1. REDOX with nitric acid
   1. copper
      1. unreactive
         1. not react with dilute acid
      2. concentrated nitric acid
         1. reacts
   2. copper + conc. nitric acid ---> copper (II) nitrate + water + nitrogen dioxide
   3. Cu + 4HNO3 ---> Cu(NO3)2 + H2O + 4NO2
      1. nitogen reduced
      2. copper oxidised
2. copper compounds
   1. coloured
      1. green
      2. blue
   2. hydroxide
      1. copper sulphate + sodium hydroxide ---> copper (II) hydroxide + sodium sulphate
      2. CuSO4 (aq) + 2NaOH (aq) ---> Cu(OH)2 (s) + Na2SO4 (Aq)
   3. oxygen
      1. 2Cu (s) + O2 (g) ---> 2CuO(s)
         1. copper(II)oxide
   4. dilute acid
      1. solutions of salts produced
      2. hydrochloric
         1. copper(II) oxide + hydrochloric acid ---> copper (II)chloride + water
         2. cuO (s) + 2HCl (aq) ---> CuCl2 (aq) + H2O (l)
            1. green solution
      3. nitric
         1. copper(II) oxide + nitric acid ---> copper(II)nitrate + water
         2. CuO(s) + 2HNO3(aq) ---> CuSO4(aq) + H2O(l)
            1. blue solution
      4. sulphuric acid
         1. copper(II) oxide + sulphuric acid ---> copper sulphate + water
         2. CuO(s) + H2SO4 (aq) ---> CuSO4 (Aq) + H2)
         3. copper sulphate
            1. dry
            2. white powder
            3. htdrated
            4. blue powder
            5. test for water
   5. decomposition with heat
      1. copper carbonate
         1. CuCO3(s) ---> CuO(s) + CO2(g)
      2. copper nitrate
         1. 2Cu(NO3)2(s) ---> 2CuO(s) + 4NO2(g) + O2(g)
3. copper(II) ions + ammonia
   1. copper sulphate solution
   2. react with alkalis
   3. ammonia
      1. copper (II) hydroxide
         1. blue green precipitate
   4. copper (II) hydroxide + ammonia
      1. precipitate dissolve
      2. deep blue solution
      3. [Cu(H2))2(NH3)4]2+
         1. complex ion
         2. copper
         3. ammonia
         4. water
4. Copper (I) Compounds
   1. copper (I) oxide
      1. red brown colour
      2. Cu2O