3.3 Types of chemical reactions

Aluminium reacts with copper(II) ions in solution.

\mathrm{2Al + 3Cu^{2+} \rightarrow 2Al^{3+} + 3Cu}

Which option shows the correct half equations for the oxidation and the reduction?

[1]

Oxidation: $Al→Al3++3e−\mathrm{Al \rightarrow Al^{3+} + 3e^{-}}$ ; Reduction: $Cu2++2e−→Cu\mathrm{Cu^{2+} + 2e^{-} \rightarrow Cu}$

Oxidation: $Cu2++2e−→Cu\mathrm{Cu^{2+} + 2e^{-} \rightarrow Cu}$ ; Reduction: $Al→Al3++3e−\mathrm{Al \rightarrow Al^{3+} + 3e^{-}}$

Oxidation: $Al+3e−→Al3+\mathrm{Al + 3e^{-} \rightarrow Al^{3+}}$ ; Reduction: $Cu2+→Cu+2e−\mathrm{Cu^{2+} \rightarrow Cu + 2e^{-}}$

Oxidation: $2Al→2Al3++3e−\mathrm{2Al \rightarrow 2Al^{3+} + 3e^{-}}$ ; Reduction: $3Cu2++3e−→3Cu\mathrm{3Cu^{2+} + 3e^{-} \rightarrow 3Cu}$

Aluminium reacts with copper(II) ions in solution.

\mathrm{2Al + 3Cu^{2+} \rightarrow 2Al^{3+} + 3Cu}

Which option shows the correct half equations for the oxidation and the reduction?

Oxidation: $Al→Al3++3e−\mathrm{Al \rightarrow Al^{3+} + 3e^{-}}$ ; Reduction: $Cu2++2e−→Cu\mathrm{Cu^{2+} + 2e^{-} \rightarrow Cu}$

Oxidation: $Cu2++2e−→Cu\mathrm{Cu^{2+} + 2e^{-} \rightarrow Cu}$ ; Reduction: $Al→Al3++3e−\mathrm{Al \rightarrow Al^{3+} + 3e^{-}}$

Oxidation: $Al+3e−→Al3+\mathrm{Al + 3e^{-} \rightarrow Al^{3+}}$ ; Reduction: $Cu2+→Cu+2e−\mathrm{Cu^{2+} \rightarrow Cu + 2e^{-}}$

Oxidation: $2Al→2Al3++3e−\mathrm{2Al \rightarrow 2Al^{3+} + 3e^{-}}$ ; Reduction: $3Cu2++3e−→3Cu\mathrm{3Cu^{2+} + 3e^{-} \rightarrow 3Cu}$

3.3 Types of chemical reactions Questions