Question

which of the following correctly describes changes in energy during a chemical reaction? a energy is always absorbed during a reaction. b energy may be either absorbed or released during a reaction. c changes in energy do not occur during reactions. d energy is always released during a reaction.

Explanation:

In chemical reactions, energy can be absorbed (endothermic) or released (exothermic). For example, photosynthesis is endothermic while combustion is exothermic.

Answer:

B. Energy may be either absorbed or released during a reaction.