AS and A2 Chemistry notes and resources (WJEC specification) - UNIT CH5 Physical and inorganic chemistry

This unit develops ideas of redox, kinetics, energy changes and equilibria. The inorganic chemistry of some elements in various sections of the Periodic Table is studied.

TOPIC 18 - Chemical kinetics

Candidates should be able to:

(a) describe in outline the variety of methods for studying reaction kinetics e.g. the iodine clock reaction, colorimetry and other spectroscopic techniques, pressure and volume changes;

(b) calculate rates from numerical or graphical data (including drawing tangents to concentration-time curves);

(c) recall and apply the general rate equation, rate = k[A]m [B]n, define rate, rate constant and reaction order, and give the units of rate constants up to, and including, second order;


(e) distinguish clearly between rate and equilibrium and between the effects of temperature change on rates and on the position of equilibrium;

(f) explain and use the concept of rate determining step;

(g) deduce the kinetics that would apply to a suggested mechanism or, conversely, suggest a mechanism consistent with a determined or given reaction order in simple cases and show an understanding of how kinetic evidence may support a proposed mechanism.