AQA CHEM2 ~ May 23rd 2012 ~ AS Chemistry
Chemistry exam discussion - share revision tips in preparation for GCSE, A Level and other chemistry exams and discuss how they went afterwards.
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Re: AQA CHEM2 ~ May 23rd 2012 ~ AS ChemistryHi, your link to January 2012 AQA CHEM2 Past Paper is actually for CHEM1 not unit 2 . Do you know unit 2 question paper link? I need it urgently. Thanks(Original post by Sorro10)
Hey thought I'd make a thread for the MAY 2012 AQA CHEMISTRY UNIT 2 (CHEM2) exam in a couple of months.
Feel free to share notes/tips/materials/questions and thoughts on the exam.
DATE OF EXAM: CHEM 2 - 1H 45 MINS - 23 MAY 2012 - PM
SYLLABUS:
http://store.aqa.org.uk/qual/gce/pdf/AQA-2420-W-SP.PDF
- Scroll down to Unit 2 - Chemistry in Action
PAST PAPERS & MARK SCHEMES:
http://www.aqa.org.uk/qualifications...-key-materials
http://www.thestudentroom.co.uk/atta...4&d=1333055827 <-- January 2012 AQA CHEM2 Past Paper
USEFUL REVISION WEBSITES:
http://www.chemguide.co.uk
http://www.a-levelchemistry.co.uk/AQ...try%20home.htm
DAYS TO EXAM: 41
(May be out of date max ~1 week)
GOOD LUCK ALL
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Re: AQA CHEM2 ~ May 23rd 2012 ~ AS ChemistryMechanisms - sort of. Look at pg. 205 of your AS text book. The addition of H2SO4 (electrophilic addition), and then adding water to that product is hydration. The H2SO4 there acts as a catalyst for the hydration(Original post by alex7892)
Can someone help me out with the hydration of ethene (and other alkenes) and dehydration of an alcohol. Do we need to be able to draw the mechanism? What are the catalysts? Thanks.
OK so hydration. Well adding H2O to an alkene will hydrate it. It's a method used to make alcohols (the purest method) and occurs by adding steam to ethene using an acid catalyst. The catalyst you're best off using is H3PO4 (phosphoric acid).
Dehydration of an alcohol is the reverse - pg. 219. An OH and H come off adjacent carbon atoms of the alcohol with either excess H2SO4 or passing vapours over heated Aluminium oxide. Remember that as different H atoms can come off, and sometimes even different OH groups, you will often get different products, isomers ie. stereoisomers (geometrical isomers)
It's all in the text book. Do you have one? -
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Re: AQA CHEM2 ~ May 23rd 2012 ~ AS ChemistryThanks alot. Really useful information. And yes I do have a text book, just wanted to hear it in someone's own words. Thanks again for this.(Original post by extons)
Mechanisms - sort of. Look at pg. 205 of your AS text book. The addition of H2SO4 (electrophilic addition), and then adding water to that product is hydration. The H2SO4 there acts as a catalyst for the hydration
OK so hydration. Well adding H2O to an alkene will hydrate it. It's a method used to make alcohols (the purest method) and occurs by adding steam to ethene using an acid catalyst. The catalyst you're best off using is H3PO4 (phosphoric acid).
Dehydration of an alcohol is the reverse - pg. 219. An OH and H come off adjacent carbon atoms of the alcohol with either excess H2SO4 or passing vapours over heated Aluminium oxide. Remember that as different H atoms can come off, and sometimes even different OH groups, you will often get different products, isomers ie. stereoisomers (geometrical isomers)
It's all in the text book. Do you have one?
Quick question though. If, in the exam, I was asked "How would you dehydrate an alcohol?" I could just say using excess H2S04 or by saying passing vapours of the alcohol over heated aluminium oxide?
Yes I will take into account that isomers can be formed!
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Re: AQA CHEM2 ~ May 23rd 2012 ~ AS ChemistryIt's in the 1st post(Original post by alex7892)
Also. Can anyone get hold of the January 2012 Chem2 Past Paper. I have unit 1 if anybody needs it! -
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Re: AQA CHEM2 ~ May 23rd 2012 ~ AS ChemistryNooo that's chem1 if you click it...(Original post by ElMoro)
It's in the 1st post -
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Re: AQA CHEM2 ~ May 23rd 2012 ~ AS ChemistryOh, sorry!(Original post by alex7892)
Nooo that's chem1 if you click it...
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Re: AQA CHEM2 ~ May 23rd 2012 ~ AS ChemistryIt wouldn't make a dot of difference! I personally would use the aluminium oxide one as that is an experiment I have carried out before, but both are just as creditable!(Original post by alex7892)
Thanks alot. Really useful information. And yes I do have a text book, just wanted to hear it in someone's own words. Thanks again for this.
Quick question though. If, in the exam, I was asked "How would you dehydrate an alcohol?" I could just say using excess H2S04 or by saying passing vapours of the alcohol over heated aluminium oxide?
Yes I will take into account that isomers can be formed!
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Re: AQA CHEM2 ~ May 23rd 2012 ~ AS Chemistry(Original post by lovemenot)
Hi, your link to January 2012 AQA CHEM2 Past Paper is actually for CHEM1 not unit 2 . Do you know unit 2 question paper link? I need it urgently. Thanks
OH think I copied wrong link, will post correct one later. -
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Re: AQA CHEM2 ~ May 23rd 2012 ~ AS Chemistryi would like the chem2 jan 12 paper please!(Original post by Sorro10)
OH think I copied wrong link, will post correct one later. -
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Re: AQA CHEM2 ~ May 23rd 2012 ~ AS ChemistryCHEM2 Jan 12.pdf(Original post by Nat49)
i would like the chem2 jan 12 paper please! -
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Re: AQA CHEM2 ~ May 23rd 2012 ~ AS ChemistryI still don't know anything about biofuels, extraction of metals, recycling metals... my teacher set these topics as group posters, so I think each group knows their own poster well but not the others
For me the hardest thing in this exam is the infrared spectroscopy, I just don't see it! Mechanisms are my favourite part
