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Elements, Compounds and Mixtures
Diffusion.
When two gases or liquids mix
together, the fast randomly moving
particles collide, and this
slows down the rate of mixing.
Diffusion is the random movement of
one liquid or gas through another
from a region of high concentration to a
region of low concentration.
Potassium Manganate
(VII) is dark
purple.
When the solid is dissolved in water,
the purple particles slowly diffuse out into the clear
liquid.
Eventually, the random motion of all
the particles
results in the purple colour being equally
dispersed throughout the water.
Note that the particles are moving
fast
but the many collisions with each
other slow their progress,
and so diffusion appears to be slow.
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