| A | B |
| Compound | A substance formed when atoms of 2 or more different elements join together |
| molecule | 2 or more atoms held together in a special way |
| atom | the smallest whole bit of an element |
| element | matter that has only one kind of atom |
| mass | the amount of material that an object has in it |
| volume | the amount of space that matter takes up |
| mixture | 2 or more substances that are placed together but can be easily separated |
| solution | a mixture in which one substance spreads evenly throughout another substance |
| meter | a unit for measuring length |
| centimeter | 1/100 of a meter |
| millimeter | 1/1000 of a meter |
| kilometer | 1,000 meters |
| cubic | unit for measuring volume |
| liter | a unit for measuring volume |
| milliliter | 1/1,000 of a liter |
| graduated cylinder | a piece of equipment used for measuring the volume of liquids |
| gram | 1/1000 of a kilogram |
| density | how much mass is in a certain volume of matter |