AP Chem Unit 07 Days 01-02 Practice

Write the general equilibrium constant for

2NaBr(aq) + Pb(ClO₄)₂(aq) ⇄ PbBr₂(s) + 2NaClO₄(aq)

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NO₂(g) + CO(g) ⇄ NO(g)+ CO₂(g) K = 1.2x10⁻⁷

Given the information above, how do the equilibrium concentrations of the reactants compare to the equilibrium concentrations of the products?

• They are much smaller.

• They are much bigger.

• They are approximately the same.

• They are identical.

Tags

NGSS.HS-PS1-7

NO₂(g) + CO(g) ⇄ NO(g)+ CO₂(g) K = 1.2x10⁷

Given the information above, how do the equilibrium concentrations of the reactants compare to the equilibrium concentrations of the products?

• They are much smaller.

• They are much bigger.

• They are approximately the same.

• They are identical.

Analyze the equilibrium mixture with its corresponding equation shown. Which K value correctly describes this mixture at equilibrium?

• K = 0

• K = 1

• K > 1

• K < 1

Tags

NGSS.HS-PS1-6

NGSS.HS-PS1-7

In which of the following cases will the LEAST time be required to arrive at equilibrium? The value of K below refers to the equilibrium constant.

• K is a very small number.

• K is a very large number.

• K is equal to 1.

• Cannot tell since the time to arrive at equilibrium does not depend on K.

In which of the following cases will the LEAST time be required to arrive at equilibrium?

Reaction I: A⇌B K = 4x10^-23

Reaction II: B⇌C K = 8x10^-2

Reaction III: C⇌D K = 5x10¹²

• Reaction I

• Reaction II

• Reaction III

• Cannot tell since the time to arrive at equilibrium does not depend on K.

The equilibrium

A(aq) + B(aq) ⇌ 2C(aq)

exists in a closed container at 273K. If the molar concentrations of A, B, and C at equilibrium are [A] = 2.00M, [B] = 0.50M and [C] = 6.00M, respectively, what is value of the equilibrium constant at 273K?

• 0.030

• 6.0

• 36

• 72

The value of the equilibrium constant for the reaction

H₂(g) + I₂(g) ⇌ 2HI(g)

is 4.0×10⁻⁴ at a specified temperature. What would be the value of that constant for the reverse reaction under these same conditions?

• 2.5×10⁴

• 2.5×10³

• 4.0×10⁻⁴

• −4.0×10⁻⁴

Given the information

2 X(g) + Y(g) ⇌ 2 Z(g) K_c = 100

Determine the value of the equilibrium constant, K_c , for the following reaction at the same temperature and pressure.

Z(g) ⇌ X(g) + ½Y(g) K_c = ??

• 0.1

• 0.01

• 10,000

• 10

Tags

NGSS.HS-PS1-6

NGSS.HS-PS1-7

Given the equilibria and equilibrium constants shown, the correct expression for K₃ in terms of K₁ and K₂ is

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Tags

NGSS.HS-PS1-7