Complete the equation CA + H2 → Mg + H2SO4 → Na + HCE → CU + ZnSO4 →

The reaction takes place between substances such as calcium and hydrogen. As a result of the reaction, a substance called calcium hydride is formed. The molecular equation of the reaction can be written as follows:

Ca + H2 = CaH2

We compose the equation of electronic balance.

Ca – 2e = Ca 2+ reducing agent, therefore oxidizes.

H2 + 2 e = 2 H + oxidizing agent, therefore reducing agent.

The reaction takes place between substances such as magnesium and sulfuric acid. As a result of the reaction, a substance is formed: a salt of magnesium sulfate and hydrogen is released. The molecular equation of the reaction can be written as follows:

Mg + H2SO4 = MgSO4 + H2

We compose the equation of electronic balance.

Mg – 2e = Mg 2+ reducing agent, therefore oxidizes.

2 H + + 2e = H2 oxidizing agent, therefore reducing agent.

Sodium react with hydrochloric acid. As a result of this interaction, sodium chloride salt is formed and hydrogen is released. Graphically, this equation of a chemical reaction can be written as follows:

2 Na + 2 HCl = 2 NaCl + H2

We compose the equation of electronic balance.

Na – 1 e = Na + reducing agent, therefore it is oxidized.

2 H + + 2 e = H2 oxidizing agent, therefore reducing agent.

Reaction between copper and zinc sulfate. As a result of the exchange reaction, pure zinc and a copper sulfate salt are formed. The molecular equation of the reaction can be written as follows:

Cu + ZnSO4 = Zn + CuSO4

We compose the equation of electronic balance.

Cu – 2 e = Cu2 + reducing agent, therefore it is oxidized.

Zn 2+ + 2 e = Zn is an oxidizing agent, therefore a reducing agent.