Question

All chemical changes involve ____ or_____ of energy.​

Answer 1

All chemical reactions involve energy. ... These reactions, called exothermic reactions, release energy. In other chemical reactions, it takes more energy to break bonds in reactants than is released when bonds form in products. These reactions, called endothermic reactions, absorb energy.

Chemical reactions often involve changes in energy due to the breaking and formation of bonds.

Reactions in which energy is released are exothermic reactions, while those that take in heat energy are endothermic.

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Answer 2

Answer:

the chemical changes involes is hydrogen of reacition to the energy