Topic One (1.1): Techniques to Measure the Rate of a Reaction

Introduction Icon.png Introduction

This section concentrates on techniques to measure changes in concentration of either the reactant or product(s) of a reaction. You should be familiar with measuring evolution of gases with a gas syringe or change of mass using a balance. If either the reactant or product(s) are coloured colorimetry is useful. Remember to clearly state the colour change.

Read Icon.png Reading

Edexcel AS/A Level Chemistry Student Book 2 pages 3 to 6

Make Notes Icon.png Tasks

Complete the following:

  • Read pages 4 to 6 and take notes including clear diagrams. You might be expected to draw these in examinations.
  • Complete the ‘checkpoint’ questions.

WATCH - Using Colorimeters (YouTube) Links to an external site.

Top Tip Icon.png Top Tips

Make sure that you understand the following key points:

  • Remember practical errors can occur when evolution of gas causes a spray. Take steps to prevent this.
  • Some gases are slightly soluble (carbon dioxide) or very soluble (sulphur dioxide) in water so collection over water will lead to errors.

Glossary Icon.png Key Terms

Add the following key terms with definitions to your glossary.

  • Rate of reaction
  • Species