Water is a solvent and sugar is the solute. When sugar is added to water, a solution is formed as the sugar crystals dissolve. The sugar particles are still there in solution, however, they are evenly mixed. They have not changed into something different. A mixture is when two or more different substances are mixed but not chemically combined. However, a mixture can be separated again by physical means. Evaporation is one easy method to separate the sugar from the water. If one boils this solution, only the water will evaporate out of the mixture at 100 degrees Celsius. The water will change to gas and the solid sugar will remain behind. Eventually, the sugar will recrystallize when the particles cool.