Chem Homework - Please help (again)

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Chem Homework - Please help (again)

Postby splodge » Tue Mar 07, 2006 9:59 pm

Thanks again for all your help last time guys I really appreciate it :D

Ive got another question that I just dont get at all and it has to be in tomorrow. Ive looked at my written work and none of it looks like it applies to this question so im a bit stumped.

It asking me to:
Give the mechanism of the reaction between chlorine and methane
Give the mechanism of the reaction between chlorine ethene
Name the type of fission that the Cl-Cl bond undergoes in each of the mechanisms

I really havent a clue where to start so any help would be really really appreciated. Can anyone help?

Thanks x
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Postby umistgirl » Tue Mar 07, 2006 10:31 pm

Name the type of fission that the Cl-Cl bond undergoes in each of the mechanisms


Homolytic Fission - the bond is broken evenly.

Give the mechanism of the reaction between chlorine and methane


See, this all happens in a chain reaction so Im not sure which part(s) of the reaction they want you to discribe. If in doubt give them all though!

initiation:

Cl2 -> 2Cl. (that dot is a free radical)

propagation:

CH4 + Cl. (the free radical you made earlier) -> CH3. (this is now a free radical) + HCl

The CH3 radical reacts with some more chlorine .....

Cl2 + CH3. ---> CH3Cl + Cl. (producing anther free radical)

The chloromethyl group reacts with another free radical

CH3Cl + Cl. ---> CH2Cl. (this is now your free radical) + HCl

Termination: two free radical entities react together

i.e. Cl. + Cl. ---> Cl2 (utterly pointless- your right back to the start)
or CH3. + CH3. ---> C2H6 (ethane)
or CH3. + Cl. -> Ch3Cl (one of your intermediates)

Give the mechanism of the reaction between chlorine ethene


Do the above but for an ethane instead of a methane i.e. C2H6 instead of CH4...your carbon based free radical will now be C2H5. etc etc

Gosh, all this seems such a distant memory now (thankfully!)- so there are probably loads of errors- MMK or someone still studying chem please feel free to correct me!
Always and never are two words you should always remember never to use.
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Postby splodge » Tue Mar 07, 2006 10:42 pm

THANK YOU THANK YOU THANK YOU!!!!
:D :D :D :D :D
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Postby LME79 » Wed Mar 08, 2006 9:50 am

Haha, this is why I chose the arts path. This is a foreign language to me!
I want to be..a tree..
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Postby peecee » Wed Mar 08, 2006 10:08 am

But isn't it all exciting... :o :o :o
Shine your light and let the whole world see.
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Postby kitkat » Wed Mar 08, 2006 6:55 pm

dnt kno answer but i used to use homeworkhigh.com to ask educational questions.
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Postby will1066 » Sun Jul 08, 2007 3:57 am

just finished a chemistry a-level and i should really know all that :roll: but truth be told you might as well have written it in hebrew :P
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Postby splodge » Sun Jul 08, 2007 4:37 am

Its a good thing I dropped chemistry seriously. The hardest thing I've ever tried to learn.
Slander against cats, write that down.
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Postby marisa » Thu May 15, 2008 12:03 am

well im studying a masters in chemistry, your post was a long time ago so i wont answer bt if you need any help at all get in touch

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