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Hudl
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Hello Guys

I know this may be a bit early but a lot of people I know are already starting to struggle and some revise for this test Image.I could't find a thread for CHEM1 on student room so thought I should create one and get things under way.Feel free to discuss anything relating to Chemistry Unit 1 here. Image We are currently doing sub shells so ye.


REVISION WEBSITES:

http://www.chemguide.co.uk
http://alevelchem.com/index.php
http://www.a-levelchemistry.co.uk/AQ...try home.htm


PAST PAPERS & MARK SCHEMES:


http://web.aqa.org.uk/qual/gce/scien...-materials.php
(January 2009-June 2011 Past Papers+Mark schemes)

http://www.xtremepapers.com/papers/AQA/Chemistry/
(
2002-2008 Past Papers+Mark schemes)

http://freeexampapers.com/#A Level/Chemistry/AQA
(Jan/June 2002 - 2011 Paper & Mark scheme)



SYLLABUS:

http://store.aqa.org.uk/qual/gce/pdf/AQA-2420-W-SP.PDF

Date of the exam : 23rd May 2014 (AM)


Unit 2 Thread click here

Unofficial Mark scheme


1. a) i) 1.6734*10^-24
ii) B
b) i) 20%
ii) Same arrangement of electrons in shells
c) between 3000-10,000 they will probs allow ( i got this wrong stupidly put like 17,000)
d) B+(g) --> B2+ (g) + e-
e) Removing it from a positive charged ion which is attracting it

2. a) i) something like 0.00879
ii) 0.75*a)i)
iii) 0.00126 cubic metres
b) thermal decomposition
c) only solid product, others are gases and will disperse

3. a) i) d block
ii) strong metallic bonding between ions because theres lots of valence electrons and also size of ions is small due to large amount of protons causing strong attraction between positive ions and negative delocalised electrons
iii) OOO
OOO labelled with + inside ions
iv) layers of atoms which can slide over each other.
b) i) 1s2 2s2 2p6 3s2 3p6 4s2 3d6
ii) 1,6,1,6,12 & Calcium Carbonate/ Calcium Oxide

4. a) i) Hydrogen bonds
ii) basically include all delta partial charges, the lone pair on each nitrogen and a dotted line going from lone pair to hydrogen with NHN in a straight line
b) Lone pair of electrons on nitrogen forms co-ordinate bond with boron atom. both electrons in bond come from nitrogen.
c) i) The tendency of an atom to draw an electron density closer to itself in a covalent bond
ii) LiF
iii) I think it's H3B as it does say compound and H2 or F2 arent compounds, theyre elements

5. a) crude oil; fractional distillation
b) c12h26 + 12.5 O2 --> 12CO + 13H2O
c) i) High temperature from combustion of paraffin causes nitrogen in air to combust
ii) 2NO + O2 --> 2NO2
iii) 4NO2 + O2 + 2H2O ---> 4HNO3
d) i) C n H 2n+2
ii) C12H26 --> C6H12 + C6H14 ; C3H7 ; zeolite/aluminosilicate/silicon/aluminium oxide
iii) dodecane is bigger molecule so it has more electrons and more van der waals BETWEEN MOLECULES
e) 2,2,3,3,4,4-hexamethylhexane ; chain
f) Cl2

6. a) i) something like 1.28 molperdm3 or something i cant remember exactly
ii) 71.5% (i did this wrong calculate Mr of calcium nitrate wrong so probably dropped 1 mark Image)
b) 3Ca(OH)2 + 2H3PO4 --> Ca3(PO4)2 + 6H2O
c) empircal formula was Ca(H2PO4)2 and x=2

7. a) TlBr3 2- should be tetrahedral with Tl centre, electron density at top and Br on each other vertex.
TlCl4 3- should be trigonal bipyramid with 4 Chlorine--Thallium bonds and 1 electron density

Shape = tetrahedral/trigonal pyramid
Angle= 107/107.5

b) Ionic bonding; strong electrostatic attraction between oppositely charged IONS
c) Tl (s) + 0.5 Br2 (g) --> TlBr (s) (not sure if state symbols required)

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ryanb97
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Reserved for notes...my notes
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ryanb97
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2nd reserved post....
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green12345
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does anyone have the june 2013 paper unit one aqa
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Hudl
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Been looking for it myself
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HelpTheInnocent
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How have you got the exam date so early? :eek:

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katie_brown13
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Does anyone have the unit 1 chemistry may/june mark scheme??
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katie_brown13
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(Original post by green12345)
does anyone have the june 2013 paper unit one aqa
Here you go
Attached files
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HolmesandWatson
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Do you happen to have the mark scheme with that?
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Raymankiing
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Ah did this exam last year think I got 92 or 93

Do your best on this one, A2 is tons harder and every ums u can get from Chem1 counts.


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Hudl
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How is everyone planning on recapping this whilst doing Unit 2?
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smozsolution
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(Original post by AhmedDavid)
How is everyone planning on recapping this whilst doing Unit 2?
Past papers, practice questions and flashcards

Also, seeing this thread has reminded me how close exams are now that we've started 2014 :eek:
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smallbridge22
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Hey, i got a U in my mock and i dont want a repeat of that in may sooo can anyone give me revsion tips?
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smozsolution
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(Original post by smallbridge22)
Hey, i got a U in my mock and i dont want a repeat of that in may sooo can anyone give me revsion tips?
I'll repeat what I said to someone else who said a similar thing:

Find out where you lost your marks and target the weaker points. Ask your teachers for any advice and practice as many questions as you possibly can between now and May.
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Hudl
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(Original post by smozsolution)
Past papers, practice questions and flashcards

Also, seeing this thread has reminded me how close exams are now that we've started 2014 :eek:
Great, do you make your own flash cards?

& I got an A - 86% in my mock however Im really scared I will forget how to answer the harder set of questions when it comes to the real exam.

Have you dont your mock yet? & if so what did you get

(Original post by smallbridge22)
Hey, i got a U in my mock and i dont want a repeat of that in may sooo can anyone give me revsion tips?
TSR has a lot of useful resources that will help you to get organised. eg the Study planner; make sure you're using it to help you organise Unit 2 revision and Unit 1 revision so that you're in tip form for the exam. Simply go over the content, reading the book and making notes and answering questions making sure you fully understand each topinc and I'm sure you'll be well on your way to an A (aswell as doing all the past papers before the exam)
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smozsolution
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(Original post by AhmedDavid)
Great, do you make your own flash cards?

& I got an A - 86% in my mock however Im really scared I will forget how to answer the harder set of questions when it comes to the real exam.

Have you dont your mock yet? & if so what did you get
Usually yes, as I find it far easier to revise from something I've made notes on as I know what it means.

Yeah, I'm the same but I'm hoping my methods will work and it won't be too bad. I got an A with 90% which I was really happy about
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smallbridge22
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(Original post by AhmedDavid)
Great, do you make your own flash cards?

& I got an A - 86% in my mock however Im really scared I will forget how to answer the harder set of questions when it comes to the real exam.

Have you dont your mock yet? & if so what did you get



TSR has a lot of useful resources that will help you to get organised. eg the Study planner; make sure you're using it to help you organise Unit 2 revision and Unit 1 revision so that you're in tip form for the exam. Simply go over the content, reading the book and making notes and answering questions making sure you fully understand each topinc and I'm sure you'll be well on your way to an A (aswell as doing all the past papers before the exam)
thanks alot! But say you did a past paper and you got a bad mark apart from looking at the mark scheme what do you do? Also this is going to sound dumb but how do you make notes for chem? do you know any useful websites?
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Hudl
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(Original post by smallbridge22)
thanks alot! But say you did a past paper and you got a bad mark apart from looking at the mark scheme what do you do? Also this is going to sound dumb but how do you make notes for chem? do you know any useful websites?
No problem & If you did a past paper, and it was marked and a bad score was achieved. Apart from looking at the mark scheme you can review the paper and use your textbook to review the questions you got wrong; reading the appropriate chapter and understanding what you have done wrong and how to do it better next time. Then reattempting the question. But it is inevitable you use the mark scheme to see ideally what the examiners want.

You make notes by simply reading the book. Read a paragraph and using the specification if needed pick out the key points from that paragraph and put it in your own words it helps you remember it. However get used to the terminology of the subject and adapt your "Own words" to be like that of the text book. With more practise you will become better at this. Also when reading the textbook if you come across any word or sentence you dont know the meaning of or do not understand, DO NOT move on until you fully understand it. Use the internet, dictionary etc to make sure you actually understand the meaning of what you are reading.

Ive mentioned some good websites for chemistry already at the top: there is also Bluecoatchemistry on youtube Tywin Lannister has some good videos for AS & A2 level chemistry. However the good old reading it yourself and understanding it is the best way to go.
(Original post by smozsolution)
Usually yes, as I find it far easier to revise from something I've made notes on as I know what it means.

Yeah, I'm the same but I'm hoping my methods will work and it won't be too bad. I got an A with 90% which I was really happy about
Wow thats a good score, well done. How are you finding Unit 2
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smozsolution
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(Original post by AhmedDavid)
Wow thats a good score, well done. How are you finding Unit 2
Thank you

I am quite enjoying unit 2 at the moment. I like Energetics and Kinetics but I'm struggling a bit with Equilibria. With my other teacher we've done Haloalkanes which isn't too bad, just the mechanisms are a pain to draw out to get full marks! How are you finding it?
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Hudl
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(Original post by smozsolution)
Thank you

I am quite enjoying unit 2 at the moment. I like Energetics and Kinetics but I'm struggling a bit with Equilibria. With my other teacher we've done Haloalkanes which isn't too bad, just the mechanisms are a pain to draw out to get full marks! How are you finding it?
I'm actually finding unit 2 pretty straight forward. We have done kinetics equilibrium and group 2 alkaline metals and extraction of metals
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