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Science A2

Welcome to the Tunnelworks A2 Chemistry area

Introducing the Thames Tideway Tunnel. Watch the video to find out why we need to clean up the River Thames.

Here you'll find one lesson, complete with an online presentation, student worksheets and detailed lesson plans. The lesson challenges students to solve a realistic engineering problem to help design, build or operate the Thames Tideway Tunnel. 

After that, you can ‘dig deeper’ with follow-up ideas for more able students. 

Finally, a CREST gold project is outlined, if you wish to connect your work to this well regarded science award scheme. 


In this lesson students explore stoichiometry and titrations using a real-world example of testing for dissolved oxygen in water using the Winkler test – a standard test to measure water quality. 

CREST Gold Award 

Research project: students research the science that helps us understand why the number of sewage discharges into the River Thames has increased over time and the effect these have on river wildlife and the environment. They will discover what people think about the River Thames and create a communications activity to explain the science behind the project.

> Download Project