Question

the series shows a water solution containing dye molecules. over time, the dye molecules move across a membrane. which will change most from time 1 to time 3?
a. the volume of the solution
b. the shape of dye molecules
c. the temperature of the water
d. the concentration of dye molecules

Explanation:

The diagram shows the movement of dye molecules across a membrane. This is a process of diffusion. Diffusion is the movement of molecules from an area of higher concentration to an area of lower concentration. As time passes (from Time 1 to Time 3), the dye molecules spread out. The key factor that changes the most is the concentration of dye molecules. Initially, there is a higher concentration of dye molecules on one side of the membrane. Over time, due to diffusion, the concentration of dye molecules becomes more evenly distributed (reaches equilibrium). The volume of the solution (Option A) is not indicated to change. The shape of dye molecules (Option B) remains the same as they are just moving, not changing form. The temperature of the water (Option C) is not shown or mentioned in the diagram as a variable that changes.

Answer:

D. the concentration of dye molecules