| A | B |
|---|
| element | composed of only one type of atom |
| compound | composed of 2 or more different elements |
| molecule | 2 or more atoms joined together |
| atom | smallest particle of matter |
| electrons | negatively charged subatomic particle |
| ion | charged atom |
| ionic bond | formed when atoms transfer electrons |
| covalent bond | formed when atoms share electrons |
| pH | measure of acidity or alkalinity of a solution |
| H+ | symbol for hydrogen ions |
| OH- | symbol for hydroxide ions |
| pH number of 5 | H+ greater than OH- |
| pH number of 9 | H+ less than OH- |
| pH number of 7 | H+ equal to OH- |
| buffer | substance which resists changes in pH |
| C, H, O, N | makes up 96% of the body |
| water | most important INorganic substance in the body |
| salts/electrolytes | provide ions important to the body's functioning |
| solution | made up of solvent and solute |
| helps maintain homeostasis of temperature | water |
| synthesis reaction | builds up larger molecules |
