Why does sugar melt in water?

Sugar is made of molecules of sucrose, a compound held together by relatively weak bonds. When the sucrose molecules mix with water, the water molecules surround and break the bonds holding together the sugar molecule. Th sugar is still in the water, of course (which is why the water tastes sweet), but now it’s dissolved into the new sugar-and-water mix, called a “solution.” Hot water dissolves sugar more quickly – and can hold more of it – because the heat spreads its molecules farther apart, making room for more sucrose.


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