Question

2 what is the effect of agitating a solution of protein powder and drinking water? a stirring decreases the density of the protein powder, making it float b agitation decreases the surface area of the solute. c agitation helps decrease the concentration of the solution. d stirring the solution helps increase the rate of dissolution

Explanation:

• Option A: Density of a substance is a characteristic property and is not changed by stirring. So, this option is incorrect.
• Option B: Agitation does not decrease the surface area of the solute. In fact, if anything, breaking up clumps (which can be part of agitation) might expose more surface area. So, this option is incorrect.
• Option C: Agitation does not change the concentration of the solution. Concentration is \( \frac{\text{amount of solute}}{\text{volume of solution}} \), and agitation does not add or remove solute or change the volume of the solution in a way that affects concentration. So, this option is incorrect.
• Option D: Stirring (agitation) helps to increase the rate of dissolution. It does this by helping to remove the layer of saturated solution around the solute particles, allowing fresh solvent to come into contact with the solute.

Answer:

D. Stirring the solution helps increase the rate of dissolution.