Question

which factor increases the rate of dissolution in an unsaturated solution?
○ increasing the temperature
○ decreasing the surface area
○ decreasing the amount of solute
○ increasing the amount of solvent

Explanation:

• For "increasing the temperature": Increasing temperature generally provides more kinetic energy to particles, making solvent molecules interact more with solute particles, thus increasing dissolution rate.
• For "decreasing the surface area": A smaller surface area means less contact between solute and solvent, which decreases dissolution rate.
• For "decreasing the amount of solute": This affects the amount dissolved, not the rate of dissolution (rate is about how fast, not how much).
• For "increasing the amount of solvent": This dilutes the solution but doesn't directly increase the rate of dissolution (rate relates to how fast solute dissolves, not solvent volume affecting speed of dissolving). So the correct factor is increasing the temperature.

Answer:

A. increasing the temperature