19
QuizMultiple Choice

The Energy of Chemical Reactions — Test

Question 19 • 26-27 - C - RUSD Chemistry in the Earth System

Which statement best describes the reaction pathway graph for an exothermic reaction but not an endothermic reaction?

Answer
A
The products are higher in energy than the reactants.
B
It has a valley in the middle that is its lowest point.
C
The reactants are higher in energy than the products.
D
It has a hill in the middle that is the highest point.

Explanation

In an exothermic reaction, energy is released, so the products end up at a lower energy than the reactants. Therefore, the reactants are higher in energy than the products, which is choice A. Endothermic reactions have the opposite energy relationship. Both types of reaction pathways can have a hill representing activation energy, so that feature does not distinguish them.

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