Which of the following would NOT increase the rate at which a sugar cube dissolves in water?

• A. Using hot water instead of cold water
• B. Decreasing the temperature of the water
• C. Stirring the solution
• D. Crushing the sugar cube into smaller pieces

Answer: (B)

Verified step by step guidance

1. Understand that the rate at which a sugar cube dissolves in water depends on factors that increase the interaction between sugar and water molecules.
2. Recognize that increasing temperature generally increases the rate of dissolution because molecules move faster, enhancing solubility and interaction.
3. Know that stirring the solution helps distribute sugar molecules throughout the water, increasing the rate of dissolution by reducing the concentration gradient near the sugar surface.
4. Realize that crushing the sugar cube into smaller pieces increases the surface area exposed to water, which speeds up the dissolving process.
5. Identify that decreasing the temperature of the water would NOT increase the rate of dissolution because lower temperatures reduce molecular motion and solubility, thus slowing down the process.