Q: If the initial mass of a dialysis bag is 5.0 g and the final mass after 24 hours is 6.2 g, what is the percent change in mass?

$$\frac{6.2 - 5.0}{5.0} \times 100 = 24\%$$

Question 1

Which process is being modeled by the use of dialysis tubing in the experiment described in the study materials?

Accepted Answer

Osmosis

Question 2

If a dialysis bag filled with a 10% sucrose solution is placed in pure water, what is the expected net movement of water after 24 hours?

Accepted Answer

Water will move into the bag, causing it to gain mass.

Question 3

Which equation correctly calculates the change in mass of a dialysis bag over the course of the experiment?

Accepted Answer

$$\Delta m = m_{final} - m_{initial}$$

Question 4

Why is pure water used as the control group in the dialysis tubing experiment?

Accepted Answer

It provides a baseline to compare the effects of solute concentration on osmosis.

Question 5

A dialysis bag containing 20% glucose solution is placed in a beaker with 5% glucose solution. After 24 hours, the bag gains mass. What does this indicate about the direction of water movement?

Accepted Answer

Water moved from the beaker into the bag.

Question 6

Which statement best describes how a cell responds to its external environment, as modeled by the dialysis tubing experiment?

Accepted Answer

A cell loses or gains water depending on the concentration gradient across its membrane.

Question 7

If the initial mass of a dialysis bag is 5.0 g and the final mass after 24 hours is 6.2 g, what is the percent change in mass?

Accepted Answer

$$\frac{6.2 - 5.0}{5.0} 	imes 100 = 24\%$$

Question 8

Which of the following best explains why the mass of some dialysis tubes did not change significantly after 24 hours?

Accepted Answer

The concentration of solute inside and outside the bag was equal, resulting in no net movement of water.

Question 9

In the experiment, if a dialysis bag loses mass after being placed in a beaker, what can be inferred about the relative solute concentrations?

Accepted Answer

The solute concentration outside the bag is higher than inside.

Question 10

Which real-world medical scenario is most similar to the dialysis tubing experiment described?

Accepted Answer

Dialysis treatment for kidney failure

Question 11

If a cell is placed in a hypertonic solution, what will happen to its mass over time?

Accepted Answer

It will lose mass as water leaves the cell.

Question 12

Which of the following is the best definition of homeostasis as it relates to the experiment?

Accepted Answer

The ability of a cell to maintain a constant internal environment despite changes in external conditions.

Question 13

A dialysis bag containing 0.9% NaCl is placed in a beaker with 0.9% NaCl. What is the expected change in mass after 24 hours?

Accepted Answer

The bag's mass will remain approximately the same.

Question 14

Which variable should be kept constant to ensure valid results in the dialysis tubing experiment?

Accepted Answer

Temperature of the water

Question 15

If the final mass of Bag C is less than its initial mass, which of the following is the most likely explanation?

Accepted Answer

Water moved out of the bag due to a higher solute concentration in the beaker.

Question 16

Which of the following best describes the role of the dialysis tubing in the experiment?

Accepted Answer

It acts as a selectively permeable membrane, allowing water but not large solutes to pass through.

Question 17

If a dialysis bag is placed in a solution and its mass does not change, what can be concluded about the tonicity of the solution relative to the bag?

Accepted Answer

The solution is isotonic to the bag.

Question 18

Which of the following is a correct step in the scientific method as applied in the dialysis tubing experiment?

Accepted Answer

Creating control and experimental groups to test the hypothesis.

Question 19

If the initial mass of Bag D is 4.5 g and the final mass is 4.2 g, what is the change in mass, and what does this indicate about the environment?

Accepted Answer

$$\Delta m = 4.2 - 4.5 = -0.3 g$$; the environment is hypertonic to the bag.

Question 20

Which of the following best explains why dialysis tubing is used to model cell membranes in laboratory experiments?

Accepted Answer

It mimics the selective permeability of biological membranes.

Osmosis and Homeostasis: Dialysis Tubing Lab Study Notes

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