What is diffusion?
Diffusion is the net movement of particles from areas of higher concentration, to areas of lower concentration.
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Why does diffusion happen?
Diffusion happens because particles move about randomly, so over time will spread out, moving from where there are lots of them (higher concentration), to where there are fewer of them (lower concentration).
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What colour is bromine gas?
Brown.
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What colour is potassium manganate(VII)?
Purple.
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Are particles of ammonia or particles of hydrogen chloride smaller?
Particles of ammonia are smaller.
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