| A | B |
|---|
| atom | basic unit of matter |
| nucleus | at the center of the atom |
| electron | subatomic particle with a negative charge |
| neutron | subatomic particle with no charge |
| proton | subatomic particle with a positive charge |
| isotope | atoms of the same element that differ in the number of neutrons |
| compound | substance formed from chemical combinations of two or more elements |
| ionic bond | bond made when electrons are transfered |
| ion | a positively or negatively charged atom |
| covalent bond | bond formed when electrons are shared |
| molecule | structure resulting when atoms are joined together by covalent bonds |
| cohesion | attraction between molecules of the same substance |
| adhesion | attraction between molecules of different substances |
| mixture | two or more elements physically mixed together but not chemically combined |
| solution | miture where all componenets are evenly mixed |
| solute | the substance that is dissolved |
| solvent | the substance that solute dissolves in |
| suspension | mixture of water and a substance that is not dissolved |
| pH scale | indicates the concentration of H+ ions in solutin |
| acid | forms H+ ions in solution |
| base | forms OH- ions in solution |
| buffer | weak acids or bases that react with strong acids and bases to prevent sharp changes in pH |
