INTRODUCTION TO CHEMISTRY

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Across
  1. 4. and Tetracycline are Antibiotics .
  2. 7. of the pencil is made of a non toxic mineral called Graphite.
  3. 8. created the periodic table
  4. 9. periodic table has been updated to include 92 naturally occuring elements and 26 synthezised elements .
  5. 12. are substances that contain sulphates of compound .
  6. 14. acid is used in cheese as a presertative .
Down
  1. 1. help to increase the production of food.
  2. 2. was the first fibre created .
  3. 3. Laurent Lavoisier identified and named Oxygen in 1778 .
  4. 5. iron pillar is made of alloy and hight quality of iron .
  5. 6. Dalton proposed the atomic theory .
  6. 9. is neither loss nor created .
  7. 10. Nairne created eraser in 1770 .
  8. 11. is the main component of Talcum powder .
  9. 13. was formed in 1941 .