Thermodynamics Flashcards
(21 cards)
ΔE is negative when
The system is doing work
ΔE is positive when
Work is being done on
An increase in temperature, volume, and the # of atoms equals what in terms of entropy
An increase in entropy (ΔSsys)
Will a high Temperature (T > 273K) lead to a positive or negative ΔSuniv
ΔSuniv > 0
Will a low Temperature (T < 273K) lead to a positive or negative ΔSuniv?
ΔSuniv < 0
Is a process nonspontaneous or spontaneous when ΔG < 0
Forward spontaneous process
Is a process nonspontaneous or spontaneous when ΔG > 0
Forward nonspontaneous process
The addition or removal of heat changes the amount of entropy in a system, but
The amount of change depends on the temperature of the surroundings
If ΔH is negative (exothermic), is it good or bad for entropy
It’s usually good for entropy
If ΔH is positive (endothermic), is it good or bad for entropy
It’s usually bad for entropy
What does more moles on the product side mean for ΔSsys? Is it positive or negative?
ΔSsys is positive
What is ΔSsurr for an exothermic reaction? Positive or negative?
ΔSsurr is positive
What is ΔSsurr for an endothermic reaction? Positive or negative?
Can the internal energy decrease or increase
ΔSsurr is negative
(The internal energy of the system can decrease)
In an exothermic reaction are the bonds broken or formed? Is ΔH positive or negative?
Bonds are formed and ΔH is negative
In an endothermic reaction are the bonds broken or formed? Is ΔH positive or negative?
Bonds are broken and ΔH is positive
What is the formula for ΔSsurr?
-ΔH / T
What is the formula for W
W = n! / (n - r)! r!
n = Available adsorption sites
r = Occupied sites
At the boiling point, the Gibbs free energy change (ΔG) is
Zero
If ΔSuniv > 0, is the process spontaneous or nonspontaneous
Spontaneous
If ΔSuniv < 0, is the process spontaneous or nonspontaneous
Nonspontaneous
The equilibrium constant (𝐾) for a reaction is only affected by temperature T/F
True
