Question

osmosis across a cell membrane can be modeled using a u - shaped tube. this diagram of a u - shaped tube shows two solutions immediately after they were poured into the tube. the solutions were made by dissolving different amounts of the same solute in water. according to the diagram, which statements describe the solutions immediately after they were poured into the u - shaped tube? select all that apply. the two solutions have the same concentration. the two solutions have the same volume. water is the solvent in both solutions. the two solutions are at equilibrium.

Explanation:

1. Concentration Check: The diagram shows different numbers of solute particles (orange dots) in the two arms of the U - tube. Since concentration is the amount of solute per unit volume of solvent, different numbers of solute particles mean different concentrations. So "The two solutions have the same concentration" is incorrect.
2. Volume Check: By looking at the liquid levels (and the scale markings) in the U - shaped tube, the volume of the two solutions appears to be the same. So "The two solutions have the same volume" is correct.
3. Solvent Check: Both solutions are made by dissolving solute in water, so water is the solvent in both. Thus, "Water is the solvent in both solutions" is correct.
4. Equilibrium Check: Equilibrium in osmosis occurs when the net movement of water stops. Immediately after pouring, water will start moving across the semipermeable membrane (due to concentration differences), so the solutions are not at equilibrium. Thus, "The two solutions are at equilibrium" is incorrect.

Answer:

The correct statements are:

• The two solutions have the same volume.
• Water is the solvent in both solutions.