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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.
Exothermic chemical reactions liberate heat. A simple and familiar example is the combustion of methane gas (CH 4). The balanced chemical reaction for this process is: CH 4 (g) + 2 O 2 (g) CO 2 (g) + 2 H 2 O(g). We could write heat as one of the products on the right (products) side of the reaction if we wished.