Write down the reaction equations with which you can carry out the transformation: A) potassium

Write down the reaction equations with which you can carry out the transformation: A) potassium – potassium hydroxide – potassium carbonate – potassium nitrate – potassium sulfate; B) zinc – zinc chloride – zinc hydroxide – zinc oxide – zinc nitrate; B) copper – copper oxide (II) – copper sulfate – copper hydroxide – copper oxide – copper chloride; D) carbon – carbon dioxide – sodium carbonate – calcium carbonate – carbon dioxide.

A) potassium → potassium hydroxide → potassium carbonate → potassium nitrate → potassium sulfate

K → KOH → K2CO3 → KNO3 → K2SO4

1) 2K + 2H2O → 2KOH + H2 ↑;

2) 2KOH + H2CO3 → K2CO3 + 2H2O;

3) K2CO3 + Ba (NO3) 2 → BaCO3 ↓ + 2KNO3;

4) 2KNO3 + H2SO4 (conc.) → K2SO4 + 2HNO3.

B) zinc → zinc chloride → zinc hydroxide → zinc oxide → zinc nitrate

Zn → ZnCl2 → Zn (OH) 2 → ZnO → Zn (NO3) 2

1) Zn + Cl2 → ZnCl2;

2) ZnCl2 + 2NaOH → Zn (OH) 2 ↓ + 2NaCl;

3) Zn (OH) 2 → ZnO + H2O;

4) ZnO + 2HNO3 → Zn (NO3) 2 + H2O.

B) copper → copper (II) oxide → copper sulfate → copper hydroxide → copper oxide → copper chloride

Cu → CuO → CuSO4 → Cu (OH) 2 → CuO → CuCl2

1) 2Cu + O2 → 2CuO;

2) CuO + SO3 → CuSO4;

3) СuSO4 + 2KOH → Cu (OH) 2 ↓ + K2SO4;

4) Cu (OH) 2 ↓ → CuO + H2O;

5) CuO + 2HCl → CuCl2 + H2O.

D) carbon → carbon dioxide → sodium carbonate → calcium carbonate → carbon dioxide

C → CO2 → Na2CO3 → CaCO3 → CO2

1) С + O2 → CO2 ↑;

2) CO2 + Na2O → Na2CO3;

3) Na2CO3 + CaCl2 → 2NaCl + CaCO3 ↓;

4) СaCO3 ↓ → CaO + CO2 ↑.