SCIENCE

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Across
  1. 1. / An indivisible and basic unit of matter
  2. 6. / It is the study of matter and the changes it undergoes
  3. 9. / The centre of an atom is called ____
  4. 10. / NH3
  5. 12. / Unit of measurement of time
  6. 13. / Blue litmus paper turns ____ under acidic conditions
Down
  1. 2. / The only metal that is in liquid form at room temperature
  2. 3. / It is defined as mass divided by volume
  3. 4. / The mechanical process to separate solids from the fluids
  4. 5. / The process through which a substance changes from liquid to solid
  5. 7. / A strong base that dissovels in water
  6. 8. / Positive ions are called _____
  7. 11. / Anything that has mass and occupies volume