In the VIEW menu, go to TEXT SIZE and click on SMALLEST. Complete the crossword, then click on "Check" to check your answer. If you are stuck, you can click on "Hint" to get a free letter. Click on a number in the grid to see the clue or clues for that number. Good luck, and I hope you learn some useful Chemistry by doing the crossword. Dr E.

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Across: 2. Strides. (5) 7. See 9 across. 9. and 7 across. Major commercial product formed by oxidising ammonia and adding water. (6,4) 11. Parent Teachers' Association. Abbreviation. (3) 12. Prefix meaning 10. (3) 13. At higher temperatures, this feature of chemical reactions increases. (4) 14. German chemist who developed an industrial process for making ammonia. (5) 16. Raw material from which nitrogen is extracted. (3) 18. Genus of moles. (5) 20. Game of chance. (5) 22. Natural gas from which hydrogen is extracted. (7) 24. The most important element required to increase food production by plants. (8) 27. Curved support. (4) 28. Description of a reversible reaction in which there is a mixture of both reactants and products. (11) 29. Gaseous water (from which hydrogen is extracted by reacting with methane). (5) 30. Product of the reaction between nitrogen and hydrogen. (7)

Down: 1. (Scientific) information. (4) 2. Greek letter. (2) 3. Opposite of remove. (3) 4. Charm. (7) 5. Symbol for silicon. (2) 6. see 19 down. 8. Role of iron in the Haber process. (8) 10. Pipe-shaped (bells?). (7) 11. The major biological polymer containing nitrogen. (7) 15. The catalyst in the Haber process. (4) 17. Indefinite article. (2) 19. and 6 down. Major fertiliser made by adding 9,7 to 30 .(8,7) 21. Not off. (2) 23. Tasty crustaceans. (6) 25. The chemical property of nitrogen, the reason extreme conditions are required to make it react. (5) 26. Girl's name. (5) 27. and 7 across. Monomer required to make protein. (5,4)