| Flap 1 | Flap 2 |
| matter | the stuff that makes up everything in the universe |
| characteristic property | a quality of a substance that never changes and can be used to identify the substance |
| boiling point | the point at which a substance changes from a liquid to a gas |
| melting point | the temperature at which a substanace changes from a solid to a liquid |
| physical change | a change in a substance that does no change it's identity; for example a change of state |
| chemical change | a change in which one or more a substances combine or breck apart to form new substances |
| chemical activity | a characteristic property of a substance that indicates it's ability to undergo a specific chemical change |
| mixture | two or more substances that are mixed togeather, but not chemically combined |
| solution | a very well mixed mixture |
| pure substance | a substance made of only one kind of matter and having definite properties |
| element | a substance that cannot be broken down into other substances by chemical or physical means |
| element | a substance that cannot be broken down into other substances by chemical or physical means |
| compound | a substance made of two or more elements chemically combined |
| weight | a measure of the force of gravity on an object |
| mass | a measurement of how much matter is in an object |
| international system of units (SI) | the system of units used by scientists to measure the properties of matter. (also IU) |
| volume | the amount of space that matter occupies l x w x h = v |
| density | the measurement how much mass of a substance is contained in a given volume d = m/v |
| atom | the smallest particle of an element |
| molecule | a combination of two or more atoms |
| chemical bond | the force that holds two atoms together |
