Lava Lamp

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This video from the Royal Society of Chemistry (RSC), aimed at primary teachers, demonstrates an experiment which may be used when learning about liquids, gases and irreversible reactions.

Coloured water and oil are poured into a container and they separate according to their densities. The oil on top when an effervescent tablet is added reacts with the water to produce carbon dioxide gas which pushes out through the oil, creating a lava lamp effect.

This demonstration could be carried out in class with children offering explanations of what they observe.

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