Drop a crystal of copper sulphate or
potassium permanganate into a glass
of hot water and another containing
cold water. Do not stir the solution.
Allow the crystals to settle at the
bottom.
What do you observe just above the
solid crystal in the glass?
What happens as time passes?
What does this suggest about the
particles of solid and liquid?
Does the rate of mixing change with
temperature? Why and how?
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