Question

which statement is true of a chemical reaction?
energy is always released.
energy is not transferred.
energy is either released or absorbed.
energy is always absorbed.

Explanation:

In chemical reactions, energy can be released (exothermic) or absorbed (endothermic). So, energy is either released or absorbed, not always released or always absorbed, and energy transfer does occur in chemical reactions.

Answer:

Energy is either released or absorbed.