A lot of heat energy is usually absorbed or given out during a: physical change, chemical change, both of these, or none of these
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both of these.
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A new substance is formed in a chemical change. ... Chemical change is irreversible. 4)Very little heat or light energy is usually absorbed or given out in a physical change. A lot of heat or light energy is absorbed or given out in a chemical change.
so the answer is chemical change
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