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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 and endothermic reactions. When a chemical reaction occurs, energy is transferred to, or from, the surroundings-and there is often a temperature change. For example, when a bonfire burns it transfers heat energy to the surroundings.xothermic and endothermic reactions. When a chemical reaction occurs, energy is transferred to, or from, the surroundings-and there is often a temperature change. For example, when a bonfire burns it transfers heat energy to the surroundings.