While studying diffusion through multiple phases, factors that affect the rate of change of contaminant are: Porosity of the solid phase as the contaminant transports with the fluid through the pores Diffusivity of the contaminant in the fluid phase Tortuosity Temperature of vaporization of the compound being studied

1. Describe two variables that affect the rate of diffusion. __________________________________________________________________________________________________ __________________________________________________________________________________________________ 2. Why do you think the urea was not able to diffuse through the 20 MWCO membrane? How well did the results compare with your prediction? __________________________________________________________________________________________________ 3. Describe the results of the attempts to diffuse glucose and albumin through the 200 MWCO membrane. How well did the results compare with your prediction? __________________________________________________________________________________________________ __________________________________________________________________________________________________ 4. Put the following in order from smallest to largest molecular weight: glucose, sodium chloride, albumin, and urea. __________________________________________________________________________________________________ __________________________________________________________________________________________________ Simulated Facilitated Diffusion 1. Explain one way in which facilitated diffusion is the same as simple diffusion and one way in which it differs. __________________________________________________________________________________________________ __________________________________________________________________________________________________ 2. The larger value obtained when more glucose carriers were present corresponds to an increase in the rate of glucose transport. Explain why the rate increased. How well did the results compare with your prediction? __________________________________________________________________________________________________ __________________________________________________________________________________________________ 3. Explain your prediction for the effect Na+Cl- might have on glucose transport. In other words, explain why you picked the choice that you did. How well did the results compare with your prediction? __________________________________________________________________________________________________ Simulating Osmotic Pressure 1. Explain the effect that increasing the Na+Cl- concentration had on osmotic pressure and why it has this effect. How well did the results compare with your prediction? __________________________________________________________________________________________________ __________________________________________________________________________________________________ 2. Describe one way in which osmosis is similar to simple diffusion and one way in which it is different. __________________________________________________________________________________________________ __________________________________________________________________________________________________ 3. Solutes are sometimes measured in milliosmoles. Explain the statement, "Water chases milliosmoles"

For vaporization to occur, the particle s of the substance must  heat from the environment.

'Pervaporation characteristics' is determined by __________. Vapor Liquid Equilibrium Solubility Membrane materials Vapor pressure difference

Which of the following statements is incorrect? Solubility is a thermodynamic parameter and gives a measure of the amount of penetrant sorbed by the membrane under equilibrium conditions The diffusivity is a kinetic parameter which indicates how fast a penetrant is transported through the membrane Diffusivity is dependent on the geometry of the penetrant, for as the molecular size increases the diffusion coefficient decreases Diffusivity is dependent on the geometry of the penetrant, for as the molecular size decreases the diffusion coefficient decreases

Which variables affect the rate of diffusion? Check all that apply.Check All That ApplySolubility of moleculesSolubility of moleculesSize of moleculesSize of moleculesConcentration gradientConcentration gradientPolarity of molecules