Question
Define the terms:
(i) Chemical energetics
(ii) Thermochemistry.
Solution
(i) Chemical energetics: It is the branch of chemistry that deals with energy changes during various physical processes and chemical reactions. These energy changes may be in the form of heat, light, electricity or mechanical work.
For example:
(a) Heat energy is liberated when carbon burns in air together with a glow of light.
(b) Magnesium ribbon when burnt in air produce mainly light energy.
(c) The redox reaction between Zn and CuSO4 carried out indirectly in Daniel cell produces electrical energy.
(ii) Thermochemistry: It is the branch of chemistry that deals with the heat changes accompanying chemical reactions.
For example:
(a) Heat energy is liberated when carbon burns in air together with a glow of light.
(b) Magnesium ribbon when burnt in air produce mainly light energy.
(c) The redox reaction between Zn and CuSO4 carried out indirectly in Daniel cell produces electrical energy.
(ii) Thermochemistry: It is the branch of chemistry that deals with the heat changes accompanying chemical reactions.
