Physical States and Properties Diffusion I: Random molecular movement and influences on diffusion rate by Heather MacNeill Falconer, M.A./M.S., Gina Battaglia, Ph.D., Anthony Carpi, Ph.D. Reading Quiz Teach with this 1. Diffusion is a process that only occurs in liquid substances. true false 2. When molecules diffuse through a substance, they appear to move down a concentration gradient. This is because the molecules are consciously moving to an area of the substance where there is more space. chemically interacting with the substance and changing it. randomly moving and colliding with one another. increasing the substance’s temperature, which causes the molecules to move. 3. The “random walk” of particles refers to the spontaneous movement of particles as they interact with their environment. the direct movement of particles from Point A to Point B. a property of matter unique to liquids. the average distance a particle travels between impacts with other particles. 4. A concentration gradient no longer exists when no more molecules are being added to the substance. all the molecules have reached equilibrium and stopped moving. the color of the substance has evened out. the added molecules have evenly spread throughout the substance and equilibrium has been reached. 5. Which of the following factors does NOT have a direct influence on the rate of diffusion? Molecule size Color Temperature Barriers in the substance 6. Which of the following examples would diffuse the FASTEST? Salt into salt water Salt water into salt water Salt into tap water Salt water into tap water 7. The diffusion rate differs between gases, liquids, and solids because the temperatures are different in each form. molecules are different sizes in each form. number of barriers in the molecule's way differ. distance molecules have to travel before colliding with another molecule differ. Score Quiz
