First, you need to explain to the child why the sugar seemed to disappear when you stir it into a glass of clear lemon-flavored drink. When you stir a spoonful of sugar into the glass, you are forming
a solution. This type of liquid solution is composed of a solid solute,
which is the sugar, and a liquid solvent, which is clear lemon-flavored drink. As the
sugar molecules spread evenly throughout the water, the sugar dissolves.
In order for the sugar to get back again, you need to evaporate the clear lemon-flavored drink, over a low heat and wait until a white residue appears. That residue is the sugar.
