Write chemical equations for reactions taking place when:
1.Cinnabar is heated in air.
2.Concentrated sulphuric acid and sulphur are heated together.
3.Calcium metal reacts with water
1.Chemical reaction:
2.2H2SO4 + S - 3SO2 + 2H2 (Redox reaction).
3.Ca + 2HaO - Ca(OH)2 + 2H2.