| A | B |
|---|
| metamorphic rock | rock formed when heat and pressure are applied to other rocks, they change chemical composition |
| state of matter | physical forms in which all matter naturally exists |
| chemical change | process involving one or mor substances changing into new substances |
| digestion | the process of maing food absorbable by breaking it down into simpler chemical compounds |
| periodic group | a column of elements on the periodic table, these element will have similar properties |
| alkali metals | elements in group 1A, very reactive, contain one valence eletron |
| noble gases | elements in group 8A, not reactive, contain 8 valence electrons |
| halogens | elements in gtoup 7A, very reactive, contain 7 valence electrons |
| oxidation | the loss of electrons from the atoms of a substance |
| rusting | the oxidation of iron |
