"Excel IGCSE Gases in The Atmosphere Crossword": HTML5 Crossword

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4. This hot metal can be used to determine the percentage of oxygen in air (6)
5. This non-metal can be used to determine the percentage of oxygen in air (11)
6. Molecules have to be this to absorb IR radiation (5)
8. The most abundant gas in air due to its unreactivity (8)
10. A metal that rusts (4)
12. Contains only carbon and hydrogen (11)
14. Non-metal oxides are .............. (6)
16. This acid is formed when sulphur dioxide dissolves in water (10)
17. Another name for burning (10)
20. The colour of copper (II) carbonate (5)

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1. Gives a blue flame when burnt (7)
2. Least reactive gas in air (5)
3. This results from heating copper (II) carbonate (13)
7. This type of radiation is emitted from the earth's surface (8)
9. This type of high energy radiation travels from the sun (11)
11. Reacts vigorously with oxygen producing a bright white flame (9)
13. This vapour can be between 0 - 4 % of air (5)
15. The colour of copper (II) oxide (5)
18. Metal oxides are .............. (5)
19. Most reactive gas in air (6)