Name
Ms. Swahn
Science - Period
Date
Osmosis and Diffusion
Part I. In the diagram below, the dotted line in each box represents a semi-permeable membrane. The circles represent water molecules, and the triangles represent glucose molecules. The membrane is permeable to water but not to glucose. Therefore water molecules can move through the membrane, but glucose molecules cannot. The concentrations of water and glucose molecules on each side of the membrane are shown in each box. Draw an arrow across each membrane to show the overall direction of osmosis.
What if the membrane above was permeable to the glucose and not water?
Which molecules would move?
Which way would the arrows point? (draw them in a different color)
This would be the process of
Part II. Osmosis can cause living cells to shrink or to swell. The cell in each box below is immersed in a salt solution. Note the concentration of salt molecules inside and outside each cell. Note also the concentration of water molecules inside and outside each cell. Draw an arrow showing the overall direction of osmosis. Decide whether the cell will shrink, swell, or stay the same. Write your answers on the line below each cell.
A B C
KEY
Osmosis and Diffusion
Part I. In the diagram below, the dotted line in each box represents a semi-permeable membrane. The circles represent water molecules, and the triangles represent glucose molecules. The membrane is permeable to water but not to glucose. Therefore water molecules can move through the membrane, but glucose molecules cannot. The concentrations of water and glucose molecules on each side of the membrane are shown in each box. Draw an arrow across each membrane to show the overall direction of osmosis.
What if the membrane above was permeable to the glucose and not water?
Which molecules would move? Glucose
Which way would the arrows point? Opposite direction (draw them in a different color in red above)
This would be the process of diffusion
Part II. Osmosis can cause living cells to shrink or to swell. The cell in each box below is immersed in a salt solution. Note the concentration of salt molecules inside and outside each cell. Note also the concentration of water molecules inside and outside each cell. Draw an arrow showing the overall direction of osmosis. Decide whether the cell will shrink, swell, or stay the same. Write your answers on the line below each cell.
A SWELL B Stay the SAME C SHRINK
4.1 Osmosis Worksheet 1/11