Thermodynamics

Question 1

What is the first of law thermodynamics? Define each part

Answer 1

ΔU = Q − W

Question 2

What are the positive and negative values of Heat (Q) Work (W) and Internal Energy (ΔU )

Answer 2

Positive Q- heat is put into the system
Positive ΔU - Increasing temperature
Positive W- Work done by the system

Negative Q- heat leaves system
Negative ΔU - temperature decreases
Negative W= work done on the system

Question 3

What is the Zeroth Law of Thermodynamics?

Answer 3

Objects in thermal contact are in thermal equilibrium when temperatures are the same

Question 4

What is the Second Law of Thermodynamics?

Answer 4

Objects in thermal object but no in thermal equilibrium will eventually do so- the object with the higher heat will transfer heat until both objects are the sam.e

Question 5

Heat Unit

Answer 5

Joule (J)

Question 6

What is a Cal to a cal to a Joule?

Answer 6

1 Cal= 10^3 cal= 4184 J

Question 7

What is the difference between conduction, convection, and radiation?

Answer 7

Conduction requires actual touch, transferring heat through physical contact. Convection is the transfer of heat by the physical motion of - . Radiation is the transfer of heat energy by electromagnetic waves.

Question 8

What is specific heat?

Answer 8

(c) The amount of heat required to raise 1 gram of a substance up 1 unit K

Question 9

What is the specific heat of water?

Answer 9

1 cal/gK or 4.184 J/ gK

Question 10

Equation of heat transfer with specific heat

Answer 10

q=mcΔT

Question 11

Equation for heat in a system during phase change

Answer 11

q=mL