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Which best describes a chemical reaction?

the rearrangement of atoms by breaking and reforming chemical bonds
a reaction that absorbs heat from the surroundings
a reaction that releases heat to the surroundings
the rearrangement of molecules based on temperature and pressure

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Answered by GPT-5 mini AI
the rearrangement of atoms by breaking and reforming chemical bonds

Explanation: A chemical reaction involves making and breaking chemical bonds so atoms are rearranged into new substances. Whether it absorbs or releases heat (endothermic/exothermic) is a separate property.