Chemistry Paper 2

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Across
  1. 3. Test used to compare sustainability of products
  2. 11. A factor that increases the rate of reaction without being used up
  3. 12. Gas that turns limewater cloudy
  4. 13. A reaction that gives out heat
  5. 16. Test for chlorine gas – turns damp litmus this colour
  6. 18. Increasing this factor means more particles in a given volume
  7. 20. Substance made from small molecules joining together
  8. 21. Process of breaking long-chain hydrocarbons into shorter, useful ones
  9. 23. Desalination removes this from seawater
  10. 24. Flame test colour for sodium ions
  11. 26. Monomers with double bonds used to make addition polymers
  12. 28. Name for gases that trap heat in atmosphere
  13. 31. Gas linked to acid rain
  14. 35. Metal that is low density and resists corrosion
  15. 37. Main gas in Earth’s atmosphere
  16. 38. Gas produced by incomplete combustion
  17. 39. General formula for alkanes
  18. 40. What shifts the position of equilibrium when conditions change
Down
  1. 1. Hydrocarbon containing a double bond
  2. 2. The minimum energy particles need to react
  3. 4. White precipitate formed with calcium ions and sodium hydroxide
  4. 5. Gas increasing in atmosphere due to fossil fuel combustion
  5. 6. Hydrocarbon containing only single bonds
  6. 7. Term for long-term changes in global weather patterns
  7. 8. Method used to separate coloured dyes in ink
  8. 9. Flame test colour for copper ions
  9. 10. Human activity increasing methane in atmosphere: _______ farming
  10. 14. Reusing and processing waste materials
  11. 15. Alloy made of iron and carbon
  12. 17. Method of sterilising water using gas
  13. 19. What factor increases by reducing particle size
  14. 22. Flame test colour for potassium ions
  15. 25. Second most abundant gas in Earth’s atmosphere
  16. 27. Reversible reactions reach this state when forward and backward reactions balance
  17. 29. Increasing this increases the average energy of particles
  18. 30. Reaction where alkenes react with bromine water, decolourising it
  19. 32. Test for hydrogen gas – produces this sound
  20. 33. Alcohols react with oxygen to form water and this gas
  21. 34. Gas needed in the Haber Process with nitrogen to make ammonia
  22. 36. Natural material used to make glass