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Checking Water Transfer Across a Model Membrane 4 questions
Checking Water Transfer Across a Model Membrane
Base your answers on the information provided and your knowledge of chemistry. Use the 2025 Chemistry Reference Tables as needed.
A model membrane passes water but holds dissolved solute particles on their original side. Both sides initially have the same volume. At equal pressure, the model predicts net water transfer toward the side with more dissolved particles per unit volume. Each sugar molecule counts as one particle. Each dissolved salt unit separates into two particles.
| Test | Left side | Right side |
|---|---|---|
| P | Eight sugar molecules | Four salt units |
| Q | Eight sugar molecules | Six salt units |
Question 1
Which test begins with equal dissolved particle counts on the two sides?
- P only
- Q only
- Both tests
- Neither test
Question 2
Predict the initial net movement of water in Q. Use both particle counts.
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Question 3
A student says water moves toward the sugar side in Q because eight is greater than six. Explain what the comparison counts incorrectly.
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The display can replace the right side of Q with a salt solution in twice the original volume. The left side keeps its original volume and eight dissolved sugar particles.
Question 4
Find how many salt units the larger right side needs to match the starting dissolved particle concentration of the left side.
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