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Questions and Answers
What primarily drives the movement of molecules during diffusion?
What primarily drives the movement of molecules during diffusion?
- Molecular weight of the substances
- Random motion of molecules (correct)
- External pressure differences
- Energy from surrounding heat
When a steep concentration gradient exists, how does it affect the rate of diffusion?
When a steep concentration gradient exists, how does it affect the rate of diffusion?
- It causes no change in the rate of diffusion.
- It reverses the direction of diffusion.
- It slows the rate of diffusion significantly.
- It increases the rate of diffusion. (correct)
Which of the following substances is used as an example to demonstrate diffusion in gases?
Which of the following substances is used as an example to demonstrate diffusion in gases?
- Bromine (correct)
- Nitrogen
- Oxygen
- Water
What is the concentration gradient in diffusion?
What is the concentration gradient in diffusion?
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What is the observed state of bromine at room temperature?
What is the observed state of bromine at room temperature?
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Study Notes
###Â Diffusion
- Diffusion is the movement of molecules from a region of higher concentration to a region of lower concentration.
- This movement continues until the molecules are evenly distributed.
- Diffusion is driven by the random motion of molecules.
- Molecules have energy and are always moving in random directions.
###Â Diffusion in Gases
- Bromine is a volatile liquid at room temperature.
- When bromine is poured into a gas jar and inverted over another jar, the bromine vaporizes and diffuses into the upper jar.
- The rate of diffusion depends on the concentration gradient.
- A steep concentration gradient leads to rapid diffusion.
- A less steep gradient leads to slower diffusion.
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