Question

student handout

1. which of the following choices describes an investigation in which a student is studying the effect of increasing the surface area of a solute?

a. a student mixes sodium chloride in various volumes of water and calculates the concentration of each solution.
b. a student drops a sugar cube in water and mixes a tablespoon of loose sugar in a second container of water to see which one dissolves more quickly.
c. a student pours a single container of salt water on the lab counter and measures how long it takes to evaporate.
d. a student mixes a teaspoon of copper sulfate into each of two identical beakers of water and stirs them at different speeds to see which one dissolves more quickly.

1. describe an investigation that could help a student model how temperature affects the rate of dissolution in a solid. describe the results that you would expect.

Explanation:

Step1: Analyze Option A

This option is about varying the volume of water and calculating concentration, not surface area of solute.

Step2: Analyze Option B

A sugar cube has a smaller surface area compared to loose sugar (same amount of sugar but more surface area for loose sugar). By comparing their dissolution rates, the effect of surface area is studied.

Step3: Analyze Option C

This is about evaporation of salt - water, not related to surface area of solute affecting dissolution.

Step4: Analyze Option D

This is about the effect of stirring (agitation) on dissolution rate, not surface area.

Answer:

B. A student drops a sugar cube in water and mixes a tablespoon of loose sugar in a second container of water to see which one dissolves more quickly.