1. 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. the sugar has more space to dissolve into the spaces between the molecules in hot water than cold. The added energy in the hot water causes water molecules to move faster and sucrose molecules to vibrate faster. So the reason why sugar dissolves at a faster rate in hot water has to do with increased molecular motion. Anonymous answered . ... both in the solid and the water. > The reason why sugar dissolves at a faster rate in hot water has to dowith increased molecular motion. When water is heated, the molecules gain energy and, thus, move faster. Sugar dissolves faster in hot water than it does in cold water because hot water has more energy than cold water. The reason granulated sugar dissolves faster than a sugar cube has to do with surface area. ... A solvent is a substance that can dissolve other substances – water is a good solvent. With bigger gaps between the molecules in the hot water, more sugar molecules can fit in between. This added movement tends to make the bonds between sucrose molecules easier to overcome. You can stir in more sugar in the water if it is hotter. 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. i think its because the hot water molecules are moving faster- farther apart- than cold water -slow moving - molecules. 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. As they move faster, they come into contact with the sugar more often, causing it to dissolve faster. If you dissolve the maximum amount of sugar in hot water, some of the sugar will come out of solution when the water cools off. A sugar cube is tightly compacted granulated sugar, meaning it … The reason why sugar dissolves at a faster rate in hot water has to do with increased molecular motion. Sugar dissolves faster in something hot than it does in something cold is because when particles are heated, they move faster. 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 added energy in the hot watercauses water molecules to move faster and sucrose molecules to vibrate faster. Why is hot water a better solvent than cold water? The added energy in the hot water causes water molecules to move faster and sucrose molecules to vibrate faster. Dissolving a solid requires energy input to disrupt the forces holding the molecules together, both in the solid and the water. 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