Which molecule(s) will move across the membrane and in which net direction(s)? Notice that the levels of liquid in both A and B are equal. Do you think they will appear this way when the system reaches equilibrium? Explain. Three funnels containing three different starch solutions were placed for 24 hours into a beaker that contained a starch solution of UNKNOWN concentration. The end of each funnel was covered by a selectively permeable membrane allowing only water to pass across the membrane. Based on the results, what is the concentration of the unknown solution? How can you tell? Flasks X, Y, and Z contain solutions with different concentrations of the solute NaCl. Flask X has 0.5% NaCl, flask Y has 0.9% NaCl, and flask Z has 1.5% NaCl. Red blood cells (0.9% NaCl) will be placed into each flask. Predict what will happen when water crosses the red blood cell membrane. Predict what will happen to the red blood cells in flask X (draw a diagram). Predict what will happen to the red blood cells in flask Y (draw a diagram). Predict what will happen to the red blood cells in flask Z (draw a diagram). Study the diagrams of the beakers to the right, noting the concentrations of various substances in the beakers and in the cellulose bags. Water molecules can pass through the cellulose, but starch cannot pass through. Draw arrows in the diagrams to show the direction in which water will move.
Which molecule(s) will move across the membrane and in which net direction(s)? Notice that the levels of liquid in both A and B are equal. Do you think they will appear this way when the system reaches equilibrium? Explain. Three funnels containing three different starch solutions were placed for 24 hours into a beaker that contained a starch solution of UNKNOWN concentration. The end of each funnel was covered by a selectively permeable membrane allowing only water to pass across the membrane. Based on the results, what is the concentration of the unknown solution? How can you tell? Flasks X, Y, and Z contain solutions with different concentrations of the solute NaCl. Flask X has 0.5% NaCl, flask Y has 0.9% NaCl, and flask Z has 1.5% NaCl. Red blood cells (0.9% NaCl) will be placed into each flask. Predict what will happen when water crosses the red blood cell membrane. Predict what will happen to the red blood cells in flask X (draw a diagram). Predict what will happen to the red blood cells in flask Y (draw a diagram). Predict what will happen to the red blood cells in flask Z (draw a diagram). Study the diagrams of the beakers to the right, noting the concentrations of various substances in the beakers and in the cellulose bags. Water molecules can pass through the cellulose, but starch cannot pass through. Draw arrows in the diagrams to show the direction in which water will move.
7.3%20Cell%20Transport%20HW%20packet.docx