Page 296 - SUBSEC October 2017_Neat

UNIT 1
MODULE 2: KINETICS AND EQUILIBRIA (cont’d)

Plot concentration time graph → draw tangents to obtain the rates at different concentrations
→ draw rate concentration graphs → use slope of graphs to obtain a value for the rate
constant.

3. Provide students with appropriate data to work out a variety of problems including:

(a) orders of reactions (practise writing rate equations); and,

(b) rate and equilibrium constant including Ka and Kb, pH ↔ [H ], pOH ↔ [OH ], and Kw.
-
+

It is essential that students be given sufficient practice at these calculations.

4. Emphasise the practical applications of redox reactions to show that the equilibria in
electrochemical cells are redox in nature. From here, students may practise writing cell
diagrams to determine, for example:

(a) the direction of electron flow;

(b) the nature of the electrodes;

(c) the reaction that may occur; and,

(d) cell potentials.

5. Engage students in a brief discussion on the importance of Kinetics and Equilibria to industrial
and biological processes.

6. Ask students to conduct research on kidney stone formation and its prevention.

CXC A11/U2/17 27