Particle Disco

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

The demonstrator shows that water molecules move faster when heated. Using two glass of water, one hot and one cold, and putting in a few drops of food colouring, the two glasses are observed and the faster moving water molecules in the hot water mix the colour more quickly than the cold water.

This idea could then link to an investigation on looking at dissolving sugar or salt in water at different temperatures.

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