Chemistry

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