Question

The following graph represents the energy consumption of a reaction. What kind of change is it?

• A. Periodic change
• B. Physical change
• C. Endothermic reaction
• D. Exothermic reaction

Answer 1

Answer: (D)

Exothermic reaction

Some initial energy is required to initialize reaction but later a large amount of heat is released which is shown by negative heat ($\Delta h$) in graph. Hence reaction is exothermic reaction.