Diffusion and Osmosis

What is osmosis?

• The movement of water molecules through a selectively permeable membrane from a region of lower solute concentration to a region of higher solute concentration.

• The movement of solute molecules from a region of higher concentration to a region of lower concentration.

• The movement of water molecules through a selectively permeable membrane from a region of higher solute concentration to a region of lower solute concentration.

• The movement of solute molecules through a selectively permeable membrane from a region of lower concentration to a region of higher concentration.

What is osmosis?

• The movement of water molecules from a higher water potential to a lower water potential through a partially permeable membrane.

• The movement of solute molecules from a lower concentration to a higher concentration through a permeable membrane.

• The movement of air molecules from a higher pressure to a lower pressure through a permeable membrane.

• The movement of water molecules from a lower water potential to a higher water potential through a partially permeable membrane.

Describe how you would carry out an investigation into osmosis using potato tissue.

• Measure the change in mass of potato slices in different concentrations of sugar solution.

• Observe the color change in potato slices when exposed to light.

• Measure the temperature change of potato slices in water.

• Count the number of bubbles produced by potato slices in vinegar.

What tool is used to cut identical potato cylinders in an osmosis investigation?

• Knife

• Cork borer

• Scissors

• Scalpel

Which solutions are the potato cylinders added to in the osmosis investigation?

• 1M sugar solution, 0.5M sugar solution, and distilled water

• 2M salt solution, 1M salt solution, and tap water

• 1M sugar solution, 1M salt solution, and distilled water

• 0.5M sugar solution, 0.5M salt solution, and tap water

What is done to the potato cylinders after removing them from the tubes in the osmosis investigation?

• They are washed with water

• They are dried with paper towels

• They are heated

• They are frozen

What is plotted on the y-axis of the graph in the osmosis investigation?

• Concentration of solution

• Length of cylinders

• Change in mass in grams

• Time in hours

Why is it necessary to use a cork borer to cut the cylinders?

• To ensure uniform size and shape

• To make the cylinders colorful

• To increase the weight of the cylinders

• To make the cylinders hollow

Why is it necessary to use a cork borer to cut the cylinders?

• It results in equal sized samples so changes in length and mass can be compared easily.

• It makes the samples more colorful.

• It helps in increasing the mass of the samples.

• It ensures the samples are softer.

Why is it necessary to blot the cylinders with paper after removing them?

• To remove excess liquid and ensure accurate measurements.

• To make the cylinders shiny.

• To change the color of the cylinders.

• To cool down the cylinders.