Across
- 1. A strong base that dissolves in water
- 2. the mechanical process to seperate solids from the fluids
- 4. Unit of meaurement of time
- 5. Posotive ions are called
- 7. an indivisible and basic unit of matter
- 8. The centre of an atom is called
Down
- 1. NH3 stands for
- 2. The process through which a substance changes from liquid to solid
- 3. It is defined as mass devided by volume
- 5. It is the study of matter and changes it undergoes
- 6. anything that has mass and occupies volume