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AS Chemistry- helping each other out!

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Original post by Super199
I need some help on it.
Question: If an excess of methane is used CH3Cl is the major product. Suggest why by reference to the steps in the mechanism.

I am thinking it has something to do with the fact if there is an excess of methane the chlorine radical is more likely to collide with it so makes CH3Cl?


EDIT - I think you're right actually.
(edited 9 years ago)
Reply 601
Guys can anyone please get me copy of some good as level organic chemistry questions preferably a worksheet
Thanks

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Original post by shfq
Guys can anyone please get me copy of some good as level organic chemistry questions preferably a worksheet
Thanks

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www.a-levelchemistry.co.uk

Shouldn't be too hard to find some worksheets.

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Original post by zhang-liao
Yep I am, I think a few of us here are doing that :smile:





Original post by Super199
Anyone doing the chemistry Olympiad

Wait are we talking about doing it next year or ...?
My school only offers the senior chemistry challenge for AS year
Original post by lyricalvibe
Wait are we talking about doing it next year or ...?
My school only offers the senior chemistry challenge for AS year

Na this year? Doing on Tuesday or Thursday I think?
Original post by lyricalvibe
Wait are we talking about doing it next year or ...?
My school only offers the senior chemistry challenge for AS year


I'm doing mine this year

Original post by Super199
Na this year? Doing on Tuesday or Thursday I think?


Mine's on Tuesday but its subject to the teacher though
Original post by zhang-liao
I'm doing mine this year



Mine's on Tuesday but its subject to the teacher though

Wait is it the same test?
Original post by Super199
Wait is it the same test?


If you're doing the Chemistry Olympiad, then yeah
Original post by zhang-liao
If you're doing the Chemistry Olympiad, then yeah

Right you shall tell me the questions that come up haha
Original post by Super199
Right you shall tell me the questions that come up haha


I don't think we're allowed to share questions on TSR :redface:
Feeling a bit late to the party right now, but only just found this thread!

Currently doing Edexcel AS
Original post by haemo
When drawing the structural formula of tetrachloromethane, would you write:

CClClClCl or CCl4 (yet CCl4 is the molecular formula...)


Similarly, which one is correct out of ClBrCH, CHBrCl or BrCHCl? (I'm wondering if this matters at all)


In the case of tetrachloromethane, you'd write CCl4 not CClClClCl. I can't really explain it well but you need to look at what surrounds each carbon atom though

I believe CHBrCl would be accurate.
Original post by Super199
Right can someone help me out. Fairly simple but I can't remember how it is done.

Let's say you have 1-chloropropane the molecular formula or whatever it is called is
CH3CH2CH2Cl

How do you write it for 2-chloropropane?

Is it CH3CHClCH2


CH3CHClCH3


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Original post by haemo
Finally, one more question:

Would you put a functional group before a side-chain with this example:

E.g: CBr(CH3) or C(CH3)Br


I think its best write C(CH3)Br.

In the case of CH3CH2C(CH3)Br, you'll see that the side-chain comes before the functional group
Original post by Clovers
Hi everyone! could someone please help me ... In energetics when working out the enthalpy of neutralisation, how do you work it out when the concentrations for the acid and alkali are different? Thanks I'd appreciate any help :smile:


Just asking, what Unit and exam board are you talking about?

I've only covered Edexcel Unit 1 and haven't been asked any kind of question like that before :confused:
Hello Guys,
I'm doing Edexcel AS Chemistry, so could someone please reassure me if I need to memorise all the HSW boxes for the exam, will we ever be tested on the HSW boxes??
There's soo many HSW Boxes and I just can't memorise them all.
:afraid:
Original post by zhang-liao
Just asking, what Unit and exam board are you talking about?

I've only covered Edexcel Unit 1 and haven't been asked any kind of question like that before :confused:


umm ... AQA and unit 2, :frown: its okay nevermind, do you know of anyone else here who is doing AQA and has started unit 2?
Original post by Clovers
umm ... AQA and unit 2, :frown: its okay nevermind, do you know of anyone else here who is doing AQA and has started unit 2?



You might want to ask BCMFM16 or Dylann for some more help :colondollar:
Reply 618
Original post by underestimate
Hello guys, I am on OCR A, just finished unit 1 and going on to organic chemistry. :smile:


Same! :smile:
Original post by Anne james
Hello Guys,
I'm doing Edexcel AS Chemistry, so could someone please reassure me if I need to memorise all the HSW boxes for the exam, will we ever be tested on the HSW boxes??
There's soo many HSW Boxes and I just can't memorise them all.
:afraid:


What are hsw boxes?


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