OCR Gateway Science

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Across
  1. 1. Copper and what other metal make up brass?
  2. 7. A reaction where the mix gets colder
  3. 8. The charge on anything attracted to an anode
  4. 10. Limestone is used to make this building material
  5. 12. The more dense type of tectonic plate
  6. 13. The gas given off at the cathode during electrolysis of sea water
  7. 14. Iron does but aluminium doesn't
  8. 15. A reaction where bonds are formed (E.g. making ammonia)
  9. 19. The kind of substance with pH10
  10. 20. A combination of two materials using properties of both
Down
  1. 2. The kind of chemical bond where electrons are shared
  2. 3. The chemical name for limestone
  3. 4. _____ and water are needed to make iron rust
  4. 5. The gas given off at the anode during electrolysis of sea water
  5. 6. An alloy of lead and tin
  6. 7. The things that are gained during reduction
  7. 9. Aluminium has a lower what than steel?
  8. 11. Chemical symbol for sodium
  9. 16. When something loses electrons in a reaction
  10. 17. What is needed to break down carbonates
  11. 18. The catalyst used in the Haber Process (making ammonia)
  12. 21. What appears during any 'precipitation' reaction