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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.
In science, a process that is not reversible is called irreversible. This concept arises frequently in thermodynamics. In thermodynamics, a change in the thermodynamic state of a system and all of its surroundings cannot be precisely restored to its initial state by infinitesimal changes in some property of the system without expenditure of energy.