Practice Exam 2: CHEM 1120 General Chemistry II – Review Questions &
Answers (2026)
e) It can be changed by changing the temperature. - ANS ✔✔Which of the following statements
is true about the value of the equilibrium constant (Kc) for a reaction?
a) It can be increased by the addition of a catalyst.
b) It can be increased by increasing the concentration of a product.
c) It can be increased by decreasing the concentration of a reactant.
d) It can always be increased by increasing the volume of a system.
e) It can be changed by changing the temperature.
e) The concentration of HCl will increase as the system approaches equilibrium. - ANS ✔✔For
the reaction
2HCl(g) ⇌ H₂(g) + Cl₂(g),
Kc = 0.290 at 400 K. If 1.50x10⁻³ M of HCl, H₂, and Cl₂ are mixed initially at 400 K, which one of
the following will happen?
a) The concentration of HCl and Cl₂ will increase as the system approaches equilibrium.
b) The concentration of H₂ and Cl₂ will increase as the system approaches equilibrium.
c) The system is at equilibrium.
d) The concentration of H₂ and HCl will decrease as the system approaches equilibrium.
e) The concentration of HCl will increase as the system approaches equilibrium.
, b) The reactants will predominate. - ANS ✔✔The value of the equilibrium constant (Kc) for the
reaction
N₂(g) + 3H₂(g) ⇌ 2NH₃(g)
is 4.34x10⁻³ at 300°C. Which of the following statements will be true regarding the system at
equilibrium?
a) The products will predominate.
b) The reactants will predominate.
c) Only reactants will be present.
d) Only products will be present.
e) Roughly equal amounts of products and reactants will be present.
a) 342.25 - ANS ✔✔A 3.80 mol sample of HI is placed in a 1.00 L vessel at 460°C, which is
allowed to undergo decomposition according to the equation
2HI(g) ⇌ H₂(g) + I₂(g).
At equilibrium, there is 1.85 mol of I₂(g) present in the flask. What is the value of the
equilibrium constant (Kc) for the reaction at 460°C?
a) 342.25
b) 0.24
c) 18.50
d) 34.23
e) 4.22
Answers (2026)
e) It can be changed by changing the temperature. - ANS ✔✔Which of the following statements
is true about the value of the equilibrium constant (Kc) for a reaction?
a) It can be increased by the addition of a catalyst.
b) It can be increased by increasing the concentration of a product.
c) It can be increased by decreasing the concentration of a reactant.
d) It can always be increased by increasing the volume of a system.
e) It can be changed by changing the temperature.
e) The concentration of HCl will increase as the system approaches equilibrium. - ANS ✔✔For
the reaction
2HCl(g) ⇌ H₂(g) + Cl₂(g),
Kc = 0.290 at 400 K. If 1.50x10⁻³ M of HCl, H₂, and Cl₂ are mixed initially at 400 K, which one of
the following will happen?
a) The concentration of HCl and Cl₂ will increase as the system approaches equilibrium.
b) The concentration of H₂ and Cl₂ will increase as the system approaches equilibrium.
c) The system is at equilibrium.
d) The concentration of H₂ and HCl will decrease as the system approaches equilibrium.
e) The concentration of HCl will increase as the system approaches equilibrium.
, b) The reactants will predominate. - ANS ✔✔The value of the equilibrium constant (Kc) for the
reaction
N₂(g) + 3H₂(g) ⇌ 2NH₃(g)
is 4.34x10⁻³ at 300°C. Which of the following statements will be true regarding the system at
equilibrium?
a) The products will predominate.
b) The reactants will predominate.
c) Only reactants will be present.
d) Only products will be present.
e) Roughly equal amounts of products and reactants will be present.
a) 342.25 - ANS ✔✔A 3.80 mol sample of HI is placed in a 1.00 L vessel at 460°C, which is
allowed to undergo decomposition according to the equation
2HI(g) ⇌ H₂(g) + I₂(g).
At equilibrium, there is 1.85 mol of I₂(g) present in the flask. What is the value of the
equilibrium constant (Kc) for the reaction at 460°C?
a) 342.25
b) 0.24
c) 18.50
d) 34.23
e) 4.22
