What has been oxidised?

\(Cu^{2+}
+ Zn → Cu + Zn^{2+}\)

What is the oxidising agent?

\(Cu^{2+}
+ Zn → Cu + Zn^{2+}\)

What has been reduced?
\(Cl_2 + 2Na → 2Na^+ + 2Cl^-
\)

What is the reducing agent?
\(Cl_2 + 2Na → 2Na^+ + 2Cl^-
\)

What has been oxidised?
\(Cr_2O_7^{2-} + ClO_2^-
→ Cr^{3+} + ClO_4^-\)

What is the oxidising agent?
\(Cr_2O_7^{2-} + ClO_2^-
→ Cr^{3+} + ClO_4^-\)

What has been reduced?
\(Pb + Fe^{3+} → Fe^{2+} + Pb^{2+}\)

What is the reducing agent?
\(Pb + Fe^{3+} → Fe^{2+} + Pb^{2+}\)

Balance this half equation
\(Zn → Zn^{2+} \)

Balance this half equation
\(Fe^{3+} → Fe^{2+} \)

Balance this half equation
\(Cl^- → Cl_2 \)

Balance this half equation
\(O_2 → O^{2-} \)

Balance this half equation in acidic conditions
\(MnO_4^- → Mn^{2+}\)

Balance this half equation in acidic conditions
\(S_2O_3^{2-} → SO_4^{2-}\)

Balance this half equation in acidic conditions
\(Cr^{3+} → Cr_2O_7^{2-} \)

Combine these half equations
\(Ag^+ + e^- → Ag\)
\(Cu → Cu^{2+} + 2e^-\)

Combine these half equations
\(Co^{3+} + e^- → Co^{2+}\)
\(2Cl^- → Cl_2 + 2e^-\)

Combine these half equations
\(Fe → Fe^{3+} + 3e^-\)
\(MnO_4^- + 8H^+ + 5e^- → Mn^{2+} + 4H_2O\)