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Questions and Answers
What are the two ways for the liquefaction of gases?
What are the two ways for the liquefaction of gases?
- Cooling and applying pressure (correct)
- Heating and reducing pressure
- Increasing volume and reducing temperature
- Increasing temperature and reducing volume
Why do liquids occupy a definite volume?
Why do liquids occupy a definite volume?
- Due to van der Waals interaction forces (correct)
- Because of increased kinetic energy
- Because they have a fixed shape
- Due to the absence of intermolecular forces
What happens to the velocity of gas molecules during liquefaction?
What happens to the velocity of gas molecules during liquefaction?
- It decreases (correct)
- It remains constant
- It becomes zero
- It increases
What is the critical temperature of a substance?
What is the critical temperature of a substance?
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What is the effect of applying pressure to a gas for liquefaction?
What is the effect of applying pressure to a gas for liquefaction?
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Study Notes
Liquefaction of Gases
- There are two ways to liquefy gases: by increasing the pressure or by decreasing the temperature.
- The cooling process slows down the velocity of gas molecules, allowing them to come together and form a liquid.
Properties of Liquids
- Liquids occupy a definite volume because their molecules are closely packed and have a fixed amount of space between them.
Critical Temperature
- The critical temperature of a substance is the temperature above which it cannot be liquefied, no matter how much pressure is applied.
Effect of Pressure on Gases
- Applying pressure to a gas increases the collisions between molecules, allowing them to stick together and form a liquid.
- Pressure is an important factor in liquefaction, as it helps to overcome the kinetic energy of the gas molecules and bring them together.
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