S2 Environmental Chemistry

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Across
  1. 9. the rocks that are formed from other rocks that are changed because of heat and pressure
  2. 10. this causes the acid or alkali's pH to move towards 7
  3. 14. when an acid and alkali are combined to give a pH or 7
  4. 16. the type of indicator that shows acids as red, alkalis as blue and neutral substances as green
Down
  1. 1. deterioration of a metal as a result of chemical reactions with the environment
  2. 2. the rocks that are formed when hot liquid rock (magma or lava) cools and hardens
  3. 3. when rocks get eroded, form layers as sediments, get buried and squashed together
  4. 4. rocks containing compounds of metals (5,3)
  5. 5. contain nitrogen, phosphorous, potassium and help plants grow
  6. 6. a measure of how acidic or alkaline a substance is
  7. 7. reactions that occur when a more reactive metal displaces a less reactive metal
  8. 8. corrosion of iron
  9. 11. have a pH of 7
  10. 12. the indicator used to test for rust
  11. 13. have a pH more than 7
  12. 15. have a pH less than 7