During a chemical reaction, what always occurs is a change in energy. Chemical reactions involve the breaking and forming of bonds, which typically involves the release or absorption of energy. While changes in shape, color, and state can occur during some chemical reactions, they are not universal to all reactions. Therefore, the correct answer is a change in energy.
What always occurs during a chemical reaction?
A change in shape.
A change in color.
A change in state.
A change in energy.
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