Problem: You wonder if a sugar cube dissolves faster either in a hot or cold water.
Observation: Dissolving the sugar cube
Question: Does the sugar cube dissolve faster in hot water or cold water?
Hypothesis: If a sugar cube is put in hot water, it will dissolve faster than if it is dissolved in cold water.
Experiment:
- Prepare some sugar cubes, a glass of hot water, a glass of cold water and two teaspoons.
- Put a sugar cube in each of the hot water and cold water with the same size sugar cube and stir the sugar in both glasses of water.
- To calculate the speed of dissolution, you can use a timer to determine the time when the sugar cube starts to dissolve in the hot and cold water.
Analysis: Sugar cube dissolved in hot water dissolves faster than in cold water. The solubility of a substance depends on the temperature of the solvent. The dissolution of a substance in a liquid is a melting event due to the breaking of bonds in the molecules of the solid.
Hot water temperature can increase the average kinetic energy of sugar molecules. Kinetic energy increases the sugar molecules and can cause the bonds between the molecules to break so that the sugar can dissolve completely faster in hot water.
Cold water temperature does not increase the kinetic energy of sugar molecules so sugar is more difficult to dissolve in cold water and the undissolved sugar grains are still rough and visible.
Conclusion: Sugar cubes dissolved in hot water dissolve faster than in cold water. The solubility of a substance depends on the temperature of the solvent.
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