Thermal Energy & Thermodynamics

Question 1

Zeroth Law of Themodynamics

Answer 1

If bodies A and B are seperately in thermal equiblirum with body C, then bodies A and B are in thermal equilibrium with each other

Question 2

Mean KE of a molecule

Answer 2

1/2 mc =3/2kT

Question 3

Heat capacity and specific heat capacity

Answer 3

Heat capacity of a body is the amount of thermal energy required to raise its temperature by 1K
Specific heat capacity is the amount of thermal energy required to raise its temperature of 1kg of it by 1K
Q=mcT

Question 4

Specific latent heat

Answer 4

Defined as the thermal energy required to convert 1kg of a substance to another phase without a change in temperature
Q=mL

Question 5

Internal energy of a system

Answer 5

Sum of a random distribution of kinetic and potential energies associated with the molecules of a system

Question 6

Internal energy formula

Answer 6

U=3/2 nRT= 3/2 NkT = 3/2 pV

Question 7

First Law of thermodynamics

Answer 7

Increase in internal energy of a closed system is the sum of the heat supplied to the system and work done on the system
Delta U =Qto + Won

Question 8

Work done on gas

Answer 8

W=-p delta V
If compression->work done on (+ve W)
If expansion->work done by (-ve W)

Question 9

Formulas for ideal vs non ideal gas

Answer 9

Whole: Delta U = PE+KE
Ideal: PE=0
Delta U = 3/2 nRT = 1/2 m