1. The driving force for diffusion is :
b. the kinetic energy of the molecules in motion.
2. In diffusion, molecules move :
a. from high concentration to low concentration.
3. Which of the following dialysis membranes has the largest pore size?
d. 200 MWCO
4. Avogadro's number is a constant for the number of :
b. molecules.
Experiment Results Predict Question:
The molecular weight of urea is 60.07. Do you think urea will diffuse through the 20 MWCO membrane?
c. No, not at all.
Recall that glucose is a monosaccharide, albumin is a protein with 607 amino acids, and the average molecular weight of a single amino acid is 135 g/mole. Which of the following will be able to diffuse through the 200 MWCO membrane?:
c. glucose only
The reason sodium chloride didn't diffuse left to right is that You correctly answered:
c. the membrane pore size was too small.
Glucose is a six-carbon sugar. Albumin is a protein with 607 amino acids. The average molecular weight of a single amino acid is 135 g/mole. There is no reason to run these solutes at the 20 MWCO because :
d. glucose and albumin are both too large to pass.
The rate of diffusion for urea:
b. is slower than that for sodium because urea is a larger molecule.
Post-lab Quiz Results:
1. The effect of increasing the concentration of sodium chloride from 9 mM to 18 mM in the left beaker was to b. increase the rate of diffusion.
2. Describe the difference between the rate of diffusion seen for sodium and urea.
c. Urea diffused more slowly because it is larger than sodium.
3. Which of the following solutes did not pass through any of the membranes?
b. albumin
4. When diffusion stops, we say the solution has reached:
a. equilibrium.
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