Chemistry (Helpz :D)

I got this reaction which I need to explain a bit..

I got 2 glasses with Cyclohexane and Di-Bromine. One of them we warp together with some paper so no light or air can enter..
The second one with only close for air - and we take this one and use powerful light on it for 5mins.

The one that didn't get light is still the same..
The second one has a new structur.. It's now Cyclohexene This is because of a substitution-reaction..

My question is... What does the light do since the substitution only happens when it gets light?

Thanks.. Couldn't get a decent answer any other places yet.
Comments
8
use your books and pay attention in the class
did you know that pH of date juice is around 6pH?
btw how do you WARP with paper?
So you got cyclohexane and you got di-bromine.

One of them becomes cyclohexane ...wat

E: attempt: The light provides energy. The energy is needed for the reaction to occur.
imo it's Elimination reaction instead of substitution and the other one becomes cyclohexene due the heat of the light. not sure though, long time since i last studied chemistry.
The light is the needed energy that splits the brom into two radicals which react with the cyclohexane ( not sure though )
QuoteThe light is the needed energy


agree with this part, don't know anything about the rest:P

edit: dunno the english word, but isnt it possible the light works as a catalysator or so witch just make the reaction take place faster. because u only took about 5 min to research ur shit:P?
Parent
Well i cant really tell u much about it since its a long time ago when i had chemistry but i know that the reaction wouldnt have taken place without the light.
These radicals are highly reactive and need light ( UV ) or just heat to react... in this case they had light :)
Parent
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