Thermal Physics: Basic Concepts

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In the kinetic model of an ideal gas, it is assumed that

A. the forces between the molecules of the gas and the container are always zero.

B. the intermolecular potential energy of the molecules of the gas is constant.

C. the kinetic energy of a given molecule of the gas is constant.

D. the momentum of a given molecule of the gas is constant.

Clear selection

What are the conditions of temperature and pressure at which the behaviour of a real gas approximates to the behaviour of an ideal gas? *

1 point

A. Low pressure and low temperature

B. Low pressure and high temperature

C. High pressure and low temperature

D. High pressure and high temperature

A liquid-in-glass thermometer is in thermal equilibrium with some hot water. The thermometer is left in the water. The water cools to the temperature of the surroundings. Which of the following is unlikely to be true for the thermometer? *

1 point

A. It is in thermal equilibrium with the water.

B. It is in thermal equilibrium with the surroundings.

C. It is at the same temperature as the water.

D. It has the same thermal capacity as the water.

The specific latent heat of a substance is defined as the energy required at constant temperature to

1 point

A. change the phase.

B. change the phase of 1 kg.

C. change the phase of 1 m^3

D. change the phase of 1 kg every second.

Clear selection

The total potential energy and random kinetic energy of the molecules of an object is equal to the *

1 point

A. heat energy in the object.

B. internal energy of the object.

C. thermal energy in the object.

D. work stored in the object.

An ideal gas has an absolute temperature T. The average random kinetic energy of the molecules of the gas is *

1 point

A. independent of T.

B. equal to T.

C. proportional to T.

D. inversely proportional to T.

A sealed container contains water at 5 °C and ice at 0 °C. This system is thermally isolated from its surroundings. What happens to the total internal energy of the system? *

1 point

A. It remains the same.

B. It decreases.

C. It increases until the ice melts and then remains the same.

D. It increases.

Molar mass is defined as *

1 point

A. the number of particles in one mole of a substance.

B. 1/12 the mass of one atom of carbon-12.

C. the mass of one mole of a substance.

D. the number of particles in 1/12 of a mole of carbon-12

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