15. Basic Chemistry: Redox Reaction

In the following unbalanced equations, indicate the reactant oxidized.

$$Al\ +\ HCl\ \rightarrow\ AlCl_3\ +\ H_2$$

Which of the following reactions are oxidation–

reduction reactions?

Predict whether the following reactions occur in aqueous solution. $$2Na+2H_2O\ \longrightarrow\ H_2+2NaOH$$

Predict whether the following reactions occur in aqueous solution. $$Fe+2H_2O\ \rightarrow\ Fe^{2+}+2OH^-+H_2$$

In an alkaline battery, the following two half reactions occur. Which reaction takes place at the anode?

The nickel–cadmium (nicad) battery is used as a replacement for a dry cell because it is rechargeable. The overall reaction that takes place is $$NiO_{2(s)}+Cd_{(s)}+2H_2O_{(l)}\ \rightarrow\ Ni(OH)_{2(s)}+Cd(OH)_{2(s)}$$

What is the half-reactions that take place at the anode and the cathode?

In basic solution, Se^2- and SO₃^2- ions react spontaneously as seen on picture. If E°_sulfite is -0.57 V, calculate E°_selenium.

A voltaic cell houses the reaction between aqueous bromine and zinc metal as shown in picture. if given E°_zinc is -0.74V, calculate E°_bromine.

Certain metals can be purified by electrolysis. For example, a mixture of Ag, Zn, and Fe can be dissolved so that the metal ions are present in an aqueous solution. If a solution containing these ions is electrolysed, which metal ion will be reduced to metal first?

In a Galvanic Cell, the charge of anode and cathode respectively are ...............