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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.
An exothermic reaction releases heat into the surroundings, and an endothermic reaction absorbs heat from the surroundings. Frying an egg is an example of an endothermic process because the egg solidifies as it absorbs heat from the frying pan. A common example of an exothermic reaction is combustion in the form of a bonfire -- anyone near the flames can readily determine that the fire is releasing heat into the surroundings.