Chapter 8 First Law Of Thermodynamics

Question 1

Internal energy

Answer 1

Sum of the random distribution of kinetic and potential energy of all the atoms or molecules

Question 2

Specific heat capacity and formula

Answer 2

Double energy per unit mass to raise the temperature of a substance by 1 degree Kelvin

Q=mc∆T

Question 4

Specific latent heat of fusion (vaporization) and formula

Answer 4

Amount of thermal energy per unit mass required to change the substance from solid phase to liquid phase (liquid phase to vapor phase) at constant temperature

L=Q/m

Question 5

First law of thermodynamics and formula

Answer 5

Increase in internal energy is equal to sum of heat supplied to the system and work done on the system

∆U = Q+W

Question 6

Thermodynamics processes

Answer 6

Isothermal:
Temperature is constant throughout

Isovolumetric:
Volume of gas remains constant

Isobaric:
Pressure of gas remains constant

Adiabetic:
No heat exchange

Cyclic:
System goes back to original state