Chemistry

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Across
  1. 3. Obtained from plants to make paper
  2. 4. _________ of salinity in sea water
  3. 6. Solid to gas
  4. 10. Symbol of lead
  5. 11. Harmful substances in water
  6. 13. Total number of elements known
  7. 15. Method used to separate pebbles from fine sand
  8. 16. __________% of freshwater on earth
  9. 18. Forms the basis of many synthetic fibres
  10. 19. Also known as parametal
  11. 21. Type of chemists
Down
  1. 1. Earth is often referred to as _____
  2. 2. Carbon atomic number
  3. 5. Example of pesticide
  4. 7. Contains penicillin and tetracycline
  5. 8. An irregular and random motion of gas and liquid molecules
  6. 9. Used in temperature checking
  7. 12. Proposed atomic theory of matter
  8. 14. ______ litres of water needed to make 2 and a half sheets of paper
  9. 17. Used in rubbers for elasticity
  10. 18. ______ water is fit for drinking
  11. 20. Bromine exist as solid/liquid/gas
  12. 21. Symbol of silver