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