| A | B |
|---|
| matter | anything that has mass and takes up space |
| chemistry | the study of the properties and changes of matter |
| substance | a single kind of matter that is pure and has a specific set of properties |
| physical property | can be observed without changing a substance into another substance |
| chemical property | the ability of a substance to change into a different substance |
| element | a pure substance that cannot be broken down into any other substance |
| atom | the basic particle of an atom |
| chemical bond | a force of attraction between two atoms |
| molecule | a particle formed when two or more atoms are held together by chemical bonds |
| compound | a pure substance made of two or more elements chemically combined in a set ratio |
| chemical formula | shows the elements in the compound and the ratio of atoms |
| mixture | two or more substances together in the same place but are not chemically combined |
| heterogeneous mixture | the different parts can be seen |
| homogeneous mixture | parts are so evenly mixed they cannot be seen |
| solution | homogeneous mixture |
| weight | the force of gravity on an object |
| mass | how much matter an object contains |
| volume | the amount of space that matter occupies |
| density | relates the mass and volume of an object |
| International System of Units | system used to measure the properties of matter |
| physical change | matter changes its appearance but does not change into a different substance |
| chemical change | matter changes into one or more new substances |
| law of conservation of mass | matter is not created or destroyed in any chemical or physical reaction |
| energy | the ability to do work or cause change |
| temperature | the measure of the average energy of random motion of the particles in an object |
| thermal energy | total energy of all the particles in an object |
| endothermic change | a change in which energy is taken in, or absorbed |
| exothermic change | a change in which energy is released, or given off |
| hetero- | different, other |
| homo- | same, alike |
| endo- | in, into, within |
| exo- | out of, away from |
| therm- | heat |
| kilo- | thousand |
