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2 cards from this section. Quick, good the night before a test.
What is the basic equation of diffusion discussed in this section?
Look for the relationship between concentration and diffusion in time.
What does D represent in the diffusion equation?
Think about how quickly substances spread.
What does the variable C represent in the diffusion equation?
Remember the basic definition of concentration.
True or False: The diffusion coefficient (D) is irrelevant in determining how quickly substances diffuse.
Think about how fast a substance spreads.
Consider a body of water contaminated with a substance having a diffusion coefficient of 0.1 cm²/s. If the concentration at the source is 100 mg/L and in the surrounding water is 10 mg/L, estimate when the concentration will equalize within a distance of 10 cm. Use the diffusion equation appropriately.
Experiment with visualizing the diffusion process over time to assist in your calculation.
A drug is released from a pill in a controlled manner with a diffusion coefficient of 2.0 x 10^-6 cm²/s. If it takes 2 hours for the drug concentration at a certain distance to reach 5 mg/L from an initial dose concentration of 200 mg/L, assess the effectiveness of the drug by evaluating diffusion parameters.
Focus on how releasing drugs slowly could result in consistent concentration levels that attain therapeutic goals.
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