Comments on: O Levels Chemistry – Selected Exam Questions Cont’d

By: RitikaDeb

RitikaDeb — Mon, 28 Nov 2011 17:09:42 +0000

the decomposition of H2O2 is a type of reaction which incerases in the presence of high temperature,light and even rough surface. thus i think that the rate of reaction increases.

By: paramawesome

paramawesome — Wed, 27 Oct 2010 13:48:35 +0000

I think that hydrogen peroxide is oxidized but not reduced.

In hydrogen peroxide, oxygen has an oxidation state of -1 while in O2, the oxidation state is 0. Due to the increase in oxidation state, hydrogen peroxide oxidizes

On the other hand, in hydrogen peroxide and H2O, the oxidation state for hydrogen is +1 and hence, there is no change in oxidation state.

Therefore, hydrogen peroxide is oxidized but not reduced during decomposition.

Is this method correct?

By: Wasiq

Wasiq — Mon, 11 Jan 2010 15:13:53 +0000

Question no 2 answer:
The increase in temperature will lead to increase in kinetic energy which ultimately leads to more effective collisions between molecules.

By: Tingwei

Tingwei — Sun, 27 Sep 2009 14:18:37 +0000

For question 2)
When the temperature increases,the kinetic energy of the particles also increase,and subsequently they’re able to collide more often.Thus,effective collision increases leading the increasing of ROR.Pls correct me, Sir..Thanks

By: S-N

S-N — Mon, 24 Aug 2009 00:19:11 +0000

Amended
In peroxide, O has a state of -1 while in H2O , it has a state of -2. In O2, it has a state of 0.

Hence, there is oxidation and reduction occuring at the same time.