1. Consider molecular, complete ionic, and net ionic equations.

What is the difference between these types of equations?

2. Balance the following equations:

(i) Cu(s) + HNO3(aq) Cu(NO3)2(aq) + H2O(l) + NO(g)

(ii) Fe(s) + O2(g) Fe2O3(s)

(iii) Na(s) + H2O(l) NaOH(aq) + H2(g)

(iv) (NH4)2CrO7(s) Cr2O3(s) + N2(g) + H2O(g)

3. Assign oxidation numbers to all atoms in each of the following molecules/ions. Show all calculations.

(a) SO3 2- (2) (b) Na2SO4

4. Consider the following chemical reactions:

(i) C2H4(g) + 3O2 2CO2(g) + 2H2O(g) (2) (ii) 2K2S2O3 + I2 K2S4O6(s) + 2KI

(a) Identify the reducing agent and,

(b) the oxidizing agent in each of the reactions above.

Motivate your answers.

5. Balance the following redox equations using the half-reaction method

(a) ClO3 - (aq) + MnO2(s) Cl- (aq) + MnO4 - (aq) (basic medium)

(b) Ag+ (aq) + NO (g) Ag(s) + NO3 (g) + Ag+ (aq) (acid medium)