Thermodynamics

Question 1

The co-efficient B in the volume, thermal expansion formula is what?

Answer 1

3a

Question 2

Zeroth Law

Answer 2

if Ta=Tb and Tb=Tc then Ta=Tc and they are all in thermal equilibrium

Question 3

Ideal Gas Law

Answer 3

particles don’t interact

Question 4

Ideal Gas

Answer 4

low density
pressure is less than 1 atm
temp is not near boiling point

Question 5

Avogadro’s Law

Answer 5

volume of gas at same T and P has same N of particles no matter type of gas

Question 6

relation to PVT for 1 gas and 2 gas

Answer 6

P1V1/T1=P2V2/T2

Question 7

Kinetic Theory of Gases

Answer 7

all particles always in motion

Question 8

Kinetic Theory of Gases applied to the 5 following ideal gas assumptions

Answer 8

particles :
don’t rotate or vibrate
don’t interact
elastic collisions for short t with wall
free to move in any direction
identical particles and large amount

Question 9

How to find the vrms?

Answer 9

square all the velocities, take the average of that, take square root of that

Question 10

Mean free path

Answer 10

mean length of straight part of molecules path

Question 11

Mean Free Time

Answer 11

average time between collision

Question 12

Diffusion

Answer 12

mix of particles

Question 13

Can ideal gases change phases? Why?

Answer 13

No because they don’t exert forces on one another

Question 14

Solid to vapor

Answer 14

Sublimation

Question 15

Liquid to Gas

Answer 15

Evaporating

Question 16

Gas to liquid

Answer 16

Liquification

Question 17

for a phase change if gas temperature is greater/lower than critical tempt gas cannot go to a liquid

Answer 17

greater

Question 18

on a muggy day there is what

Answer 18

increase water vapor

Question 19

relative humidity formula

Answer 19

Pwater/Psup x100%

Question 20

1st law of thermodynamics key 1 pt

Answer 20

work up-work down= w out

Question 21

2nd law of thermodynamics relates to

Answer 21

entropy never decreases, change in entropy always greater than/equal to 0

Question 22

entropy is the

Answer 22

disorderness

Question 23

cold air cannot flow from cold to hot unless

Answer 23

work is done

Question 24

no perfect ___ exists

Answer 24

100% efficient engine

Question 25

2nd law of thermodynamics also talks about the fact an engine can never exceed the

Answer 25

carnot engine

Question 26

3rd law of thermodynamics says there cannot be

Answer 26

a perfect engine

Question 27

equipartition of energy degrees of freedom what 4 types

Answer 27

translational Ke rotational Ke vibrational Ke vibrational Pe

Question 28

all active degrees of freedom have

Answer 28

equal energy

Question 29

energy of a degree of freedom formula

Answer 29

1/2kBT

Question 30

f of a monotomic and diatomic

Answer 30

3, 5

Question 31

Cv of a monotomic and diatomic

Answer 31

3k/2, 5k/2

Question 32

Cp of a monotomic and diatomic

Answer 32

5k/2, 7k/2

Question 33

y of a monotomic and diatomic

Answer 33

1.67, 1.4

Question 34

Number of degrees freedom at low temp, room temp, high temp

Answer 34

1,5,7

Question 35

why are there only 5 degrees of freedom at room temp?

Answer 35

quantum effects preventing vibrational modes being active at these temps

Question 36

specific heat unit and what it is?

Answer 36

c, amount of heat required to raise 1kg by 1K

Question 37

molar specific heat unit and what it is?

Answer 37

C, amount of heat required to raise 1 mole by 1K

Question 38

is there a subscript on molar-specific heat for liquids or solids?

Answer 38

no only v and p for gases

Question 39

R=?

Answer 39

Cp-Cv

Question 40

latent heat

Answer 40

amount of E required for a phase change

Question 41

what does it mean if Q is negative?

Answer 41

heat going from system to environment

Question 42

during a phase change 3 pts

Answer 42

T is constant E internal changes amount of Q=Q transferred to/from each kg of material

Question 43

Q=...

Answer 43

mc change in temp

Question 44

adiabatic

Answer 44

Q=0

Question 45

adiabatic compression

Answer 45

temp increases

Question 46

isothermal ___ so

Answer 46

change temp=0, tf=ti so change eth=0

Question 47

isochronic ___ so

Answer 47

change in volume=0,wtot=0

Question 48

isochronic on a PV diagram is

Answer 48

|

Question 49

isobaric

Answer 49

change in pressure=0

Question 50

isobaric on a PV diagram is

Answer 50

_

Question 51

conduction is molecules...

Answer 51

vibrating due to collisions

Question 52

the insulator has high or low k

Answer 52

low

Question 53

the conductor has high or low k

Answer 53

high

Question 54

convection is

Answer 54

heat transported through the motion of fluids

Question 55

heat engine e formula

Answer 55

Weng/Qh=(Qh-Qc)/Qh=1-(Qh/Qc)

Question 56

e carnot=

Answer 56

1-Tc/Th or Th-Tc/Th x100%

Question 57

refrigerator k

Answer 57

Qc/W= Qc/Qh-Qc

Question 58

heat pump k

Answer 58

Qh/W= Qh/Qh-Qc