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| Coefficent | Number that is placed in front of a symbol or a formula in a chemical equation that indicates how many atoms or molecules of a substance are involved in the reaction. |
| chemical equation | expression in which symbols, formulas, and numbers are used to represent a chemical reaction. |
| subscript | number placed to the lower right of a chemical symbol to indicate the number of atoms of elementsin the compound. |
| chemical formula | combination of chemical symbols usually used to represent a compound. |
| molecule | structure made up of two or more atoms. |
| compound | substance made up of molecules that cotain more than one kind of atom;two or more elements chemical combined. |
| Chemical symbol | shorthand way of representing an element. |
| atom | small particles of an element that has all the propoties of that element. |
| element | simplest type of pure substance. |
| Pure substances | substance made of one kind of material having definite properties. |
