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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.
A chemical change takes place when chlorophyll breaks down into new. substances. This change is an example of a chemical reaction. A. chemical reaction is a process in which one or more substances. change to make one or more new substances. The chemical and. physical properties of the new substances differ from those of the. original substances. Some results of chemical reactions are shown in.