C2 v2

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Across
  1. 3. Another name for a salt solution (5)
  2. 4. A low density, strong metal used for aircraft (8)
  3. 6. The element with chemical symbol H (8)
  4. 9. Calcium _________ is formed by heating limestone (5)
  5. 10. The loss of electrons (9)
  6. 12. Fertilisers supply plants with __________ elements (9)
  7. 14. A metal which rusts (4)
  8. 15. The gain of electrons (9)
  9. 18. The layer below the crust (6)
  10. 19. Calcium _________ contains OH- ions (9)
  11. 21. The element with chemical symbol N (8)
  12. 22. When magma cool slowly underground (9)
  13. 23. A substance with pH less than 7 (4)
Down
  1. 1. Added to iron to make steel (6)
  2. 2. The outer layer of the Earth (5)
  3. 4. This technique used a burette (9)
  4. 5. An ion which contains nitrogen (7)
  5. 7. The chemical name for salt is sodium __________ (8)
  6. 8. Made by mixing cement with sand, water and aggregate (8)
  7. 11. Small bits of limestone used in railways (9)
  8. 12. When lava cools quickly on the surface (9)
  9. 13. An ion contain phosphorous (9)
  10. 16. The chemical name for limestone is calcium ____________ (9)
  11. 17. Rusting is an example of this (9)
  12. 20. The compound with formula NH3 (7)