The reason why sugar dissolves at a faster rate in hot water has to do with increased molecular motion. the sugar has more space to dissolve into the spaces between the molecules in hot water than cold. Why Does Sugar Dissolve Faster In Hot Water Than In Cold Water? ... both in the solid and the water. Sugar dissolves faster in hot water than it does in cold water because hot water has more energy than cold water. The solubility of sugar in water is higher for hot water than for 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 added energy in the hot watercauses water molecules to move faster and sucrose molecules to vibrate faster. > The reason why sugar dissolves at a faster rate in hot water has to dowith increased molecular motion. 3 Answers. i think its because the hot water molecules are moving faster- farther apart- than cold water -slow moving - molecules. The added energy in the hot water causes water molecules to move faster and sucrose molecules to vibrate faster. This added movement tends to make the bonds between sucrose molecules easier to overcome. The added energy in the hot water causeswater molecules to move faster and sucrose molecules to vibrate faster. ... A solvent is a substance that can dissolve other substances – water is a good solvent. 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 cold water isn't able to dissolve as much sugar as the hot water, but why? You can stir in more sugar in the water if it is hotter. 1. Dissolving a solid requires energy input to disrupt the forces holding the molecules together, both in the solid and the water. With bigger gaps between the molecules in the hot water, more sugar molecules can fit in between. 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. A sugar cube is tightly compacted granulated sugar, meaning it … The balance between dissolution and crystallization can be changed by changing the temperature of the solution. 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. Why is hot water a better solvent than cold water? Sugar dissolves faster in something hot than it does in something cold is because when particles are heated, they move faster. The reason why sugar dissolves at a faster rate in hot water has to do with increased molecular motion. When the sugar crystals are dissolving at exactly the same rate that sugar is crystallizing out of solution, a system is at equilibrium. 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. The added energy in the hot water causes water molecules to move faster and sucrose molecules to vibrate faster. The reason granulated sugar dissolves faster than a sugar cube has to do with surface area. When water is heated, the molecules gain energy and, thus, move faster. Sugar dissolves in water because energy is given off when the slightly polar sucrose molecules form intermolecular bonds with the polar water molecules. 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