you gain rep from other members for making good contributions and giving helpful advice.