6.1.1

Define the term rate of reaction.

1

6.1.2

Describe suitable experimental procedures for measuring rates of reactions.

2

Aim 7: Data loggers can be used to collect data and produce graphs.

TOK: The empirical nature of the topic should be emphasized. Experimental results can support the theory but cannot prove it.

6.1.3

Analyse data from rate experiments.

3

Students should be familiar with graphs of changes in concentration, volume and mass against time.

6.2.1

Describe the kinetic theory in terms of the movement of particles whose average energy is proportional to temperature in kelvins.

2

6.2.2

Define the term activation energy, Ea.

1

6.2.3

Describe the collision theory.

2

Students should know that reaction rate depends on:

• collision frequency

• number of particles with E ≥ Ea

• appropriate collision geometry or orientation.

6.2.4

Predict and explain, using the collision theory, the qualitative effects of particle size, temperature, concentration and pressure on the rate of a reaction.

3

Aim 7: Interactive simulations can be used to demonstrate this.

6.2.5

Sketch and explain qualitatively the Maxwell–Boltzmann energy distribution curve for a fixed amount of gas at different temperatures and its consequences for changes in reaction rate.

3

Students should be able to explain why the area under the curve is constant and does not change with temperature.

Aim 7: Interactive simulations can be used to demonstrate this.

6.2.6

Describe the effect of a catalyst on a chemical reaction.

2

6.2.7

Sketch and explain Maxwell–Boltzmann curves for reactions with and without catalysts.

3