Module 1 revision

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Across
  1. 6. H2SO4
  2. 7. A chemical which has a pH less than 7
  3. 10. A type of reaction where the chemical breaks down with heating
  4. 11. NH3
  5. 12. Cl-
  6. 13. A scale that shows the strength of acids and alkalis
  7. 15. A reaction between acids and alkalis which react together to make a solution of water at pH 7
  8. 16. HCl
  9. 18. SO42-
  10. 19. A reaction that gives out energy to the surroundings
  11. 20. This is the particle that is alkali eg OH-
Down
  1. 1. A dye which changes colour depending on whether it is added to an acid or an alkali
  2. 2. NaOH
  3. 3. CO32-
  4. 4. A reaction that takes in energy from the surroundings
  5. 5. HNO3
  6. 8. This is the particle that is acid eg H+
  7. 9. NO3-
  8. 14. A substance that speeds up the rate of a reaction
  9. 17. A chemical which has a pH more than 7