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 Chemistryhow can you possibly fail D1? it is an absolute joke. i could have sat that paper in year 10 and got an A or a B.(Original post by rturnbull94)
Haha! I failed D1 last year it's alright! Then I dropped it and took up Psychology
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ooh i loved d1... it was just so different!!(Original post by fosterwho)
how can you possibly fail D1? it is an absolute joke. i could have sat that paper in year 10 and got an A or a B.
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woahh no way!!(Original post by fosterwho)
i despise D1 but yes it is easy.
mechanics >>>>>>>>>>>>>>>>>>>>> stats >>>>>>> decision
decision>stats>core>further pure>mechanics -
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Re: AQA CHEM2 ~ May 23rd 2012 ~ AS ChemistryI`m feeling quite confident for this exam, just need to go through mechanisms and conditions(Original post by Mocking_bird)
Feeling ready for this exam... how about you guys?
Just got a few bits of tidying up to do like fully remembering the conditions/observations.
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Re: AQA CHEM2 ~ May 23rd 2012 ~ AS ChemistryCan someone help me with this :
Jan 11 qs 3d..im not sure where this is mentioned in the book :/
http://store.aqa.org.uk/qual/gce/pdf...W-QP-JAN11.PDF -
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Re: AQA CHEM2 ~ May 23rd 2012 ~ AS ChemistryButan-2-ol is a secondary alcohol so it will be oxidised to a ketone - red to green ions(Original post by Jack_Smith)
Can someone help me with this :
Jan 11 qs 3d..im not sure where this is mentioned in the book :/
http://store.aqa.org.uk/qual/gce/pdf...W-QP-JAN11.PDF
2-methylpropan-2-ol is a tertiary alcohol so it will not be oxidised so no change
I will check my text book (Nelson thornes) and give you the page number but it is in there. -
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Re: AQA CHEM2 ~ May 23rd 2012 ~ AS ChemistryHi I've been flicking through and can't see the past paper link for Jan2012 then it made me join so I could comment so I don't even know if this is the same thread. Even if it is on here could somebody please either reupload it or pop the link up on a new comment? Cheers, hope everyone's revish is going well. x
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Re: AQA CHEM2 ~ May 23rd 2012 ~ AS Chemistryhttp://www.thestudentroom.co.uk/show...5#post37466025(Original post by heathrey)
Hi I've been flicking through and can't see the past paper link for Jan2012 then it made me join so I could comment so I don't even know if this is the same thread. Even if it is on here could somebody please either reupload it or pop the link up on a new comment? Cheers, hope everyone's revish is going well. x -
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Re: AQA CHEM2 ~ May 23rd 2012 ~ AS ChemistryWhere is the lone pair of electron on the cyanide ion?(Original post by HadrianH)
Throw those challenging questions at me and hopefully I'll be able to answer them all.
I'll reply with some questions to you.
And so on...
Give the mechanism for the reaction of 2-bromopentane with ammonia.Last edited by Ayakashi; 18-05-2012 at 18:25. -
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Re: AQA CHEM2 ~ May 23rd 2012 ~ AS ChemistryOn the N atom.(Original post by Ayakashi)
Where is the lone pair of electron on the cyanide ion?
Give the mechanism for the reaction of 2-bromopentane with ammonia.
CH3CH2CH2CH(Br)CH3 : Br bond brakes
Lone pairs from N in NH3 to second C
New compound is then [CH3CH2CH2CH(NH3)CH3]+
To get rid of positive ion, one H atom from the NH3 donates its electron and brakes from the compound forming CH3CH2CH2(NH2)CH3
Please correct me/add any steps missing. -
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Re: AQA CHEM2 ~ May 23rd 2012 ~ AS ChemistryOrganic, always organic.(Original post by When you see it...)
Organic chemistry vs transition metals/group chemistry vs physical chemistry.
Which do you prefer?
When you come up to Chem 5 you'll understand why..... You'll have to deal with transition metals and group chemistry, at such length.... it'll make you die a little inside
Learn your mechanisms and you'll be fine guys
I'm doing this exam as a retake as I was ill on the exam day last year... hence my not great grade (passed it but need better to get an A overall!!)
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Re: AQA CHEM2 ~ May 23rd 2012 ~ AS ChemistryYour mechanism is correct however the lone pair is on the Carbon ion, as carbon always forms 4 bonds, yet in a cyanide ion Carbon is bonded thrice to Nitrogen(Original post by HadrianH)
On the N atom.
CH3CH2CH2CH(Br)CH3 : Br bond brakes
Lone pairs from N in NH3 to second C
New compound is then [CH3CH2CH2CH(NH3)CH3]+
To get rid of positive ion, one H atom from the NH3 donates its electron and brakes from the compound forming CH3CH2CH2(NH2)CH3
Please correct me/add any steps missing.
