1) Diffusion is the net movement of ____ a) Molecules b) Water molecules c) Solute molecules 2) What does diffusion require? a) A concentration gradient b) Lots of water c) Lots of energy 3) What is a passive process? a) Requires lots of energy b) Requires no energy c) Requires solute 4) Molecules move from an area of _____ concentration a) High b) Low c) Equal 5) to an area of ____ concentration a) High b) Low c) Equal 6) What model can be used to investigate the rate of diffusion? a) Meselson and Stahl experinment b) The bell jar model c) The visking tubing model 7) What factor affects the rate of diffusion? a) Temperature b) pH c) Volume of water

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