| A | B |
|---|
| The amount of matter in an object | mass |
| The amount of matter packed into a given space | density |
| The pull of gravity an an object | weight |
| The amount of space an object takes up | volume |
| The molecules in an object in this state are very far apart and very active | gas |
| The molecules in an object in this state are closer together, but they are active and do not hold a shape | liquid |
| The molecules in an object in this state are packed close together and are not very active | solid |
| To change an object from solid to liquid you need to apply this | heat |
| The smallest piece of an element which keeps the properties of that element | atom |
| two or more elements together | molecule |
| A property which can be tested with litmus paper | acid or base |
| A physical property | color |
| A chemical property | rusting |
| Blue litmus paper turns to pink | acid |
| Pink litmus paper turns to blue | base |
| The approximate number of known elements | 110 |
| The negatively charged part of an atom | electron |
| The positively charged part of an atom | proton |
| The subatomic particle that is neutral | neutron |
| The number of protons in an atom matches this | atomic number |
| Most substances are made of | elements bonded together |
| A chemical change | digesting food |
| The units used to measure volume | cubic units |
| A compound which is water | H20 |
| Element which can be used to make wire | copper |
| Element which is usually found in a gas state | hydrogen |
| NaCl | salt |
| Man-made material used for protection from fire or abrasion | Kevlar |
| Man-made material to which nothing sticks | teflon |
| Material used to transmit information with light | fiber optic |
