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Physical change

A change from one state (solid or liquid or gas) to another without a change in chemical composition

Chemical change

The change of substances into other substances through a reorganization of atoms;A chemical reaction

Physical property

A characteristic that can be observed or measured without changing the identity of the substance

Chemical property

A characteristic of a pure substance that describes its ability to change into different substances

Chemical equation

A representation of a chemical reaction showing the relative numbers of reactant and product molecules


A chemical substance that is present at the start of a chemical reaction


A chemical substance formed as a result of a chemical reaction


A substance that initiates or accelerates a chemical reaction without itself being affected

Exothermic reaction

A reaction that releases heat

Endothermic reaction

A reaction that absorbs heat

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