6
QuizMultiple Choice

Reaction Pathways — Quiz

Question 6 • 26-27 - C - RUSD Chemistry in the Earth System

Which statement best describes how to read a reaction pathway graph for an endothermic reaction?

Answer
A
Reactants release a minimum amount of energy and then absorb a larger amount of energy as products form.
B
Reactants release a minimum amount of energy and then absorb a smaller amount of energy as products form.
C
Reactants absorb a minimum amount of energy and then release a larger amount of energy as products form.
D
Reactants absorb a minimum amount of energy and then release a smaller amount of energy as products form.

Explanation

An endothermic reaction has products at a higher energy than the reactants, so it absorbs energy overall. On the pathway graph, the reactants first absorb energy to reach the peak, then release energy as the products form; that release is smaller than the amount absorbed. Thus, the best description is that the reactants absorb a minimum amount of energy and then release a smaller amount.

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