Ответ:

Задание 2

1. Na2SO4

2. K2SO4

3. Ba(OH)2

4. KOH

5. SO2

6. H2S

7. Zn(OH)2

Задание 3

1. Zn + H2S = ZnS + H2

2. Ba(OH)2 + 2HCl = BaCl2 + 2H2O

3. NaO + H2O = NaOH + O2

4. Na + H2O = NaO + H2

5. NaOH + H3PO4 = Na3PO4 + 3H2O

6. Ca + O2 = CaO

7. 2Al + 6HCl = 2AlCl3 + 3H2