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With a chemical change, a substance transforms into a different substance. Most chemical changes are irreversible. For example, you cannot unbake a cake or unburn wood. However, there are some chemical changes that are reversible, such as nitrogen dioxide that is chemically changed by heat and then reforms when cooled.
1 Exergonic reactions occur spontaneously (no outside energy is required to start them). 2  Examples of exergonic reactions include exothermic reactions, such as mixing sodium and chlorine to make table salt, and chemiluminescence (light is the energy that is released).