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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.
Physical changes are reversible (reversal is often quite easy).*. Chemical changes are not reversible (reversal is often extremely difficult). *. The chemical composition of materials is different after a chemical change but the same after a physical change. Chemical change: