
(a)
Interpretation:
The type of reaction is to be determined using energy profile diagram.
Concept introduction:
Exothermic reaction: A reaction is exothermic if heat is released in the
Endothermic reaction: A reaction is endothermic if heat is absorbed in the chemical reaction.

Answer to Problem 119A
Exothermic reaction
Explanation of Solution
In exothermic reaction, energy of system after the reaction is less than energy before the reaction.
From graph it can be seen that product has less energy than reactants.
Chapter 18 Solutions
Glencoe Chemistry: Matter and Change, Student Edition
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