AP Chemistry Unit 7 Review

C(s) + CO₂(g) ↔ 2CO(g)

A sealed, rigid container holds an equilibrium mixture of the system represented above.

Which of the following changes will increase the amount of CO(g) in the container?

• Increasing the temperature of the system

• Decreasing the volume of the container at constant temperature

• Adding a solid catalyst at constant temperature

• Removing some C(s) at constant temperature

Tags

NGSS.HS-PS1-5

X(g) + 2Q(g) ↔ 4Z(g) + R(g)

Equimolar samples of X(g) and Q(g) are pumped into an evacuated, rigid container and allowed to reach equilibrium according to the equation above.

Which of the following must be true at equilibrium?

• [X] must be less than [Q]

• [Q] must be less than [Z]

• [Z] must be greater than [R]

• [X] must be equal to [R]

Tags

NGSS.HS-PS1-7

PCl₅(g) ↔ PCl₃(g) + Cl₂(g)

K_P=210 at 700K

For the reaction system represented above, the initial partial pressures are;

P_PCl5=0.010atm

P_PCl3=1.5atm

P_Cl2=0.50atm

As the system approaches equilibrium at 700K, which of the following will occur and why?

• More PCl₅(g) will form because Q_P<K_P

• More PCl₅(g) will form because Q_P>K_P

• More PCl₃(g) and Cl₂(g) will form because Q_P<K_P

• More PCl₃(g) and Cl₂(g) will form because Q_P>K_P

2NOBr(g) ↔ 2NO(g) + Br₂(g)

A rigid reaction vessel contains NOBr(g) in equilibrium with NO(g) and Br₂(g) at 450K, as represented by the equation above. The partial pressures of the gases at equilibrium are shown in the table above.

Calculate the value of the equilibrium constant, K_P, for the reaction at 450K. Write your answer using two significant figures.

Tags

NGSS.HS-PS1-7

2Cr(s) + 3Fe²⁺(aq) ↔ 2Cr³⁺(aq) + 3Fe(s)

What is the expression for the equilibrium constant, K_C, for the reaction represented above?

• 
• 
• 
• 

Tags

NGSS.HS-PS1-2

Based on the information above, which of the following expressions corresponds to K_eq for the reaction represented below?

2BrCl(g) + I₂(g) ↔ 2IBr(g) + Cl₂(g)

• K₁K₂

• K₁/K₂

• K₂/K₁

• 1/K₁K₂

Based on the information in the table above, which of the following arranges the compounds in order of increasing molar solubility at 25^oC?

• CaSO₄ < PbSO₄ < BaSO₄

• BaSO₄ < PbSO₄ < CaSO₄

• CaSO₄ < BaSO₄ < PbSO₄

• PbSO₄ < CaSO₄ < BaSO₄

4NO₂(g) + O₂(g) ↔ 2N₂O₅(g)

At 325K, 2.00mol each of the three gases in the reaction represented above are placed in an evacuated, rigid 1.00L container. The value of K_C for the reaction at 325K is 4.57x10^-3.

At equilibrium, which of the gases will have the highest concentration?

• NO₂(g)

• O₂(g)

• N₂O₅(g)

• All three gases will have the same concentration at equilibrium