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a particle that is electrically charged (positive or negative)


two or more elements that are chemically combined


the simplest structural unit of an element or compound


the process of burning a fuel to produce thermal energy


substance that speeds up the rate of a chemical reaction


a solid that forms from solution during a chemical reaction

Physical Change

a change of matter from one form to another without a change in chemical properties

Chemical Change

a change in which one or more substances are converted into different substances


energy is absorbed


releases energy


the ability of an object to transfer heat or electricity to another object


ability of a solid to be hammered without shattering

Specific Heat

amount of heat required to increase the temperature of water


a substance present at the start of a reaction


a chemical substance formed as a result of a chemical reaction

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