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Chapter 11: Problem 34

As the temperature of a liquid increases, what happens to the vapor pressure?

Short Answer

Expert verified
As the temperature of a liquid increases, the vapor pressure also increases due to an increase in the kinetic energy of the particles.

Step by step solution

01

Explain Kinetic Theory

The kinetic theory of gases explains that the temperature of a liquid is directly related to the kinetic energy of its particles. When a liquid is heated, the kinetic energy of its particles increases.
02

Discuss that particles move

As a liquid is heated and the kinetic energy of the particles increases, these particles will move faster and more of them will have the energy to escape the liquid; transitioning to a gas phase.
03

Relationship between temperature and vapor pressure

As more particles escape from the liquid, the concentration of vapor molecules above the liquid increases, resulting in an increased vapor pressure. Therefore, as the temperature of a liquid increases, the vapor pressure increases correspondingly.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Kinetic Theory
The kinetic theory of matter provides an essential explanation of the behavior of particles in different states, such as solids, liquids, and gases. According to this theory, matter is made up of a large number of small particles鈥攁toms or molecules鈥攖hat are in constant motion.
In a liquid, these particles are relatively close to each other but still have the freedom to move around. When a liquid is heated, the temperature rise translates to an increase in the kinetic energy of these particles. This means that they move more vigorously as the temperature climbs.
  • The particles gain energy and move faster.
  • This movement leads to increased collisions between particles.
  • Some particles gain enough energy to overcome the attractive forces holding them in the liquid, enabling them to escape into the gaseous state.
Temperature and Phase Change
Temperature plays a crucial role in phase changes, such as transitioning from a liquid to a gas. When you heat a liquid, it absorbs energy, leading to a rise in temperature.
This increase in temperature is related to an increase in the average kinetic energy of the particles in the liquid. As more heat is supplied, more particles gain sufficient energy to break free from the liquid state and enter the gas phase.
  • The point at which this significant change occurs is known as the boiling point.
  • This happens when the vapor pressure of the liquid equals the atmospheric pressure.
  • As a result, bubbles can form within the body of the liquid, and it turns into a gas or vapor.
Relationship between Temperature and Vapor Pressure
Vapor pressure is the pressure exerted by vapor molecules when in equilibrium with its liquid or solid form. This forms due to the evaporation of molecules from the liquid surface.
As the temperature of a liquid increases, the kinetic energy of molecules increases as well, allowing more of them to escape into the vapor phase. This abundance of vapor molecules above the liquid increases the vapor pressure.
  • Higher temperatures result in higher vapor pressures.
  • It is this increased pressure that makes liquids boil when heated to their boiling points.
  • In summary, as temperature rises, the energy input allows more molecules to transition to the gas phase, thus elevating the vapor pressure accordingly.

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