Question

answer the questions on the virtual lab and write them below. 1. which dialysis tubes had little or no change in mass after the 24 - hour period? a. “a”, “c”, “e” b. “c”, “d” c. “a”, “d” 2. why was pure water used as the control group? a. the control group provides a standard for comparison for the experimental group. b. the control group represents a real cell because real cells contain water. c. the control group was not necessary. 3. why didn’t the mass of dialysis tubes “a” and “d” change over the 24 - hour time frame? a. the dialysis tubing material was clogged. b. the concentration both inside and outside the dialysis tubing is the same. c. the pressure of the dialysis tubing membrane stabilizes the flow of water.

Explanation:

1. Without specific data on the dialysis - tube experiment results, we can only assume based on typical osmosis principles. If there is no mass change, it may be due to equal concentrations inside and outside the tube. Option C mentions "A" and "D" having no mass change.
2. In an experiment, a control group like pure water is used to provide a standard for comparison to the experimental group. This helps in determining the effect of the variables being tested.
3. When the concentration both inside and outside the dialysis tubing is the same, there is no net movement of water (osmosis), resulting in no mass change.

Answer:

1. C. "A", "D"
2. A. The control group provides a standard for comparison for the experimental group.
3. B. The concentration both inside and outside the dialysis tubing is the same.