Quiz 4

Question 1

Entropy (s)

Answer 1

• describes the number of arrangements (positions or energy levels) avalible in a system.
• the randomness or disorder of a system
• Soilds are more ordered than gases

Question 2

Second Law of Thermodynamics

Answer 2

in any spontaneous process the entropy of the universe increases
ΔSuniv > 0

Question 3

How do you determine ΔSuniv

Answer 3

ΔSuniv=ΔSsystem+ΔSsurroundings

Question 4

Entropy Laws

Answer 4

1. S increase as temp rises
2. S increases as physical states become less ordered (soild to liquid to gas)
3. S often increases when substances are mixes (exept when gasses disolve in liquid)
4. S increases as the number of molecules increases
5. S usually increases as molcules or atoms get bigger and more complex

Question 5

qsystem < 0

Answer 5

• Exothermic
• qsurroundings > 0

Question 6

qsystem > 0

Answer 6

• Endothermic
• qsurroundings < 0

Question 7

If ΔG < 0

Answer 7

• ΔSuniv > 0
• Spontaneous
• Exothermic
• Favorable

Question 8

If ΔG > 0

Answer 8

• ΔSuniv < 0
• Non spontaneous
• Endothermic
• Unfavorable

Question 9

If ΔG = 0

Answer 9

• ΔSuniv = 0
• No tendency for anything to happen
• Equlilbrium

Question 10

If
* ΔHsys < 0
* ΔSsys > 0

Answer 10

Then
* ΔG < 0
* Spontaneous

Question 11

If
* ΔHsys >0
* ΔSsys < 0

Answer 11

Then
* ΔG > 0
* non-spontaneous

Question 12

If
* ΔHsys <0
* ΔSsys < 0

Answer 12

Then
* ΔG depends
* non-spontaneous at high temps and spomtaneous at low temps

Question 13

If
* ΔHsys >0
* ΔSsys > 0

Answer 13

Then
* ΔG depends
* non-spontaneous at low temps and spontaneous at high temps

Question 14

In ΔG+ΔH-TΔS which variable needs to be converted?

Answer 14

ΔS, convert from J to KJ

Question 15

What are coupled reactions?

Answer 15

they make unfavorable processes happen