| Question |
Answer |
| 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 |
500 Words
