General Science

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