| A | B |
|---|
| Matter | anything that has mass and takes up space |
| element | a fundamental substance that cannot be broken into simpler substances by chemical or physical processes |
| Atom | the smallest part of an element |
| physical change | a change in a substance that does not change its identity |
| chemical change | a change in which one or more substances combine or break apart to form new substances |
| compress | to reduce in volume as a result of applied pressure |
| expand | to increase in volume as a result of heating |
| conduction | the transfer of energy (heat) from one particle to another as a result of contact |
| equilibrium | a condition in which a system is experiencing no net change |
| chemical reaction | a process during which the atoms of starting substances (reactants) rearrange |
| dissolve | to mix one substance uniformly into another substance at the particle level |
| melt | to change phase from solid to liquid |
| molecule | a particle made of two or more atoms that are held together with strong bonds |
| Energy transfer | the movement of energy from one location to another |
| condensation | the change of phase from gas to liquid |
| Law of conservation of matter (or mass) | a scientific law stating that no matter is created or destroyed during a reaction |
