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Across 1. gives away 3. low reactive metal 8. the collective number of these creat a diamond under pressure 9. 2:4 C:H 10. Propane, Butane 11. yellow element 12. guess 15. group 1 period 6 16. teacher 17. very poisonous; chemical which said drove sir isaac newton 20. fizzes in water; K 21. very reactive 26. posh scientific word for chloromethane+chlorine atom reactions 27. 4:10 C:H 28. rusts 29. a good conductor 30. group 7 32. bright lighting can be coloured 33. like rubber 34. used as a fuel in jet engines 35. found in cars 36. guess 37. can be eaten to show blockages

Down 1. this solution can show starch 2. Ethene 4. sharing 5. a green gas and is poisonous 6. lighter than air 7. 6 carbon bonds and no shares 13. over 70% isfound in the air 14. DNA 17. a unit 18. used as fuel in cars 19. a form of carbon 22. (anagram) buy model num 23. used in light bulbs 24. 1:4 C:H 25. explodes with fire 29. good for your bones 31. used to make chemicals