Chapter 15 - Thermodynamics

Question 1

1st Law of Thermodynamics

Answer 1

• The change in the internal energy of a system = the
  heat flow into the system + the work done on a
  system.
• When heat flows to or from a system, the amount
  of energy the system gains or loses is equal to the
  amount of heat transferred

Question 2

2nd Law of Thermodynamics

Answer 2

• The total amount of disorder in the universe never
  decreases
• Spontaneous heat flow ALWAYS travels from
  hotter to colder, and it is always irreversible

Question 3

Entropy

Answer 3

• When 2 systems of different temps are in thermal
  contact, heat always flows from the hotter system
  to the cooler system
• There is no change in the total energy of the 2
  systems; energy just flows out of one and into the
  other.

Question 4

3rd Law of Thermodynamics

Answer 4

• It is impossible to cool a system to absolute zero
• Cold is just the absence of heat