Fossil fuels 1

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Across
  1. 4. Global warming can lead to this
  2. 10. Combustion is when something reacts with …
  3. 11. Alkane with two carbons
  4. 12. The suffix for alkanes (without the hyphen)
  5. 13. Alkane with six carbons
  6. 14. Coal has formed mainly from …
  7. 16. Alkane with four carbons
  8. 17. Gas, oil and coal are …
  9. 18. Alkane with three carbons
  10. 20. This effect keeps Earth warm and habitable
  11. 21. Oil and gas have formed mainly from …
  12. 22. Compounds contain a covalent carbon–hydrogen or carbon–carbon bond
  13. 24. The most important greenhouse gas
  14. 25. When an alkane reacts with oxygen, the products are carbon dioxide and …
Down
  1. 1. The most common element in Earth’s atmosphere
  2. 2. The second most important greenhouse gas
  3. 3. The chemical process of burning
  4. 5. Organic compounds made up entirely of carbon and hydrogen atoms
  5. 6. Alkane with one carbon
  6. 7. Alkane with five carbons
  7. 8. The burning of fossil fuels, farming and industry releases greenhouse …
  8. 9. How many percent of Earth’s atmosphere is oxygen?
  9. 15. The process of extracting pure substances from a liquid mixture
  10. 19. Alkane with seven carbons
  11. 21. Alkane with eight carbons
  12. 23. How many of the alkanes are gases at room temperature?