A level chemistry

Watch this thread
Alevelhelp.1
Badges: 11
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#1
Report Thread starter 4 months ago
#1
Can u help with this question please.
1) write down the chemical equation for the free radical substitution reaction between ethane and chlorine
0
reply
kpopfangirl
Badges: 10
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#2
Report 4 months ago
#2
(Original post by Alevelhelp.1)
Can u help with this question please.
1) write down the chemical equation for the free radical substitution reaction between ethane and chlorine
Initiation:

So Cl2 -> .Cl + .Cl ( a chlorine molecule is splitted into two free radical chlorines)

Propagation (A.K.A chain reaction)
1) .Cl + CH3CH3 -> •CH3CH2 + HCl (chlorine radical reacts with methane to form HCl and the methane becomes a radical)
2) .CH3CH2 + Cl2 -> .Cl + CH3CH2Cl (chlorine radical is reformed...so it is acting like a catalyst and Chloroethane is formed)

Termination
This step is the reaction where any 2 radicals come together to form a molecule...
e.g 2.Cl -> Cl2

*note the full stop is supposed to represent the radical and should really be placed where the bond had been broken in UV light)
0
reply
Aleksander Krol
Badges: 13
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#3
Report 4 months ago
#3
(Original post by Alevelhelp.1)
Can u help with this question please.
1) write down the chemical equation for the free radical substitution reaction between ethane and chlorine
they haven't asked for the mechanism,so i think it's,
C2H6 + 6Cl2 ----> C2Cl6 + 6HCl
0
reply
kpopfangirl
Badges: 10
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#4
Report 4 months ago
#4
(Original post by kpopfangirl)
Initiation:

So Cl2 -> .Cl + .Cl ( a chlorine molecule is splitted into two free radical chlorines)

Propagation (A.K.A chain reaction)
1) .Cl + CH3CH3 -> •CH3CH2 + HCl (chlorine radical reacts with methane to form HCl and the methane becomes a radical)
2) .CH3CH2 + Cl2 -> .Cl + CH3CH2Cl (chlorine radical is reformed...so it is acting like a catalyst and Chloroethane is formed)

Termination
This step is the reaction where any 2 radicals come together to form a molecule...
e.g 2.Cl -> Cl2

*note the full stop is supposed to represent the radical and should really be placed where the bond had been broken in UV light)
This is the mechanism btw
0
reply
Alevelhelp.1
Badges: 11
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#5
Report Thread starter 4 months ago
#5
(Original post by Aleksander Krol)
they haven't asked for the mechanism,so i think it's,
C2H6 + 6Cl2 ----> C2Cl6 + 6HCl
Thanks, what about this question

Write down three possible products, other than chloromethane form the photochemical reaction between CH4 and CL2
0
reply
Aleksander Krol
Badges: 13
Rep:
? You'll earn badges for being active around the site. Rep gems come when your posts are rated by other community members.
#6
Report 4 months ago
#6
(Original post by Alevelhelp.1)
Thanks, what about this question

Write down three possible products, other than chloromethane form the photochemical reaction between CH4 and CL2
there are 4 H atoms in CH4
so we can get 4 possible products
1st is chloromethane by removing 1 H atom
but they didn't ask for this so they are askimg for the remaining 3 products other than this.
2nd is dichloromethane by removing 2 H atoms and substituting with Cl atoms
3rd is trichloromethane by removing 3 H atoms and substituting with Cl atoms
4th is tetrachloromethane by removing 4 H atoms (all H atoms from CH4) and substituting with Cl atoms
Last edited by Aleksander Krol; 4 months ago
0
reply
X

Quick Reply

Attached files
Write a reply...
Reply
new posts
Back
to top
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise

Were exams easier or harder than you expected?

Easier (21)
27.27%
As I expected (23)
29.87%
Harder (29)
37.66%
Something else (tell us in the thread) (4)
5.19%

Watched Threads

View All
Latest
My Feed

See more of what you like on
The Student Room

You can personalise what you see on TSR. Tell us a little about yourself to get started.

Personalise