| A | B |
|---|
| element | substance containing only one type of atom |
| compound | substance made from more than one type of element where the different elements chemically bonded together |
| reaction | process in which substances change into other substances |
| molecule | particle made of two or more atoms bonded together |
| pure substances | substances which contain only only one type of crystal |
| gas | state in which particles are moving fast with lots of space between them |
| liquid | state in which particles stay close together but are able to move around each other |
| solid | state in which the particles are bonded to each other so that they cannot move around |
| melting | physical change where a substance changes from a solid to a liquid |
| evaporating | physical change in which a liquid changes into a gas |
| condensation | physical change in which a gas changes into a liquid |
| solidifying | changing from a liquid into a solid |
| colour change | one possible sign that a chemical reaction has happened |
| mixture | different pure substances mixed together |
