The video shows the classic diffusion experiment using ammonia and hydrogen chloride (evaporating from concentrated solutions). One animation is a formative assessment task which links particle diagrams to a diffusion experiment involving a coloured and colourless liquid. Some students find it difficult to believe that the particles in a still volume of liquid are moving – they are happier to say the particles can be moved around. They can be used to develop ideas relating to the intrinsic motion of particles and diffusion phenomena involving the liquid and gas states.ĭue to the intrinsic translational movement of particles, samples of substances in the liquid and gas states will mix without the need for external agitation (stirring of some kind).
These downloadable videos and animations are part of the multimedia package Stuff and Substance, developed by the Gatsby Science Enhancement Programme (SEP).
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