Solutions
Consider pure water separated from an aqueous solution by a semipermeable membrane. After some time has passed, what (if anything) will happen to the concentration of the sugar solution?
A) It will decrease
B) It will increase
C) It will remain the same
D) It cannot be determined
A) It will decrease
Which will drive the equilibrium to form more Cu(s)?
Cu2O (s) + CO (g) <-> 2Cu (s) + CO2 (g)
A) remove CO (g)
B) remove CO2 (g)
C) add a catalyst
D) increase the volume of the container
B) remove CO2 (g)
Which change is likely to be accompanied by an increase in entropy?
A) N2 (g) + 3H2 (g) -> 2NH3 (g)
B) Ag+ (aq) + Cl- (aq) -> AgCl (s)
C) CO2 (s) -> CO2 (g)
D) H2O (g) -> H2O (l)
C) CO2 (s) -> CO2 (g)
What is a proper description of chemical equilibrium?
A) The reaction has stopped.
B) The concentrations of products and reactants are equal.
C) The rates of the forward and reverse reactions are zero.
D) The rates of the forward and reverse reactions are the same.
D) The rates of the forward and reverse reactions are the same.
What was the name of Taylor Swift's 2025 album?
The Life of a Showgirl
Which 0.1 molal aqueous solution will have the lowest freezing point?
A) Al(NO3)3
B) CaCl2
C) C2H5OH
D) NaCl
A) Al(NO3)3
What is the equilibrium expression for this reaction?
Ni(CO)4 (g) <-> Ni(s) + 4CO (g)
A) [CO]4/[Ni(CO)4]
B) [Ni][CO]4/[Ni(CO)4]
C) [Ni(CO)4]/[CO]4
D) [Ni(CO)4]/[Ni][CO]4
A) [CO]4/[Ni(CO)4]
Which statement is correct for the reaction below under standard conditions?
2Cl2 (g) + 2NO (g) -> N2 (g) + 2Cl2O (g), ΔH = -22.0 kJ/mol
A) The reaction is spontaneous at all temperatures.
B) The reaction is only spontaneous at low temperatures.
C) The reaction is only spontaneous at high temperatures.
D) The reaction is not spontaneous at any temperatures.
B) The reaction is only spontaneous at low temperatures.
Which substance is most soluble in water?
A) ethane, CH3CH3
B) ethanol, CH3CH2OH
C) n-butane, CH3CH2CH2CH3
D) 1-butanol, CH3CH2CH2CH2OH
B) ethanol, CH3CH2OH
What is my last name?
Gundrum
What is the mole fraction of water in 200 g of 89% (by mass) ethanol, C2H5OH?
A) 0.11
B) 0.24
C) 0.32
D) 0.76
B) 0.24
Given the reaction and equilibrium constant:
2SO3 (g) <-> 2SO2 (g) + O2 (g), Kc = 2.3 x 10-7
What is the equilibrium constant for this reaction at the same temperature?
SO3 (g) <-> SO2 (g) + 1/2O2 (g), Kc = ?
A) 1.2 x 10-7
B) 4.6 x 10-7
C) 4.8 x 10-4
D) 4.3 x 10-6
C) 4.8 x 10-4
Calculate the standard Gibbs free energy change at 298 K for the reaction, using the following table:
CO (g) = -137.2 kJ/mol
CO2 (g) = -394
Fe3O4 (s) = -1014
Fe3O4 (s) + 4CO (g) <-> 3Fe(s) + 4CO2 (g)
A) -757 kJ/mol
B) -14.8 kJ/mol
C) 14.8 kJ/mol
D) 757 kJ/mol
B) -14.8 kJ/mol
What is the free energy change for the formation of one mole of ammonia from its elements under standard conditions?
2NH3 (g) -> N2 (g) + 3H2 (g), ΔG = 33.0 kJ/mol
A) -66.0 kJ/mol
B) -33.0 kJ/mol
C) -16.5 kJ/mol
D) 66.0 kJ/mol
C) -16.5 kJ/mol
What is the name of Bruno Mars' upcoming February album?
The Romantic
A solution of NaCl in water has a concentration of 20.5% by mass. What is the molal concentration of the solution?
A) 0.205 m
B) 0.258 m
C) 3.51 m
D) 4.41 m
D) 4.41 m
Consider the reaction:
X2 (g) + 2Y (g) <-> 2Z (g).
12 moles of Z are placed in an evacuated 2.00 L flask. After the reactants and products reach equilibrium, the flask contains 6.00 moles of Y. What is the equilibrium constant, K, for the reaction?
A) 0.333
B) 0.667
C) 1.50
D) 3.00
B) 0.667
For this reaction at 25 degrees Celsius, ΔH = -1854 kJ/mol and ΔS = -236 J/mol*K.
CH3COCH3 (g) + 4O2 -> 3CO2 + 3H2O (l)
What is the value of ΔG for this reaction?
A) -1784 kJ/mol
B) -1848 kJ/mol
C) -1924 kJ/mol
D) 68500 kJ/mol
A) -1784 kJ/mol
For the reaction 1/2F2 (g) <-> F (g), a reaction mixture initially contains 0.5 atm of F2 and 0.5 atm of F (g) in their standard states. If Kp = 7.55 x 10-2 at this temperature, which statement is true?
A) Q < K, and the reaction proceeds towards the reactants.
B) Q < K, and the reaction proceeds towards the products.
C) Q = K, and the reaction is at equilibrium.
D) Q > K, and the reaction proceeds towards the reactants.
D) Q > K, and the reaction proceeds towards the reactants.
What was the name of Conan Gray's 2025 album?
Wishbone
When 100 g of an unknown compound was dissolved in 1 kg of water, the freezing point was lowered by 6.36 degrees Celsius. What is the identity of this unknown compound? (Kf for water = 1.86 C/m)
A) CsCl
B) KCl
C) LiF
D) NaCl
D) NaCl
Phosgene decomposes into carbon monoxide and elemental chlorine. If the initial concentration of COCl2 is 0.50 M, what is the equilibrium concentration of CO (g)?
COCl2 (g) <-> CO (g) + Cl2 (g) Kc = 6.6 x 10-8
A) 1.8 x 10-4
B) 9.1 x 10-5
C) 1.7 x 10-8
D) 6.6 x 10-8
A) 1.8 x 10-4
An equilibrium mixture of I2 (g), Cl2 (g), and ICl (g) at 298 K has partial pressures of 0.0100 atm, 0.0100 atm, and 0.0900 atm, respectively. What is ΔG at 298 K for the reaction:
I2 (g) + Cl2 (g) <-> 2ICl (g)
A) -16.9 kJ/mol
B) -10.9 kJ/mol
C) 10.9 kJ/mol
D) 16.9 kJ/mol
B) -10.9 kJ/mol
BrCl (g) is in equilibrium with Br2 (g) and Cl2 (g) at 25.0 degrees Celsius.
2BrCl (g) <-> Br2 (g) + Cl2 (g), Kp = 0.130
Initially, in a closed container at 25.0 degrees Celsius, BrCl (g) has a partial pressure of 0.400 atm and Br2 (g) and Cl2 (g) each have partial pressures of 0.800 atm. What is the partial pressure of BrCl (g) once the system reaches equilibrium?
A) 0.419 atm
B) 0.781 atm
C) 1.16 atm
D) 1.21 atm
C) 1.16 atm
What was the highest grossing animated movie released in 2025?
Ne Zha 2