13. Basic Chemistry: Chemical Equilibrium

13. Basic Chemistry: Chemical Equilibrium

University

25 Qs

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13. Basic Chemistry: Chemical Equilibrium

13. Basic Chemistry: Chemical Equilibrium

Assessment

Quiz

Chemistry

University

Practice Problem

Medium

Created by

Alina Primasari

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25 questions

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1.

MULTIPLE CHOICE QUESTION

10 mins • 1 pt

Calculate the equilibrium constant (Kc) for the given reaction and tell whether equilibrium lies to the left or the right. PCl5 (g) ↔ PCl3 (g) + Cl2 (g)

Equilibrium concentrations are: [PCl5] = 0.25 M, [PCl3] = 9.7 × 10-4 M, and [Cl2] = 3.2 × 10-3 M.

Kc = 2.5 × 10-3; equilibrium lies to the right.

Kc = 5.0 × 10-6; equilibrium lies to the right.

Kc = 3.2 × 10-2; equilibrium lies to the left.

Kc = 1.24 × 10-5; equilibrium lies to the left.

Kc = 1.0 × 10-4; equilibrium lies to the left.

2.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

What is the Kc expression for this reaction?
   2NO(g)  +  O2(g) ⇌  2NO2(g)

Kc = [NO2]2 / ([NO]2 x [O2])

Kc = [NO]2 x [O2] / [NO2]2

Kc = [NO2] / ([NO]2 x [O2])

Kc = [O2] / ([NO]2 x [NO2]2)

Kc = [NO]2 / ([NO2]2 x [O2])

3.

MULTIPLE CHOICE QUESTION

10 mins • 1 pt

When 0.40 mole of SO2 and 0.60 mole of O2 are placed in an evacuated 1.00–liter flask, the reaction represented below occurs.

2SO2 (g) + O2 (g) ↔ 2SO3 (g)

After the reactants and the product reach equilibrium and the initial temperature is restored, the flask is found to contain 0.30 mole of SO3. Based on these results, the equilibrium constant, Kc, for the reaction is ..................

20

1.5

30
10

2.5

4.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

H2(g) + Cl2(g) ⇌ 2HCl(g)

The forward reaction is exothermic. What will happen to the equilibrium if the temperature is increased?

The concentration of H2 will not change.

The equilibrium will shift to the right, favoring HCl.
The reaction will stop completely.

The equilibrium will shift to the left, favoring H2 and Cl2.

The equilibrium will remain unchanged.

5.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

What is the equilibrium expression (Kc) for this reaction?

Fe3O4(s) + 4H2(g) ⇌ 3Fe(s) + 4H2O(g)

Kc = [Fe][H2O]4  / [Fe3O4] [H2]4

Kc = [Fe3O4] [H2]/  [Fe][H2O]4

Kc = [H2]4 / [Fe]3

Kc = [Fe] [H2O] / [Fe3O4] [H2]

Kc = [H2O]4 / [H2]4

6.

MULTIPLE CHOICE QUESTION

5 mins • 1 pt

What are the two factors to look for when determining if the reaction is at equilibrium?

Constant concentrations and equal reaction rates.
Fluctuating concentrations and varying reaction rates.
Constant temperature and pressure changes.

Forward reaction rate is faster than the reverse and concentrations are equal

Increased volume and decreased pressure.

7.

MULTIPLE CHOICE QUESTION

3 mins • 1 pt

2SO2(g) + O2(g) ⇌ 2SO3(g)
Removing O2(g) will ............

shift the equilibrium to the left
shift the equilibrium to the right

produce more SO3

increase the concentration of SO2

decrease the temperature

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