A student in Trinidad investigates diffusion by placing a drop of food colouring in water at different temperatures. She observes that the colour spreads faster in hot water. Which explanation best accounts for this observation?

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Question

A student in Trinidad investigates diffusion by placing a drop of food colouring in water at different temperatures. She observes that the colour spreads faster in hot water. Which explanation best accounts for this observation?

Accepted Answer

Particles in hot water have greater kinetic energy and move faster — Award 1 mark for linking higher temperature to greater kinetic energy and faster particle movement. A is incorrect — while spacing may increase slightly, this is not the primary reason. C contradicts the observation. D is partially true but does not explain the faster diffusion rate.

Answer

The food colouring dissolves better in cold water

Answer

Particles in hot water have greater kinetic energy and move faster

Answer

Hot water has larger spaces between particles

Answer

Hot water has fewer particles per unit volume

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