What is diffusion?

• The process by which molecules or particles spread out from an area of high concentration to an area of low concentration.

• The process by which molecules or particles are absorbed by a solid or liquid substance.

• The process by which molecules or particles spread out from an area of low concentration to an area of high concentration.

• The process by which molecules or particles move in a random pattern without any specific direction.

Tags

NGSS.HS-PS1-5

During osmosis

• water moves from high water potential to low water potential

• large or oddly shaped molecules move across a cell membrane
• energy is used to move water across the membrane

• water moves from low water potential to high water potential

In osmosis, which direction does water move?

• Water moves in both directions in osmosis.

• From an area of lower solute concentration to an area of higher solute concentration.

• Water does not move in osmosis.

• From an area of higher solute concentration to an area of lower solute concentration.

In the lab, which solutions caused the potato cores to gain mass?

• the ones with the lower sucrose solutions

• the ones with the higher sucrose solutions

• the ones with solute solutions equal to the potato cells

Tags

NGSS.MS-LS2-1

Where will the water go?

• Into the cell
• Out of the cell
• Equally in & out - it's isotonic
• There is no water

Tags

NGSS.HS-LS1-3

Pure water has a water potential of ___.

• 1
• 0
• -1
• 100

What happens to a solution's water potential as you add more solute?

• it becomes higher

• it stays the same

• it becomes lower (more negative)

You are stranded at sea with Mr. Fonde, and in a moment of desperation, he leans over the boat to drink the ocean water. You yell out to him to stop and he asks you "Why can't I drink this?" How should you answer?

• "It's hypertonic to your cells and your cells will dehydrate"

• "It's hypotonic to your cells and your cells will burst"

• "It's isotonic to your cells and your cells will be shrink"

• "It's paratonic to your cells will grow"

Tags

NGSS.HS-LS1-3

Look at this group's data and determine the molarity of the solution where their cells were at equilibrium.

• 0.75 M

• 0.8 M

• 0.0 M

• 0.65 M

Gregg is conducting an investigation to study how molecules are transported into and out of a cell. Gregg builds a model of a cell using a U-shaped tube. A barrier, which is permeable to water, but not sugar, is placed on the bottom of the tube to model the cell membrane. Gregg adds two different solutions to each side of the tube. The solute in each solution is sugar and the solvent is water. The initial levels of solution in Side A and Side B are equal. The concentration of sugar in Side A is lower than the concentration of sugar in Side B. What should Gregg expect to happen?

• Water molecules will move from Side A to Side B. The solution level on Side A will fall and the solution level on Side B will rise.

• Water molecules will move from Side B to Side A. The solution level on Side A will rise and the solution level on Side B will fall.

• Sugar molecules will move from Side A to Side B. The solution level on Side A will fall and the solution level on Side B will rise.

• Sugar molecules will move from Side B to Side A. The solution level on Side A will rise and the solution level on Side B will fall.

Tags

NGSS.HS-LS2-3