6.2 first law of thermodynamics

Question 1

what makes up the internal energy in a system?

Answer 1

internal energy of a system is the sum of the kinetic energy due to the random motion of molecules and the potential energy due to intermolecular forces of attraction

Question 2

define specific latent heat

Answer 2

specific latent heat of a substance is defined as the thermal energy per unit mass required to change its state at CONSTANT TEMPERATURE

Question 3

state the first law of thermodynamics

Answer 3

the increase in internal energy of a system is the sum of the heat supplied to the system and the work done ON the system. the internal energy of a system only depends on its state.

(work done BY system = p(Vf - Vi), area under p-V graph)