Question

Why light reaction is called photochemical reaction and dark reaction is called as thermochemical reaction?

Answer 1

Hey dear....

Here is your answer....

THERMOCHEMICAL REACTIONS :-

These reactions involve absorption or evolution of heat.

They can take place even in absence of light i.e. dark.

Temperature has significant effect on the rate of a thermochemical reaction.

The free energy change ∆G of a thermochemical reaction is always negative.

They are accelerated by the presence of a catalyst.

PHOTOCHEMICAL REACTIONS :-

These reactions involve absorption of light.

The presence of light is the primary requisite for the reaction to take place.

Temperature has very little effect on the rate of a photochemical reaction. Instead, the intensity of light has a marked effect on the rate of a photochemical reaction.

The free energy change ∆G of a photochemical reaction may not be negative.

Some of these are initiated by the presence of a photosensitizer. However a photosensitizer acts in a different way than a catalyst.

Hope it helps you!!!!!

Answer 2

Answer:

These reactions involve absorption or evolution of heat. They can take place even in absence of light i.e. dark. Temperature has significant effect on the rate of a thermochemical reaction. ... Instead, the intensity of light has a marked effect on the rate of a photochemical reaction.