Term | Definition |
Characteristic Property | A quality of a substance that never changes and can be used to identify the substance |
boiling point | the temperature at which a substance changes from a liquid to a gas |
melting point | the temperature at which a substance changes from a solid to a liquid |
physical change | A change in a substance that does not change its identity; for example, a change of state |
chemical change | A change in which one or more substances combine or break apart to form new substances |
chemical activity | A characteristic property of a substance tht indicates its ability to undergo a specific chemical change |
mixture | Two or more substances that are misxed together but not chemically combined |
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 phyusical 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 measure of how much matter is in an object. |
International System of Units (SI) | The system of units used my scientists to measure the properties of matter |
volume | The amount of space that matter occupies |
density | The measurement of how much mass of a substance is contained in a given volume |
atom | The smallest particle of an element |
molecule | A combination of two or more atoms |
chemical bond | The force that holds two atoms together. |
ore | A rock that contains a metal or other economically useful element |
electrolysis | A process by which an electric current breaks chemical bonds |
electrode | a metal strip used in electrolysis |