| A | B |
|---|
| compound | a pure substance made up of two or more elements that are chemically combined |
| chemical formula | a group of symbols and subscripts that tell the type and ratio of atoms in a compound |
| subscript | a number written to the right of a chemical symbol and slightly below it. They tell the number of atoms of that element in a compound. |
| chemical bond | a force that holds particles of matter together |
| ion | an atom that gains or loses electrons |
| ionic bond | the force of attraction between oppositely charged ions |
| ionic compound | a compound that contains ionic bonds |
| formula unit | the smallest group of repeating atoms in an ionic compound |
| covalent bond | a bond formed by the sharing of electrons between two atoms |
| covalent compound | a compound that contains covalent bonds |
| molecule | the smallest part of a covalent substance that has the properties of that substance |
| metallic bond | the equal sharing of atoms among metal atoms |
| chemical reaction | a process in which one or more substances are changed into one or more different substances |
| reactants | the starting substances in a chemical reaction |
| products | the new substances formed in a chemical reaction. |
| precipitate | a solid product that sometimes forms when two liquids react |
| Law of conservation of Mass | a law stating that in a chemical reaction, the total mass of the reactants equals the total mass or the products |
| chemical equation | a shorthand way to show the changes that take place in a chemical reaction |
| synthesis reaction | a chemical reaction in which two or more substances combine to form a compound |
| decomposition reaction | a chemical reaction in which a compound breaks down into two or more substances |
| single replacement reaction | a chemical reaction that occurs when one element replaces another element in a compound |
| double replacement reaction | a chemical reaction that occurs when the compounds in a reaction exchange ions |
