Write down the equation of the reaction-substitution exchange of the exchange compound

Write down the equation of the reaction-substitution exchange of the exchange compound, decomposition using such substances as: CaO, sulfur oxide 4, potassium oxide, sulfuric acid, water, magnesium.

Let’s write down the formulas of these substances: calcium oxide – CaO; sulfur oxide (IV) – SO2; potassium oxide – K2O; sulfuric acid – H2SO4; water – H2O; magnesium – Mg.

1) Mg +2 H2O = Mg (OH) 2 + H2, this reaction belongs to substitution reactions, because: a simple and complex substance enters into the reaction and the atoms of a simple substance replace atoms in a molecule of a complex substance, a new simple and new complex substance is formed …

2) CaO + SO2 = CaSO3 – this is a compound reaction, since two substances enter into the reaction. And one new substance is formed.

3) К2О + Н2SO4 = К2SO4 + Н2О is an exchange reaction, because two complex substances enter into the reaction, which exchange their constituents and two new complex substances are formed.

4) 2 H2O = 2 H2 + O2 is a decomposition reaction, since two new substances are formed from one complex substance.