Class, here are some pictures and videos on Solutions and Solubility. Watch them and compare with your class notes. Hope it helps.
A hot solvent can usually hold more solute than a cool solvent can (temperature increase).
But if a hot saturated solution is cooled slowly, sometimes the excess solute remains dissolved for a period of time (it doesn't settle yet).
Such a solution is said to be supersaturated, because it contains more than the normal amount of solute that can be dissolved at a lower temperature (it went over its limit).
The following are Summary Notes for this topic. Feel free to look at it and print it if you want:
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