Unit 4- Thermal Physics And Gases

Question 1

Specific Heat Capacity

Answer 1

Energy required to raise the temperature of a unit mass of a substance by unit temperature rise

Question 2

Thermal equilibrium

Answer 2

Two objects are in thermal equilibrium if there is no net heat flow between the objects

Question 3

Latent heat of vaporisation

Answer 3

The energy required to change a liquid into a gas at constant temperature

Question 4

Latent heat of fusion

Answer 4

The energy required to change a solid into a liquid at constant temperature

Question 5

Internal energy

Answer 5

Sum of the random kinetic energy and potential energy of molecules in a substance

Question 6

Assumptions of the Kinetic model of idea gases

Answer 6

1. Elastic collisions with the walls of the container
2. Forces between molecules are negligible expect during collisions
3. Time of collisions much smaller compared to time between collisions
4. Volume of molecules is negligible compared to volume of container

Question 7

Boyle’s Law

Answer 7

Pressure is inversely proportional to volume for a fixed mass of gas at constant temperature

Question 8

Moles of a substance

Answer 8

6.02x10^23 particles of the substance

Question 9

n in pV=nRT

Answer 9

Number of moles

Question 10

N in pV=NkT

Answer 10

Number of molecules

Question 11

T in gas laws

Answer 11

Absolute temperature

Question 12

Absolute Zero

Answer 12

The temperature at which a substance has minimum internal energy