The Osmosis Experiment: Theory, Procedure, and Results

The video tutorial covers an osmosis experiment involving potato cells. It begins with an explanation of osmosis, using a diagram to illustrate the movement of water molecules through a partially permeable membrane. The experiment setup is detailed, including the equipment and materials needed. Catherine conducts the experiment by preparing potato cylinders, measuring their initial mass and length, and immersing them in sugar solutions of varying concentrations. After an hour, the changes in the potatoes' mass and length are recorded, highlighting the effects of osmosis. The tutorial concludes with a summary of the steps and results.

What is the primary process by which water molecules move through a partially permeable membrane?

• Evaporation

• Diffusion

• Osmosis

• Filtration

In the osmosis experiment, what is the role of the dashed line in the diagram?

• It symbolizes the partially permeable membrane.

• It indicates the direction of water flow.

• It represents the solute molecules.

• It shows the concentration gradient.

Which piece of equipment is used to measure the mass of potato pieces in the experiment?

• Ruler

• Balance

• Glass rod

• Scalpel

What is the concentration range of the sugar solutions used in the experiment?

• 1 to 2 molar

• 0.5 to 1 molar

• 0 to 1 molar

• 0 to 0.5 molar

What tool does Catherine use to create cylinders of potato?

• Cork borer

• Balance

• Scalpel

• Glass rod

How long are the potato cylinders cut to ensure uniformity?

• 6 cm

• 4 cm

• 3 cm

• 5 cm

What change is observed in the potato piece placed in the 0.25 molar solution?

• Increase in length, decrease in mass

• No change in length, decrease in mass

• Increase in length and mass

• Decrease in length and mass

Which solution caused the greatest decrease in both length and mass of the potato?

• 0 molar

• 0.25 molar

• 0.75 molar

• 1 molar

What is the final step in the osmosis experiment as outlined in the presentation?

• Place cylinders in sugar solutions

• Measure the initial mass and length

• Remove cylinders, dry them, and measure new mass and length

• Prepare sugar solutions

What was a noted difficulty in measuring the length of the potato pieces after osmosis?

• The solutions were too concentrated

• The potatoes were too small

• The potatoes changed shape

• The ruler was inaccurate