## What is not an assumption made by the kinetic molecular theory of gases?

The statement, ‘At high pressure, gas particles are difficult to compress. ‘ is not an assumption of the kinetic theory of gases. In the postulates of the kinetic theory of gases, reference is made to low-pressure case but there is no reference to high-pressure case.

What are the 5 assumptions of the kinetic theory of gases?

The kinetic-molecular theory of gases assumes that ideal gas molecules (1) are constantly moving; (2) have negligible volume; (3) have negligible intermolecular forces; (4) undergo perfectly elastic collisions; and (5) have an average kinetic energy proportional to the ideal gas’s absolute temperature.

### How do the gas particles move?

In gases the particles move rapidly in all directions, frequently colliding with each other and the side of the container. With an increase in temperature, the particles gain kinetic energy and move faster.

Do molecules in gas repel each other?

The gas particles neither attract or repel one another (they possess no potential energy). The motion of the gas particles is completely random, so that statistically all directions are equally likely.

## Why is gas compressible?

Gases are compressible because most of the volume of a gas is composed of the large amounts of empty space between the gas particles. At room temperature and standard pressure, the average distance between gas molecules is about ten times the diameter of the molecules themselves.

Why are gases highly compressible in nature?

Gases are highly compressible to large vacant spaces between the molecules of a gas. As a result, its intermolecular force of attraction is less, and it has more distance between the molecules. Therefore, it is simple to compress the gas.

### How do gases behave during collisions?

Gases are in rapid motion, and they undergo elastic collisions with each other and the walls of the container; that is, momentum and energy is transfered not lost during collisions. Gases expand spontaneously to fill any container (rapid motion).

How does the temperature affect the kinetic energy of gas molecules?

As the temperature of the gas increases, the particles gain kinetic energy and their speed increases. This means that the particles hit off the sides more often and with greater force.

## What causes the gas molecules to move slower?

Since all gases have the same average kinetic energy at the same temperature, lighter molecules move faster and heavier molecules move slower on average.

Why do gases expand?

Heating a gas increases the kinetic energy of the particles, causing the gas to expand. In order to keep the pressure constant, the volume of the container must be increased when a gas is heated. This law explains why it is an important safety rule that you should never heat a closed container.

### Why do gases have high kinetic energy?

Gas particles are in constant rapid motion in random directions. The fast motion of gas particles gives them a relatively large amount of kinetic energy.

Do gas particles move fast or slow?

## Why do gases not have a fixed shape?

Due to the weak internuclear force of attraction, the gaseous particles have enough kinetic energy and they can move in any direction without any restrictions. Hence, the gases do not have a fixed shape and fixed volume.

Why do gases deviate from ideal behaviour?

Gases deviate from the ideal gas behaviour because their molecules have forces of attraction between them. At high pressure the molecules of gases are very close to each other so the molecular interactions start operating and these molecules do not strike the walls of the container with full impact.

### Why does gas expand in space?

Charles’ law (Gay-Lussac’s law) Heating a gas increases the kinetic energy of the particles, causing the gas to expand. In order to keep the pressure constant, the volume of the container must be increased when a gas is heated.

Why are gases able to diffuse quickly?

Diffusion in gases is quick because the particles in a gas move quickly. It happens even faster in hot gases because the particles of gas move faster.

## Why do gas molecules move faster at higher temperatures?

The average kinetic energy of the particles in a gas is proportional to the temperature of the gas. Because the mass of these particles is constant, the particles must move faster as the gas becomes warmer.

How can you increase the kinetic energy of gas?

Volume versus Temperature: Raising the temperature of a gas increases the average kinetic energy and therefore the rms speed (and the average speed) of the gas molecules. Hence as the temperature increases, the molecules collide with the walls of their containers more frequently and with greater force.

### Why do gases spread faster than liquids?

The atoms and molecules in gases are much more spread out than in solids or liquids. They vibrate and move freely at high speeds. A gas will fill any container, but if the container is not sealed, the gas will escape. Gas can be compressed much more easily than a liquid or solid.

How does kinetic molecular theory explain gas laws?

– The physical behaviour of gases is explained by the kinetic molecular theory of gases. – The number of collisions that gas particles make with the walls of their container and the force at which they collide determine the magnitude of the gas pressure. – Temperature is proportional to average kinetic energy.

## What are facts about kinetic theory of gases?

The kinetic theory of gases is a simple, historically significant classical model of the thermodynamic behavior of gases, with which many principal concepts of thermodynamics were established.The model describes a gas as a large number of identical submicroscopic particles (atoms or molecules), all of which are in constant, rapid, random motion.Their size is assumed to be much smaller than the

What are the assumptions of the kinetic theory of gases?

Gases consist of a large number of tiny particles (atoms and molecules).

• These molecules are in constant random motion which results in colliding with each other and with the walls of the container.
• The collisions between the molecules and the walls are perfectly elastic.
• The average kinetic energy of the gas particles changes with temperature.
• ### What are the 4 points of the kinetic molecular theory?

Gases consist of large numbers of tiny particles that are far apart relative to their size.

• Collision between gas particles and between particles and container walls are elastic collisions.
• Gas particles are in continuous motion.
• There are no forces of attraction between gas particles.