Write the reaction equation: Co-cu -cu (No3) 2-cu (oH)

1) The thermal decomposition of copper (II) oxide to produce copper and oxygen:
2CuO = (t-1100C) => 2Cu + O2;
Substitution reaction between copper (II) oxide and hydrogen to form copper and water:
CuO + H2 => Cu + H2O;

2) The substitution reaction between metallic copper and nitric acid with the formation of copper (II) nitrate, nitrogen (IV) oxide and water:
Cu + 4HNO3 => Cu (NO3) 2 + 2NO2 ↑ + 2H2O;

3) The reaction of ion exchange between copper (II) nitrate and alkali with the formation of copper (II) hydroxide and sodium nitrate:
Cu (NO3) 2 + NaOH => Cu (OH) 2 ↓ + 2NaNO3.