Chapter 9: First Law of Thermodynamics

Question 1

Define specific heat capacity

Answer 1

The specific heat capacity of a substance is the quantity of heat required to produce a unit change in temperature per unit mass of that substance

(Q = mcΔT)

Question 2

Define specific latent heat of fusion

Answer 2

The amount of heat required per unit mass to change a substance from the solid state to the liquid state without a change in temperature

(Q = mL where L is specific latent heat)

Question 3

Define specific latent heat of vaporization

Answer 3

The amount of heat required per unit mass to change a substance from the liquid state to the vapor state without a change in temperature

(Q = mL where L is specific latent heat)

Question 4

State the First Law of Thermodynamics

Answer 4

In a closed system, the increase in internal energy is equal to the sum of the heat supplied to the system and the work done on the system

(ΔU = Q + W)

Question 5

Defn of Internal Energy

Answer 5

The sum of the random distribution of microscopic kinetic energy and microscopic potential energy of ALL the atoms or molecules.