A sugar cube is tightly compacted granulated sugar, meaning it … ... A solvent is a substance that can dissolve other substances – water is a good solvent. The reason why sugar dissolves at a faster rate in hot water has to do with increased molecular motion. You can stir in more sugar in the water if it is hotter. When the sugar crystals are dissolving at exactly the same rate that sugar is crystallizing out of solution, a system is at equilibrium. ... both in the solid and the water. The weak bonds that form between the solute and the solvent compensate for the energy needed to disrupt the structure of both the pure solute and the solvent. The reason why sugar dissolves at a faster rate in hot water has to do with increased molecular motion. Sugar dissolves in water because energy is given off when the slightly polar sucrose molecules form intermolecular bonds with the polar water molecules. Why does sugar dissolve faster in hot water than in cold water 2 See answers littlerose littlerose Hot water has higher capability for dissolving sugar. The balance between dissolution and crystallization can be changed by changing the temperature of the solution. With bigger gaps between the molecules in the hot water, more sugar molecules can fit in between. Sugar dissolves faster in something hot than it does in something cold is because when particles are heated, they move faster. When water is heated, the molecules gain energy and, thus, move faster. So the reason why sugar dissolves at a faster rate in hot water has to do with increased molecular motion. As they move faster, they come into contact with the sugar more often, causing it to dissolve faster. The added energy in the hot water causes water molecules to move faster and sucrose molecules to vibrate faster. Sugar dissolves faster in hot water than it does in cold water because hot water has more energy than cold water. Why Does Sugar Dissolve Faster In Hot Water Than In Cold Water? Another name for the liquids inside the cups is a 'solution', when this solution can no longer dissolve sugar it becomes a 'saturated solution', this means that sugar starts forming on the bottom of the cup. The solubility of sugar in water is higher for hot water than for cold water. 3 Answers. Anonymous answered . Why is hot water a better solvent than cold water? > The reason why sugar dissolves at a faster rate in hot water has to dowith increased molecular motion. The cold water isn't able to dissolve as much sugar as the hot water, but why? The reason granulated sugar dissolves faster than a sugar cube has to do with surface area. This added movement tends to make the bonds between sucrose molecules easier to overcome. The water molecules are more agitated and there is more motion inside the liquid and hence the sugar molecules get spread out far more quickly than in cold water. 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