[MrDe]

Hello all..
Here's just a small inquiry:
If we have an exothermic equilibrium reaction (A + B  C + heat), what will happen to the forward reaction rate when temperature is increased?

We know that the equilibrium constant will decrease (Le Chatelier) and the backward reaction rate will increase.
Will the forward rate increase, decrease, or just stay the same?
thanks in advance..

[NanoHead]

the rate of reaction will increase:
think about collision theory and Boltzman distributions.. if you increase the temperature the molecules become more excited and hence collide more often in a given period of time (collision theory).. Also by increasing the energy you put into the system, you lower the activation energy required for the collision to actually occur (Boltzman distribution)

 hope that answers your question

[NanoHead]

I apolagise, the activation energy is not lower.. it is just that more molecules have enough energy to reach the Ea (activation energy)

sorry for any confusion

[juanrga]

Hello all..
Here's just a small inquiry:
If we have an exothermic equilibrium reaction (A + B   C + heat), what will happen to the forward reaction rate when temperature is increased?

We know that the equilibrium constant will decrease (Le Chatelier) and the backward reaction rate will increase.
Will the forward rate increase, decrease, or just stay the same?
thanks in advance..

What temperature? A possibility is to heat the chemical system by increasing the surround temperature (e.g. using a Bunsen burner). Then that heat is absorbed by C generating A plus B, in agreement with LeChatelier & Braun theorem. It is not clear to me, from your question, that the heat supplied is being used to increase the temperature of the chemical system and affect the forward and backward reaction (via Arrhenius law), instead of being only used to 'react' with C. I do not know the rate to which heat is absorbed by C, neither the amount of C compared with that of A and B.

In any case, the LeChatelier & Braun theorem says that the amount of A and B will increase and the forward reaction is proportional to the amount of A and B, therefore the forward rate will increase.