Topic 9: Redox

Question 1

Deduce the half-equations for the reaction at the anode when molten magnesium chloride is electrolysed, showing the state symbols of the products.

Answer 1

2Cl^- –> Cl2(g) + 2e^-

Question 2

Deduce the half-equations for the reactions at each electrode when molten magnesium chloride is electrolysed, showing the state symbols of the products.

Answer 2

Mg^2+ + 2e^- –> Mg (l)

Question 3

Do electrons flow from the negative electrode to the positive electrode in electrolytic cells?

Answer 3

No, in electrolytic cells, the power supply supplies the electrons to the anode (positive electrode) to create a potential difference that drives the electrolysis process so therefore the electrons flow from positive electrode to negative