Instant cocoa dissolves more quickly in a cup of hot water than in a cup of cold water.
  No matter what you do, you cannot make sand dissolve in water. The ability of one substance to dissolve in another is called its solubility. Solubility is a measure of the amount of a substance that will dissolve in another substance. Since sand does not dissolve in water, the solubility of sand in water is zero. 
  Sometimes you can speed up the process of dissolving the solute by raising the temperature of the solvent. This is true for most solutes that are solids. For example, you can dissolve more sugar in warm water than you can in cold water. 
  Another way to make a solute dissolve more quickly is to crush it. If you drop a sugar cube into a cup of water it will dissolve, but it may take a while. If you crush the sugar cube into tiny crystals, the crystals will dissolve very quickly. The reason for this is that more of the sugar particles are touching the water when the sugar is in tiny crystals than when it is in a sugar cube. 
What are the parts of a solution?
What factors affect the solubility of a
 During the Gold Rush, many people panned for gold. Panning separates gold from a mixture of gold and other particles such as sand. Use books or the Internet to find out about the California Gold Rush. 
   Sand does not
   dissolve in water.
  The salt is
dissolved in
this solution.
Salt dissolves
in water.