Sulfur and its compounds

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Across
  1. 4. with metals sulphur produces them in exothermic reactions
  2. 6. when something does not contain any water
  3. 9. it is a symmetrical molecular structure, the bond angles in it are 120 Degrees
  4. 10. it occours in volcanic gases and in thermal waters
  5. 11. the common name of calcium sulphate dihydrate
Down
  1. 1. the regular name of copper(II) sulphate pentahydrate
  2. 2. its other name is sodium sulphate, used as a laxative
  3. 3. it is oxidised when it loses electrons in the redox reaction
  4. 5. ...principle = equilibrium law: if an eqm system experiences a change, then the rate of that reaction increases, which counteracts the change
  5. 7. a substance that increases the rate of a chemical reaction without itself undergoing any permanent chemical change
  6. 8. they are very sensitive to the SO2 pollution of the air, they are bioindicator species