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Questions and Answers
What is the definition of diffusion?
What is the definition of diffusion?
The net movement of a substance from a region of higher concentration to a region of lower concentration, down a concentration gradient.
How is the movement of molecules or ions in diffusion described?
How is the movement of molecules or ions in diffusion described?
The movement is down a concentration gradient.
What causes the random movement of molecules or ions in diffusion?
What causes the random movement of molecules or ions in diffusion?
The natural kinetic energy of the molecules or ions.
What happens to molecules or ions as a result of diffusion?
What happens to molecules or ions as a result of diffusion?
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What factors determine the rate at which a substance diffuses across a membrane?
What factors determine the rate at which a substance diffuses across a membrane?
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Study Notes
Investigating Diffusion
- An experiment to investigate diffusion can be set up using Visking tubing, glucose, and Benedict's test to quantify the concentration of glucose that has diffused into the surrounding water at each time interval.
Facilitated Diffusion
- Carrier proteins can switch between two shapes, allowing the binding site to open to one side of the membrane and then the other.
- This enables facilitated diffusion, which is the movement of molecules down a concentration gradient with the aid of a protein.
- Net diffusion occurs from an area of high concentration to an area of low concentration.
Diffusion
- Diffusion is the net movement of molecules or ions from a region of higher concentration to a region of lower concentration due to random motion.
- It occurs across the cell membrane and tends to reach an equilibrium situation where molecules or ions are evenly spread within a given volume of space.
- The rate of diffusion depends on several factors, which can be investigated through different experiments.
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Description
Learn how to set up an experiment to investigate diffusion and estimate the concentration of glucose that has diffused into the water surrounding Visking tubing. Explore the process quantitatively using the semi-quantitative Benedict's test at different time intervals.
