Chemistry
Explain the term energy changes in a chemical change or reaction. Give an example with a balanced equation, for each of the following reactions:
(a) exothermic reaction
(b) endothermic reaction
(c) photochemical reaction
(d) electrochemical reaction.
Chemical Reaction
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Answer
The difference between the chemical energy of the reactants and the products is known as the energy changes in a chemical change or reaction.
Example of :
(a) exothermic reaction:
2H2 + O2 H2O + ΔT
(b) endothermic reaction:
N2 + O2 2NO - ΔT
(c) photochemical reaction:
H2 + Cl2 2HCl
Slow reaction in diffused light
Explosive reaction in direct sunlight
(d) electrochemical reaction:
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