Chemistry paper 2 revision

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Across
  1. 2. change of state from gas-liquid
  2. 3. speeds up the rate of reaction by offering an alternative chemical pathway with a lower activation energy
  3. 7. a process used to split long chain alkanes into shorter chains
  4. 9. a pollutant produced under high temperature/pressure when nitrogen and oxygen from the air react
  5. 11. A reaction that takes in energy from its surroundings
  6. 18. caused by carbon particulates
  7. 19. causes squeaky pop when lit splint added to it
  8. 21. A reaction that gives out energy to its surroundings
  9. 22. caused by carbon dioxide
  10. 23. A molecule made up of only hydrogen and carbon atoms
  11. 24. goes cloudy in presence of CO2
  12. 25. relights a glowing splint
Down
  1. 1. the minimum energy needed for a chemical reaction
  2. 4. a pollutant that results in acid rain
  3. 5. How thick a liquid is
  4. 6. orange-colourless in present of an alkene
  5. 8. a mixture designed as a useful product
  6. 10. when increased, particles have more energy
  7. 12. a pollutant produced by incomplete combustion
  8. 13. used to separate inks in a sample
  9. 14. a catalyst used in cracking
  10. 15. increases as the molecules become larger- stronger IMF forces
  11. 16. a pollutant produced by complete combustion
  12. 17. the number of particles in a given volume
  13. 20. water that is safe to drink is called...