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Questions and Answers
What phenomenon describes the movement of molecules from a higher concentration to a lower concentration?
What phenomenon describes the movement of molecules from a higher concentration to a lower concentration?
- Evaporation
- Diffusion (correct)
- Osmosis
- Convection
What effect does a steep concentration gradient have on the rate of diffusion?
What effect does a steep concentration gradient have on the rate of diffusion?
- It reverses the direction of diffusion.
- It allows diffusion to happen at a rapid rate. (correct)
- It causes diffusion to occur more slowly.
- It halts diffusion completely.
When bromine is poured into a gas jar, what happens to the bromine liquid?
When bromine is poured into a gas jar, what happens to the bromine liquid?
- It mixes uniformly with the water in the jar.
- It escapes the container entirely.
- It vaporizes and diffuses into the air. (correct)
- It immediately solidifies.
Which statement best describes the nature of molecules in diffusion?
Which statement best describes the nature of molecules in diffusion?
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What is created when there is a difference in concentrations of molecules between two areas?
What is created when there is a difference in concentrations of molecules between two areas?
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Study Notes
Diffusion
- Liquids and gases are made of tiny particles called molecules.
- These molecules have energy and move randomly.
- This random movement causes molecules to spread out and fill available space.
- Diffusion is the movement of molecules from an area of higher concentration to an area of lower concentration.
- This movement continues until the molecules are evenly distributed.
- Bromine is a volatile liquid that is orange-brown at room temperature.
- When bromine is poured into a gas jar and another gas jar is placed over the top, the bromine vaporizes.
- Bromine molecules then diffuse and spread into the upper gas jar.
- The difference in concentrations of molecules in two areas is called a concentration gradient.
- A steeper concentration gradient leads to faster diffusion.
- A less steep concentration gradient leads to slower diffusion.
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