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Dawn G
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Chapter 13- Chemical Equilibrium

Questão 1 de 35

1

At equilibrium, __________.

Selecione uma das seguintes:

  • A) all chemical reactions have ceased

  • B) the rates of the forward and reverse reactions are equal

  • C) the rate constants of the forward and reverse reactions are equal

  • D) the value of the equilibrium constant is 1

  • E) the limiting reagent has been consumed

Explicação

Questão 2 de 35

1

Which one of the following will change the value of an equilibrium constant?

Selecione uma das seguintes:

  • A) changing temperature

  • B) adding other substances that do not react with any of the species involved in the equilibrium

  • C) varying the initial concentrations of reactants

  • D) varying the initial concentrations of products

  • E) changing the volume of the reaction vessel

Explicação

Questão 3 de 35

1

The equilibrium-constant expression depends on the __________ of the reaction.

Selecione uma das seguintes:

  • A) stoichiometry

  • B) mechanism

  • C) stoichiometry and mechanism

  • D) the quantities of reactants and products initially present

  • E) temperature

Explicação

Questão 4 de 35

1

The equilibrium constant for reaction 1 is K. The equilibrium constant for reaction 2 is __________.

(1) SO2 (g) + (1/2) O2 (g) --> SO3 (g)
(2) 2SO3 (g) --> 2SO2 (g) + O2 (g)

Selecione uma das seguintes:

  • A) K2

  • B) 2K

  • C) 1/2K

  • D) 1/K2

  • E) -K2

Explicação

Questão 5 de 35

1

The value of Keq for the following reaction is 0.25:

SO2 (g) + NO2 (g) ---> SO3 (g) + NO (g)

The value of Keq at the same temperature for the reaction below is __________.

2SO2 (g) + 2NO2 (g) ---> 2SO3 (g) + 2NO (g)

Selecione uma das seguintes:

  • A) 0.50

  • B) 0.063

  • C) 0.12

  • D) 0.25

  • E) 16

Explicação

Questão 6 de 35

1

The Keq for the equilibrium below is 7.52 × 10-2 at 480.0°C.

2Cl2 (g) + 2H2O (g) --> 4HCl (g) + O2 (g)

What is the value of Keq at this temperature for the following reaction?

4HCl (g) + O2 (g) --> 2Cl2 (g) + 2H2O (g)

Selecione uma das seguintes:

  • A) 0.0752

  • B) -0.0752

  • C) 13.3

  • D) 5.66 × 10-3

  • E) 0.150

Explicação

Questão 7 de 35

1

Given the following reaction at equilibrium, if Kc = 1.90 × 1019 at 25.0°C, Kp = __________.

H2 (g) + Br2 (g) ---> 2 HBr (g)

Selecione uma das seguintes:

  • A) 5.26 × 10-20

  • B) 1.56 × 104

  • C) 6.44 × 105

  • D) 1.90 × 1019

  • E) none of the above

Explicação

Questão 8 de 35

1

The equilibrium constant for the gas phase reaction

N2 (g) + 3H2 (g) --> 2NH3 (g)

is Keq = 4.34 × 10-3 at 300°C. At equilibrium, __________.

Selecione uma das seguintes:

  • A) products predominate

  • B) reactants predominate

  • C) roughly equal amounts of products and reactants are present

  • D) only products are present

  • E) only reactants are present

Explicação

Questão 9 de 35

1

The equilibrium constant for the gas phase reaction

2SO2 (g) + O2 (g) --> 2SO3 (g)

is Keq = 2.80 × 102 at 999 K. At equilibrium, __________.

Selecione uma das seguintes:

  • A) products predominate

  • B) reactants predominate

  • C) roughly equal amounts of products and reactants are present

  • D) only products are present

  • E) only reactants are present

Explicação

Questão 10 de 35

1

Consider the following equilibrium.

2SO2 (g) + O2 (g) --> 2SO3 (g)

The equilibrium cannot be established when __________ is/are placed in a 1.0-L container.

Selecione uma das seguintes:

  • A) 0.25 mol SO2 (g) and 0.25 mol O2 (g)

  • B) 0.75 mol SO2 (g)

  • C) 0.25 mol of SO2 (g) and 0.25 mol of SO3 (g)

  • D) 0.50 mol O2 (g) and 0.50 mol SO3 (g)

  • E) 1.0 mol SO3 (g)

Explicação

Questão 11 de 35

1

At 400 K, the equilibrium constant for the reaction

Br2 (g) + Cl2 (g) --> 2BrCl (g)

is Kp = 7.0. A closed vessel at 400 K is charged with 1.00 atm of Br2 (g), 1.00 atm of Cl2 (g), and 2.00 atm of BrCl (g). Use Q to determine which of the statements below is true.

Selecione uma das seguintes:

  • A) The equilibrium partial pressures of Br2, Cl2, and BrCl will be the same as the initial values.

  • B) The equilibrium partial pressure of Br2 will be greater than 1.00 atm.

  • C) At equilibrium, the total pressure in the vessel will be less than the initial total pressure.

  • D) The equilibrium partial pressure of BrCl (g) will be greater than 2.00 atm.

  • E) The reaction will go to completion since there are equal amounts of Br2 and Cl2.

Explicação

Questão 12 de 35

1

How is the reaction quotient used to determine whether a system is at equilibrium?

Selecione uma das seguintes:

  • A) The reaction quotient must be satisfied for equilibrium to be achieved.

  • B) At equilibrium, the reaction quotient is undefined.

  • D) The reaction is at equilibrium when Q > Keq.

  • E) The reaction is at equilibrium when Q = Keq.

Explicação

Questão 13 de 35

1

Of the following equilibria, only __________ will shift to the right in response to a decrease in volume.

Selecione uma das seguintes:

  • A) H2 (g) + Cl2 (g) ---> 2 HCl (g)

  • B) 2 SO3 (g) ---> 2 SO2 (g) + O2 (g)

  • C) N2 (g) + 3 H2 (g) ---> 2 NH3 (g)

  • D) 2 Fe2O3 (s) ---> 4 Fe (s) + 3 O2 (g)

  • E) 2HI (g) ---> H2 (g) + I2 (g)

Explicação

Questão 14 de 35

1

The reaction below is exothermic:

2SO2 (g) + O2 (g) ---> 2SO3 (g)

Le Châtelier's Principle predicts that __________ will result in an increase in the number of moles of SO3 (g) in the reaction container.

Selecione uma das seguintes:

  • A) increasing the pressure

  • B) decreasing the pressure

  • C) increasing the temperature

  • D) removing some oxygen

  • E) increasing the volume of the container

Explicação

Questão 15 de 35

1

For the endothermic reaction

CaCO3 (s) --> CaO (s) + CO2 (g)

Le Châtelier's principle predicts that __________ will result in an increase in the number of moles of CO2.

Selecione uma das seguintes:

  • A) increasing the temperature

  • B) decreasing the temperature

  • C) increasing the pressure

  • D) removing some of the CaCO3 (s)

  • E) none of the above

Explicação

Questão 16 de 35

1

In which of the following reactions would increasing pressure at constant temperature not change the concentrations of reactants and products, based on Le Châtelier's principle?

Selecione uma das seguintes:

  • A) N2 (g) + 3H2 (g) 2NH3 (g)

  • B) N2O4 (g) 2NO2 (g)

  • C) N2 (g) + 2O2 (g) 2NO2 (g)

  • D) 2N2 (g) + O2 (g) 2N2O (g)

  • E) N2 (g) + O2 (g) 2NO (g)

Explicação

Questão 17 de 35

1

Consider the following reaction at equilibrium:

2NH3 (g) ---> N2 (g) + 3H2 (g) ΔH° = +92.4 kJ

Le Châtelier's principle predicts that adding N2 (g) to the system at equilibrium will result in __________.

Selecione uma das seguintes:

  • A) a decrease in the concentration of NH3 (g)

  • B) a decrease in the concentration of H2 (g)

  • C) an increase in the value of the equilibrium constant

  • D) a lower partial pressure of N2

  • E) removal of all of the H2 (g)

Explicação

Questão 18 de 35

1

Consider the following reaction at equilibrium:

2NH3 (g) ----> N2 (g) + 3H2 (g)

Le Châtelier's principle predicts that the moles of H2 in the reaction container will increase with __________.

Selecione uma das seguintes:

  • A) some removal of NH3 from the reaction vessel (V and T constant)

  • B) a decrease in the total pressure (T constant)

  • C) addition of some N2 to the reaction vessel (V and T constant)

  • D) a decrease in the total volume of the reaction vessel (T constant)

  • E) an increase in total pressure by the addition of helium gas (V and T constant)

Explicação

Questão 19 de 35

1

Consider the following reaction at equilibrium:

2CO2 (g) ---> 2CO (g) + O2 (g) ΔH° = -514 kJ

Le Châtelier's principle predicts that adding O2 (g) to the reaction container will __________.

Selecione uma das seguintes:

  • A) increase the partial pressure of CO (g) at equilibrium

  • B) decrease the partial pressure of CO2 (g) at equilibrium

  • C) increase the value of the equilibrium constant

  • D) increase the partial pressure of CO2 (g) at equilibrium

  • E) decrease the value of the equilibrium constant

Explicação

Questão 20 de 35

1

Consider the following reaction at equilibrium:

2CO2 (g) ----> 2CO (g) + O2 (g) ΔH° = -514 kJ

Le Châtelier's principle predicts that an increase in temperature will __________.

Selecione uma das seguintes:

  • A) increase the partial pressure of O2 (g)

  • B) decrease the partial pressure of CO2 (g)

  • C) decrease the value of the equilibrium constant

  • D) increase the value of the equilibrium constant

  • E) increase the partial pressure of CO

Explicação

Questão 21 de 35

1

Consider the following reaction at equilibrium:

C (s) + H2O (g) ----> CO (g) + H2 (g)

Which of the following conditions will increase the partial pressure of CO?

Selecione uma das seguintes:

  • A) decreasing the partial pressure of H2O (g)

  • B) removing H2O (g) from the system

  • C) decreasing the volume of the reaction vessel

  • D) decreasing the pressure in the reaction vessel

  • E) increasing the amount of carbon in the system

Explicação

Questão 22 de 35

1

Consider the following reaction at equilibrium.

2CO2 (g) ---> 2CO (g) + O2 (g) ΔH° = -514 kJ

Le Châtelier's principle predicts that the equilibrium partial pressure of CO (g) can be maximized by carrying out the reaction __________.

Selecione uma das seguintes:

  • A) at high temperature and high pressure

  • B) at high temperature and low pressure

  • C) at low temperature and low pressure

  • D) at low temperature and high pressure

  • E) in the presence of solid carbon

Explicação

Questão 23 de 35

1

Consider the following reaction at equilibrium:

2SO2 (g) + O2 (g) --> 2SO3 (g) ΔH° = -99 kJ

Le Châtelier's principle predicts that an increase in temperature will result in __________.

Selecione uma das seguintes:

  • A) a decrease in the partial pressure of SO3

  • B) a decrease in the partial pressure of SO2

  • C) an increase in Keq

  • D) no changes in equilibrium partial pressures

  • E) the partial pressure of O2 will decrease

Explicação

Questão 24 de 35

1

The effect of a catalyst on an equilibrium is to __________.

Selecione uma das seguintes:

  • A) increase the rate of the forward reaction only

  • B) increase the equilibrium constant so that products are favored

  • C) slow the reverse reaction only

  • D) increase the rate at which equilibrium is achieved without changing the composition of the equilibrium mixture

  • E) shift the equilibrium to the right

Explicação

Questão 25 de 35

1

The value of Keq for the equilibrium

H2 (g) + I2 (g) ---> 2 HI (g)

is 794 at 25 °C. What is the value of Keq for the equilibrium below?
1/2 H2 (g) + 1/2 I2 (g) ---> HI (g)

Selecione uma das seguintes:

  • A) 397

  • B) 0.035

  • C) 28

  • D) 1588

  • E) 0.0013

Explicação

Questão 26 de 35

1

The value of Keq for the equilibrium

H2 (g) + I2 (g) ---> 2 HI (g)

is 794 at 25°C. At this temperature, what is the value of Keq for the equilibrium below?

HI (g) ---> 1/2 H2 (g) + 1/2 I2 (g)

Selecione uma das seguintes:

  • A) 1588

  • B) 28

  • C) 397

  • D) 0.035

  • E) 0.0013

Explicação

Questão 27 de 35

1

Given the following reaction:

CO (g) + 2H2(g) ---> CH3OH (g)

In an experiment, 0.42 mol of CO and 0.42 mol of H2 were placed in a 1.00-L reaction vessel. At equilibrium, there were 0.29 mol of CO remaining. Keq at the temperature of the experiment is __________.

Selecione uma das seguintes:

  • A) 2.80

  • B) 0.357

  • C) 14.5

  • D) 17.5

  • E) none of the above

Explicação

Questão 28 de 35

1

At 200°C, the equilibrium constant (Kp) for the reaction below is 2.40 × 103.

2NO (g) ---> N2 (g) + O2 (g)

A closed vessel is charged with 36.1 atm of NO. At equilibrium, the partial pressure of O2 is __________ atm.

Selecione uma das seguintes:

  • A) 294

  • B) 35.7

  • C) 17.9

  • D) 6.00

  • E) 1.50 × 10-2

Explicação

Questão 29 de 35

1

Given the following reaction at equilibrium, if Kc = 6.34 x 105 at 230.0°C, Kp = __________.

2NO (g) + O2 (g) ---> 2NO2 (g)

Selecione uma das seguintes:

  • A) 3.67 × 10-2

  • B) 1.53 × 104

  • C) 6.44 × 105

  • D) 2.61 × 106

  • E) 2.62 × 107

Explicação

Questão 30 de 35

1

Nitrosyl bromide decomposes according to the following equation.

2NOBr (g) ---> 2NO (g) + Br2 (g)

A sample of NOBr (0.64 mol) was placed in a 1.00-L flask containing no NO or Br2. At equilibrium the flask contained 0.36 mol of NOBr. How many moles of NO and Br2, respectively, are in the flask at equilibrium?

Selecione uma das seguintes:

  • A) .28,.28

  • B) .36,.18

  • C) .28,.14

  • D) .14,.23

  • E) .36,.36

Explicação

Questão 31 de 35

1

If the value for the equilibrium constant is much greater than 1, then the equilibrium mixture contains mostly __________.

Selecione uma das seguintes:

  • A) Reactants

  • B) Products

  • C) Neither, they are in equal amounts

Explicação

Questão 32 de 35

1

The number obtained by substituting starting reactant and product concentrations into an equilibrium-constant expression is known as the __________.

Selecione uma das seguintes:

  • A) Rate Constant

  • B) Reaction Quotient

  • C) Equilibrium Concentration

  • D) Reaction Rate

Explicação

Questão 33 de 35

1

The relationship between the concentrations of reactants and products of a system at equilibrium is given by the law of mass action.

Selecione uma das seguintes:

  • True

  • False

Explicação

Questão 34 de 35

1

If a reaction is endothermic, __________ the reaction temperature results in an increase in K.

Selecione uma das seguintes:

  • A) Increasing

  • B) Decreasing

  • C) Constant

Explicação

Questão 35 de 35

1

For an exothermic reaction, increasing the reaction temperature results in a(an) __________ in K.

Selecione uma das seguintes:

  • A) Increasing

  • B) Decreasing

  • C) Constant

Explicação

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