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Questions and Answers
What is the primary driving force behind the movement of particles in diffusion?
What is the primary driving force behind the movement of particles in diffusion?
- Random movement of particles (correct)
- Temperature fluctuations
- Presence of a membrane
- Electrostatic forces
How does an increase in temperature affect the rate of diffusion?
How does an increase in temperature affect the rate of diffusion?
- It decreases the kinetic energy of the molecules.
- It restricts the movement of molecules.
- It increases the size of the molecules.
- It increases the rate of diffusion. (correct)
If a substance like alcohol is held in hand, what effect does this have on its diffusion rate?
If a substance like alcohol is held in hand, what effect does this have on its diffusion rate?
- It decreases the diffusion rate due to external temperature.
- It has no effect on the diffusion rate.
- It increases the diffusion rate as the substance gains heat. (correct)
- It creates barriers that slow down diffusion.
Which of the following factors does NOT affect the rate of diffusion?
Which of the following factors does NOT affect the rate of diffusion?
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What occurs when particles diffuse down a concentration gradient?
What occurs when particles diffuse down a concentration gradient?
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Study Notes
Diffusion
- Movement of particles from an area of high concentration to low concentration.
- Driven by random movement of particles.
- Movement occurs down a concentration gradient.
Factors Affecting Diffusion Rate
- Temperature: Higher temperature increases diffusion rate.
- Higher temperature leads to increased kinetic energy of molecules.
- Example: Holding a tube of alcohol in your hand increases diffusion rate as the alcohol molecules gain heat.
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