Diffusion Notes and Questions PDF
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Uploaded by MagicalLapisLazuli2793
Army Public School Saddar Karachi
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Summary
These notes and questions cover the topic of diffusion, its characteristics, factors affecting it (like concentration gradient and temperature), examples (like perfume spreading and gas exchange), and its biological importance. It also includes revision questions, which suggests its use for studying.
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Revision Notes and Questions on Diffusion **What is Diffusion?** Diffusion is the movement of particles from a region of higher concentration to a region of lower concentration until equilibrium is reached. **Key Characteristics:** - Does not require energy (passive process). - Occurs in gases...
Revision Notes and Questions on Diffusion **What is Diffusion?** Diffusion is the movement of particles from a region of higher concentration to a region of lower concentration until equilibrium is reached. **Key Characteristics:** - Does not require energy (passive process). - Occurs in gases, liquids, and even across cell membranes. **Factors Affecting Diffusion:** 1. Concentration Gradient: The greater the difference, the faster the diffusion. 2. Temperature: Higher temperatures increase particle movement, speeding up diffusion. 3. Medium: Diffusion is faster in gases than in liquids due to lesser particle interactions. **Examples of Diffusion:** - The spreading of perfume in air. - Dissolving sugar in water. - Exchange of oxygen and carbon dioxide in alveoli of lungs. **Importance of Diffusion in Biology:** - Supplies oxygen and nutrients to cells. - Removes waste products like carbon dioxide. Revision Questions on Diffusion: 1. What is diffusion? 2. Name one example of diffusion in gases and one in liquids. 3. How does the concentration gradient affect the rate of diffusion? 4. Why is diffusion important for living organisms? 5. How does temperature influence the rate of diffusion? 6. Describe an experiment to demonstrate diffusion in water. 7. Why does diffusion not require energy? 8. How is diffusion different from osmosis? 9. Why does diffusion occur faster in gases than in liquids?
