Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
21 Cards in this Set
- Front
- Back
|
S is expected to be greatest for dissolving which of the following salts
NaCl MgS CaCl2 NaF |
CaCl2 |
|
|
Which species has Gof = 0 at 25 C and P = 1 atm?
O2(l) CO(g) F2(s) Br2(l) |
Br2(l) |
|
|
Which one of the species listed has Hfo = 0 at 25 C and P = 1 atm?
Br2(s) SO2(s) F2(g) CO(g) |
F2(g) |
|
|
Which of the following does NOT have units of joules/mol?
work G S H |
/\S |
|
|
The equation E = q + w indicates that:
the entropy of the universe always increases energy is conserved it is impossible to convert work to heat it is impossible to convert heat to work |
energy is conserved |
|
|
Which of the following is TRUE for spontaneous reactions?
both entropy and enthalpy tend to decrease both entropy and enthalpy tend to increase entropy tends to decrease and enthalpy tends to increase entropy tends to increase and enthalpy tends to decrease |
entropy tends to increase and enthalpy tends to decrease |
|
|
Which species has Gof = 0 at 25 C and P = 1 atm?
O2(l) CO(g) F2(s) S8(s) |
S8(s) |
|
|
A reaction that is spontaneous:
will be a very fast reaction will favor products will have a G > 0 will favor reactants |
will favor products |
|
|
Which of the following is the equation that corresponds to /\Hfo(S2Cl2(s))?
2S(g) + 2 Cl2(g) -> S2Cl2(s) 1/4S8(s) + 2 Cl(g) -> S2Cl2(s) 1/4S8(s) + Cl2(g) -> S2Cl2(s) S2(g) + Cl2(g) -> S2Cl2(s) |
1/4S8(s) + Cl2(g) -> S2Cl2(s) |
|
|
According to the second law of thermodynamics:
Energy cannot be created or destroyed in a chemical reaction Entropy is at a minimum at absolute zero The entropy of the universe always increases The internal energy equals the sum of heat plus work |
the entropy of the universe always increases |
|
|
Which one of the following is most closely related to the equilibrium constant?
G H E S |
/\G |
|
|
Which one of the following is a measure of the maximum amount of work available from a process?
G H E S |
/\G |
|
|
In which case does entropy increase?
ice forms on a pond dew forms on grass a gas is compressed from a volume of 2 L to 1 L water and alcohol are mixed to form a solution |
water and alcohol are mixed to form a solution |
|
|
A reaction that is spontaneous:
will be very rapid as written will have an equilibrium constant > 1 will always have a large equilibrium constant will always favor reactants |
will have an equilibrium constant >1 |
|
|
Which of the following statements is FALSE?
If G = 0, then the temperature must be equal to zero G is a measure of the maximum amount of work available from a system entropy is at a minimum at absolute zero if G is positive then Keq < 1 |
if /\G=0, then the temperature must be equal to zero |
|
The figure on the right shows the free energy of a system in terms of the progress of a reaction. At what point in the figure is the system farthest from equilibrium. (A, B, C, D, E)
|
A |
|
|
Which one of the following is TRUE?
If H and S are both positive then the reaction will always be spontaneous H is a measure of the maximum work available from a reaction H is a measure of the change in bond energy If a reaction is spontaneous at low T it must also be spontaneous at high T |
/\H is a measure of the change in bond energy |
|
|
If H is positive and S is negative for a reaction, then
the reaction is spontaneous at all temperature the reaction is spontaneous at low temperatures the reaction is spontaneous at high temperatures the reaction is NOT spontaneous at any temperature |
the reaction is not spontaneous at any temperature |
|
|
.In which case does entropy DECREASE for the system described?
a liquid boils a gas is expanded from a volume of 0.5 L to 1 L a salt is dissolved in water 2 O(g) -> O2(g) |
2O(g) -> O2(g) |
|
|
Which one of the following reactions most likely has S < 0?
PCl5(g) -> PCl3(g) + Cl2(g) 2 CO2(g) + 2 H2O(l) -> 2 CH4(g) + 2 O2(g) 2 NH3(g) + Cl2(g) -> 2 NH4Cl(s) 2 HCl(aq) + Ca(s) -> CaCl2(aq) + H2(g) |
2NH3(g) + Cl2(g) -> 2NH4Cl(s) |
|
|
If Keq = 100.0 then /\Go =?
-11.4 kJ/mol 5.7 kJ/mol 8.77 x 10-5 kJ/mol 1.7 x 104 kJ/mol |
-11.4kJ/mol |
