9
QuizMultiple Choice

Heat — Quiz

Question 9 • Chemistry

Which statement about exothermic reactions is accurate?

Answer
A
Thermal energy is transferred from the product to the reacting substances.
B
As reactants form products, the potential energy decreases.
C
As reactants form products, the potential energy increases.
D
Thermal energy is transferred from the surroundings to the reacting substances.

Explanation

In an exothermic reaction, energy is released to the surroundings as heat. The products therefore have less potential energy than the reactants, so the potential energy decreases as reactants form products. The accurate statement is “As reactants form products, the potential energy decreases.”

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