The laws and their corollaries

Question 1

What is the First Law of Thermodynamics?

Answer 1

Conservation of energy principle - energy can neither be created nor destroyed during a process; it can only change forms

Question 2

What is the Kelvin-Planck statement of the Second Law of Thermodynamics?

Answer 2

It is impossible for any device that operates on a cycle to receive heat from a single reservoir and produce a net amount of work

Question 3

What is the first corollary of the first law?

Answer 3

There exists a for every system a property called energy

Question 4

What is the first corollary of the second law?

Answer 4

The Clausius statement - it is impossible to construct a device that operates in a cycle and transfers heat from a cooler to a hotter body without work being done on the system by the surroundings

Question 5

What is the second corollary of the first law?

Answer 5

The non-flow energy equation - the change in energy of a system is equal to the difference between the heat added to the system and the work done by the system

Question 6

What is the second corollary of the second law?

Answer 6

It is impossible to construct an engine operating between only two reservoirs which will have a higher efficiency than a reversible engine operating between the same two reservoirs

Question 7

What is the third corollary of the second law?

Answer 7

All reversible engines operating between the same two reservoirs have the same efficiency

Question 8

What is the fourth corollary of the second law?

Answer 8

A scale of temperature can be defined that is independent of any thermometric substance, and which provides an absolute zero of temperature

Question 9

What is the fifth corollary of the second law?

Answer 9

The efficiency of any reversible engine operating between more than two reservoirs must be less than that of a reversible engine operating between two reservoirs which have temperatures equal to the highest and lowest temperatures of the original engine’s reservoirs

Question 10

What is the sixth corollary of the second law?

Answer 10

Whenever a system undergoes a cycle the cyclic integral is negative if the cycle if the cycle is irreversible and positive if reversible

Question 11

What is the seventh corollary of the second law?

Answer 11

There exists a property of equilibrium state of a closed system such that a change in its value is equal to

Question 12

What is the eighth corollary of the second law?

Answer 12

The entropy of any closed system which is thermally isolated from its surroundings either increases or, if its processes are reversible, remains constant