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This demonstration shows how a mixture of hydrogen and air becomes explosive.

The initial pop is probably caused by a small portion of the hydrogen leaking out, mixing with the air immediately above the hole and forming a minute combustible mixture.

As more hydrogen escapes through the top hole, it...

Gas Explosion

This demonstration illustrates the explosive nature of gas/air mixtures. The gas used in laboratory Bunsen burners (methane) normally burns with a blue or yellow flame. However, mixtures with air explode when the concentration of the methane is between 5 and 15%.

Howling Jelly Baby

In this demonstration, the carbohydrate in the jelly baby is oxidised by the molten potassium chlorate(V). The jelly baby ignites and burns furiously with a high pitched roar, showing that food stuffs provide energy.

The Non-burning £5 Note

In this demonstration, a piece of paper is soaked in ethanol and water, the ethanol burns but the water prevents the paper burning. To make this demonstration very exciting, a £5 note can be used.

Zinc Christmas Tree

In this demonstration of a displacement reaction, a piece of foil in the shape of a Christmas tree is placed in lead nitrate solution. Within a few minutes the tree becomes covered with sparkling crystals of lead.


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