2. Mg + N 2  Mg 3 N 2 Pb + Ag +  Pb 2+ + Ag Magnesium metal is burned in nitrogen Lead foil is immersed in silver nitrate A solution of ammonium sulfate is added to a saturated solution of barium hydroxide Acetic acid is added to a solution of sodium hydrogen carbonate Practice HC 2 H 3 O 2 + HCO 3 1-  H 2 O + CO 2 NH 4 + + SO 2+ + Ba 2+ + OH -  BaSO 4 + NH 3 + H 2 O

3. Na 2 Cr 2 O 7 2- + I -  Cr 3+ + I 2 + Na + CH 3 CH 2 OH + O 2  CO 2 + H 2 O H 2 + Fe 2 O 3  Fe + H 2 O Solid sodium dichromate is added to an acidified solution of sodium iodide Ethanol is completely burned in air Hydrogen gas is passed over hot iron III oxide Solutions of potassium iodide and potassium iodate are mixed in an acid solution I - + IO 3 -  I 2

4. H + + HSO 4 - + CaF 2  CaSO 4 + HF H 2 O 2 + Br -  H 2 O + Br 2 Dilute sulfuric acid is added to solid calcium fluoride Solid ammonium carbonate is heated Hydrogen peroxide is added to an acidified solution of sodium bromide Dilute hydrochloric acid is added to a dilute solution of mercury I nitrate Cl - + Hg 2 2+  Hg 2 Cl 2 (NH 4 ) 2 CO 3  NH 3 + H 2 O + CO 2

5. H + + HCO 3 -  CO 2 + H 2 O Ca + H 2 O  Ca 2+ + OH - + H 2 Dilute sulfuric acid is added to lithium hydrogen carbonate Solid calcium is added to warm water Hydrogen sulfide is bubbled through a solution of nickel II nitrate H 2 S + Ni 2+  NiS + H +

6. [Al(OH) 4 ] - Ag + H + + NO 3 -  Ag + + NO + H 2 O OH - + H 2 PO 4 -  H 2 O + PO 4 3- Excess sodium hydroxide is added to solid aluminum hydroxide Solid silver is added to a dilute (6M) nitric acid solution Excess potassium hydroxide is added to a solution of potassium dihydrogen phosphate Hydrogen peroxide solution is added to a solution of iron II sulfate H 2 O 2 + Fe 2+  H 2 O + Fe 3+ Al(OH) 3 + OH - 

7. CH 3 CH 2 CH 2 OH + O 2  CO 2 + H 2 O Propanol is burned completely in air Solid potassium chlorate is heated in the presence of a catalyst, Manganese IV oxide KClO 3  MnO 2 KCl + O 2