Quiz Level M Equilibrium

Question 1

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Part 1

Choose the correct answers to complete the following.

a. Equilibrium can exist only when all particles are kept in a(n) Choose...sealedopened container and certain conditions are kept Choose...constantvariable .

b. A dynamic equilibrium is reached when the forward and backward reactions occur at Choose...different ratesthe same rate .

c. The macroscopic properties of a system at equilibrium are Choose...constantvariable .

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Consider the following reaction.

Choose the correct answers.

a. When the temperature of this reaction is increased, the equilibrium concentration of Cl2 will Choose...decreaseremain constantincrease .

b. When the equilibrium concentration of O2 is increased, the equilibrium concentration of Cl2 will Choose...decreaseremain constantincrease . 

c. When a catalyst is added to the system, the equilibrium concentration of Cl2 will Choose...decreaseremain constantincrease

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Consider the following reaction.

Choose the correct answer to complete the sentence below.

If the equilibrium concentration of Cl2 is increased, the equilibrium concentration of COCl2 will Choose...remain constantdecreaseincrease .

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Consider the following reaction.

The total pressure is increased by injecting helium gas into the chamber. Which of the following is true about the reaction?

Select one:

A. The equilibrium [HI], [H2] and [Cl2] are not affected.

B. The equilibrium concentration of [H2] and [I2] will decrease.

C. The equilibrium [HI] and [H2] will increase.

D. The equilibrium [HI] will increase.

E. The equilibrium [HI] and [Cl2] will decrease.

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Consider the following reaction.

The partial pressure of H2 is decreased.

Which of the following is true about the reaction?

Select one or more:

A. The equilibrium concentration of [O2] will increase.

B. The equilibrium [H2O], [H2] and [O2] are not affected.

C. The equilibrium [H2O] will decrease.

D. The equilibrium [H2O] and [O2] will increase.

E. The equilibrium [H2O] and [O2] will decrease.

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Which of the following affect the equilibrium of a reaction? Select all that apply.

Select one or more:

A. changing the concentration of the reactants or products

B. addition of an inert gas

C. changing the temperature

D. addition of a catalyst

Question 7

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Few drops Fe(NO3)3 are added to a solution containing KSCN and water.

Consider the following reaction.

What would happen if few crystals of Na2HPO4 are added to the mixture at equilibrium?

[Hint: The red color of the mixture is due to the hydrated thiocyanoiron(III) ion, FeSCN2+.]

Select one or more:

A. [Fe3+] will decrease.

B. [Fe3+] will increase.

C. The red color intensifies.

D. The red color diminishes.

E. [Fe3+] will not be affected.

Question 8

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Match each of the following systems to identify them as open or closed.

a. a Bunsen burner flame: Choose...closed systemopen system

b. a sealed bottle of sparkling water: Choose...closed systemopen system

c. a cup of soda: Choose...closed systemopen system

Question 9

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Consider the following reaction.

Choose the correct answer to complete the sentence below.

When the temperature is decreased, the equilibrium Choose...shifts to the rightshifts to the leftis not affected . The equilibrium [N2O4] Choose...increasesdecreasesremains constant . 

Part 2

Consider the following reactions.

Knowing that reaction A occurs to the greatest extent; however, reaction B occurs to the least extent.

Match each of the following reactions to their appropriate Keq.

1. A: Choose...1.0 × 10⁻¹⁶ at 25°C1.7 × 10⁷ at 25°C1.8 × 10⁻⁵ at 25°C

2. B: Choose...1.0 × 10⁻¹⁶ at 25°C1.7 × 10⁷ at 25°C1.8 × 10⁻⁵ at 25°C

3. C: Choose...1.0 × 10⁻¹⁶ at 25°C1.7 × 10⁷ at 25°C1.8 × 10⁻⁵ at 25°C

Question 2

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Hydrogen and nitrogen react to form ammonia as shown in the following chemical equation.

Values of the equilibrium constant at various temperatures are given below.

Keq (at 298 K) = 3 × 108

Keq  (at 450 K) = 3 × 103

Keq  (at 600 K) = 4.1 

At which temperature the system will contain the highest proportion of hydrogen and nitrogen in the equilibrium mixture?

Answer K

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The following reaction is the reaction of synthesis of ammonia at 500°C.

The equilibrium concentrations of the species present are recorded as follows.

[N2] = 1.50 × 10−5 M; [H2] = 3.54 × 10−1 M; [NH3] = 2.00 × 10−4 M

Calculate the value of the equilibrium constant, Keq at 500°C of the above reaction.

Give your answer to three significant figures.

K = Answer

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Choose the correct answers.

The equilibrium tends to move in the direction of the Choose...greatest lowest potential energy and the Choose...greatest lowest randomness.

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Given the following reaction.

Choose the correct answer to predict the position of the equilibrium under the following conditions.

a. The concentrations of the gases are:

[N2] = 0.04 M; [O2] = 0.1 M; [NO] = 0.2 M

The system is Choose...shifting to the rightat equilibriumshifting to the left .

b. The concentrations of the gases are:

[N2] = 0.4 M; [O2] = 0.1 M; [NO] = 0.005 M

The system is Choose...shifting to the rightat equilibriumshifting to the left .

c. The concentrations of the gases are:

[N2] = 0.04 M; [O2] = 0.1 M; [NO] = 0.002 M

The system is Choose...shifting to the rightat equilibriumshifting to the left .

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The equilibrium constant, Keq, of the following reaction is 5.0 at a certain temperature.

The same number of moles of each of I2 and Cl2, was injected into a 2.0 L container. The equilibrium concentration of ICl is found to be 0.10 M.

a. Calculate the concentration of Cl2 and I2 at equilibrium.

Give your answers to two significant figures.

[I2] = Answer M

[Cl2] = Answer M

b. Find the initial concentration of Cl2 and I2.

Give your answer to two significant figures.

[I2] = Answer M

[Cl2] = Answer M

c. Find the initial number of moles of Cl2 and I2.

n of I2 = Answer mol

n of Cl2 = Answer mol

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Which of the following is the law of equilibrium of the reaction below?

Select one:

A.

B.

C.

D.

E.

Question 8

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Which of the following are true about the reaction below? Select all that apply.

Select one or more:

A.

B.

C.

D.

E.

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Choose the correct answer to identify whether the reactants or the products have the greatest randomness.

	Choose...reactantsproducts
	Choose...reactantsproducts
	Choose...reactantsproducts

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Which of the following is the law of equilibrium for the reaction below?

Select one:

A.

B.

C.

D.

E.

Drag and drop from the box below to complete the following.

a. Equilibrium can exist only when all particles are kept in a(n)  blank  container and certain conditions are kept  blank .

b. A dynamic equilibrium is reached when the forward and backward reactions occur at  blank .

c. The macroscopic properties of a system at equilibrium are  blank 

SEALED - OPEN - CONSTANT - DIFFERENT RATES - THE SAME RATE -VARIABLE

The correct answer is:

a. Equilibrium can exist only when all particles are kept in a(n) [sealed ] container and certain conditions are kept [constant].

b. A dynamic equilibrium is reached when the forward and backward reactions occur at [the same rate].

c. The macroscopic properties of a system at equilibrium are [constant].

Consider the following reaction.

Drag and drop to complete the following.

a. When the temperature of this reaction is increased, the equilibrium concentration of Cl2 will  blank .

b. When the equilibrium concentration of O2 is increased, the equilibrium concentration of Cl2 will  blank . 

c. When a catalyst is added to the system, the equilibrium concentration of Cl2 will  blank .

The correct answer is:

Consider the following reaction.

a. When the temperature of this reaction is increased, the equilibrium concentration of Cl2 will [decrease].

b. When the equilibrium concentration of O2 is increased, the equilibrium concentration of Cl2 will [increase]. 

c. When a catalyst is added to the system, the equilibrium concentration of Cl2 will [remain constant].

Consider the following reaction.

Choose the correct answer to complete the sentence below.

If the equilibrium concentration of Cl2 is increased, the equilibrium concentration of COCl2 will increase or decrease .

Feedback

The correct answer is:

Consider the following reaction.

Choose the correct answer to complete the sentence below.

If the equilibrium concentration of Cl2 is increased, the equilibrium concentration of COCl2 will [increase].

Consider the following reaction.

The total pressure is increased by injecting helium gas into the chamber. Which of the following is true about the reaction?

Select one:

A. The equilibrium [HI] will increase.

B. The equilibrium [HI] and [Cl2] will decrease.

C. The equilibrium [HI], [H2] and [Cl2] are not affected. 

D. The equilibrium [HI] and [H2] will increase.

E. The equilibrium concentration of [H2] and [I2] will decrease.

Feedback

The correct answer is: The equilibrium [HI], [H2] and [Cl2] are not affected.

Consider the following reaction.

The partial pressure of H2 is decreased.

Which of the following is true about the reaction?

Select one or more:

A. The equilibrium [H2O], [H2] and [O2] are not affected.

B. The equilibrium [H2O] and [O2] will increase.

C. The equilibrium [H2O] will decrease. 

D. The equilibrium [H2O] and [O2] will decrease.

E. The equilibrium concentration of [O2] will increase. 

Feedback

The correct answers are: The equilibrium [H2O] will decrease., The equilibrium concentration of [O2] will increase.

Which of the following affect the equilibrium of a reaction? Select all that apply.

Select one or more:

A. changing the temperature 

B. addition of an inert gas

C. changing the concentration of the reactants or products 

D. addition of a catalyst

Feedback

The correct answers are: changing the temperature, changing the concentration of the reactants or products

Few drops Fe(NO3)3 are added to a solution containing KSCN and water.

Consider the following reaction.

What would happen if few crystals of Na2HPO4 are added to the mixture at equilibrium?

[Hint: The red color of the mixture is due to the hydrated thiocyanoiron(III) ion, FeSCN2+.]

Select one or more:

A. [Fe3+] will not be affected.

B. [Fe3+] will increase.

C. The red color intensifies.

D. The red color diminishes. 

E. [Fe3+] will decrease. 

Feedback

The correct answers are: [Fe3+] will decrease., The red color diminishes.

Match each of the following systems to identify them as open or closed.

a. a Bunsen burner flame: Choose...closed systemopen system 

b. a sealed bottle of sparkling water: Choose...closed systemopen system 

c. a cup of soda: Choose...closed systemopen system 

Feedback

The correct answer is:

Match each of the following systems to identify them as open or closed.

a. a Bunsen burner flame: [open system]

b. a sealed bottle of sparkling water: [closed system]

c. a cup of soda: [open system]

Consider the following reaction.

Choose the correct answer to complete the sentence below.

When the temperature is decreased, the equilibrium Choose...shifts to the rightshifts to the leftis not affected . The equilibrium [N2O4] Choose...increasesdecreasesremains constant . 

The correct answer is:

Consider the following reaction.

Choose the correct answer to complete the sentence below.

When the temperature is decreased, the equilibrium [shifts to the left]. The equilibrium [N2O4] [increases].