Click here to open a Word document with an explanation of the practical and photographs captured at the start and end of the experiment. Questions which you might ask students are included.

Right click here and open a new window to see timelapsed photographs in a PowerPoint presentation (1MB)

Right click here and open a new window to view high quality video or right click to download (1.5MB)

This video demonstrates the presence of Hydrogen bromide gas produced by the photodissociation of bromine and subsequent reaction with hexane. The presence of the gas is demonstrated by the production of a white precipitate when a glass rod which has been dipped in concentrated ammonia is lowered into the tubes. Tube 1 has been partially exposed to light whilst tube 3 has been fully exposed to light.

For further information see Salters Advanced Chemistry, 2000, Activities and Assessment Pack, Second Edition, ISBN 0 435 631217