element - matter made of one atom like Gold, mixture - made up of two or more elements or compounds, compound - two or more elements chemically combined, atom  - the smallest unit of an element, chemical change - substances combine to make a new substance that can not be undone, chemical change examples - camp fire, explosion , physical change examples - boiling water , compound examples: - water salt, sugar, mixture examples: - salad, Pepsi, coffee,

Chemistry

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