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Physical Pharmacy Quiz

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Questions and Answers

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?

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?

It decreases (correct)

It remains constant

It becomes zero

It increases

What is the critical temperature of a substance?

<p>The temperature above which a liquid cannot exist, regardless of pressure</p> Signup and view all the answers

What is the effect of applying pressure to a gas for liquefaction?

<p>Molecules come within the sphere of van der Waals forces and pass into the liquid state</p> Signup and view all the answers

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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Description

Test your knowledge of the liquid state of matter and the liquefaction of gases in physical pharmacy with this quiz. Explore the transitions from solid to liquid and from liquid to gas, and learn about the effects of temperature and pressure on these processes.