Deck 15: Chemical Equilibrium
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Deck 15: Chemical Equilibrium
1
At equilibrium, the forward reaction rate is greater than the reverse reaction rate.
False
2
Identify the equilibrium constant expression for the following reaction:
A)
B)
C)
D)
E)
A)
B)
C)
D)
E)
3
Identify the expression for for the reaction . 
A)
B)
C)
D)
E)

A)
B)
C)
D)
E)
4
The equilibrium constant of a reaction at 320 is 9.60 . At the same temperature, the equilibrium constant for the reverse reaction will be _____.
A) 0.000
B) 9.22
C) 4.80
D) 1.04
E) 9.06
A) 0.000
B) 9.22
C) 4.80
D) 1.04
E) 9.06
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5
Kp = K only if the moles of gaseous products and gaseous reactants are different.
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6
Calculate Kp for the reaction at a temperature of 439 , if K = 5.10 × 104 at the same temperature.
A) 1.90 ×102
B) 8.72 ×102
C) 1.40×103
D) 0.60 ×103
E) 6.50 ×102
A) 1.90 ×102
B) 8.72 ×102
C) 1.40×103
D) 0.60 ×103
E) 6.50 ×102
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7
The unit of equilibrium constant is mol/L.
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8
Define chemical equilibrium.
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9
_____ constants are calculated using effective concentrations, or activities, of reactants and products.
A) Formation
B) Planck's
C) Dielectric
D) Faraday's
E) Equilibrium
A) Formation
B) Planck's
C) Dielectric
D) Faraday's
E) Equilibrium
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10
Values of equilibrium constant (K) greater than 103 indicate a strong tendency for reactants to form products.
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11
_____ is the point at which the forward and reverse reaction rates become the same so that the net composition of the system no longer changes with time.
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12
The equilibrium constant for a reaction written in reverse is the same as that written originally.
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13
Which of the following is the expression to calculate the equilibrium constant for partial pressures?
A)
B)
C)
D)
E)
A)
B)
C)
D)
E)
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14
Chemical _____ is a dynamic process that consists of a forward reaction, in which reactants are converted to products, and a reverse reaction, in which products are converted to reactants.
A) transition
B) change
C) equilibrium
D) bonding
E) transmutation
A) transition
B) change
C) equilibrium
D) bonding
E) transmutation
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15
_____ are the ratios of the measured concentrations to a standard state of 1 M.
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16
What does the law of mass action state?
A) The lowest-energy electron configuration for an atom is the one that has the maximum number of electrons with parallel spins in degenerate orbitals.
B) For the general balanced chemical equation , the equilibrium constant expression is
.
C) No two electrons in an atom can have the same value of all four quantum numbers.
D) The energy of the universe is constant: ? Euniverse = ? Esystem + ? Esurroundings = 0.
E) The entropy of the universe remains constant in a reversible process, whereas the entropy of the universe increases in an irreversible process.
A) The lowest-energy electron configuration for an atom is the one that has the maximum number of electrons with parallel spins in degenerate orbitals.
B) For the general balanced chemical equation , the equilibrium constant expression is
.
C) No two electrons in an atom can have the same value of all four quantum numbers.
D) The energy of the universe is constant: ? Euniverse = ? Esystem + ? Esurroundings = 0.
E) The entropy of the universe remains constant in a reversible process, whereas the entropy of the universe increases in an irreversible process.
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17
Explain the relationship between the equilibrium constant and the rate constants for the forward and reverse reactions with an example.
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18
The composition of an equilibrium mixture is dependent on the direction from which equilibrium is approached.
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19
Calculate the equilibrium constant K3 for the reaction at 785 . Given that the equilibrium constant K1 for the reaction is 7.34 and the equilibrium constant K2 for the reaction is 2.89 .
A) 2.53
B) 7.34
C) 2.89
D) 4.45
E) 2.12
A) 2.53
B) 7.34
C) 2.89
D) 4.45
E) 2.12
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20
In the reaction , values of the equilibrium constant at various temperatures were found to be ,
and . At what temperature would the proportion of A and B in the equilibrium mixture be the highest?
A) 206
B) 256
C) 150
D) 110
E) 160

A) 206
B) 256
C) 150
D) 110
E) 160
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21
If the system is at equilibrium.
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22
Explain the Le Châtelier's Principle.
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23
Explain the method to calculate an equilibrium constant from equilibrium concentrations with an example.
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24
A system whose reactants, products, or both are in more than one phase is a _____ equilibrium.
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25
Calculate Kp for the reaction . Given that the mixture of H2 and I2 was maintained at 740 K until the system reached equilibrium, and the equilibrium mixture contained 3.68 × 10?2 M HI, 8.31 × 10?3 M H2, and 7.72 × 10?4 M I2.
A) 3.68 × 10?2
B) 2.11 × 102
C) 5.73 × 103
D) 1.74 × 10?4
E) 8.31 × 10?3
A) 3.68 × 10?2
B) 2.11 × 102
C) 5.73 × 103
D) 1.74 × 10?4
E) 8.31 × 10?3
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26
A large _____ constant implies that the reactants are converted almost entirely to products.
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27
If K > Q, then the ratio of the concentrations of products to the concentrations of reactants is greater than at equilibrium.
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28
The equilibrium constant K for the reaction is 0.213 at 640 K. A mixture of gases that initially contains 0.0260 M H2 and 0.0260 M CO2 is allowed to equilibrate at 700 K. Calculate the final concentration of CO2.
A) 1.779 × 10-2
B) 8.203 × 10-3
C) 0.213 × 10-2
D) 0.026 × 10-3
E) 0.052 × 10-2
A) 1.779 × 10-2
B) 8.203 × 10-3
C) 0.213 × 10-2
D) 0.026 × 10-3
E) 0.052 × 10-2
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29
The Le Châtelier's principle states that if stress is applied to a system at equilibrium, the composition of the system remains unchanged.
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30
Which of the following statements is true about Q and K?
A) If Q < K, then the ratio of the concentrations of products to the concentrations of reactants is more than the ratio at equilibrium.
B) If Q = K, then the system is at equilibrium.
C) if Q > K, then the ratio of the concentrations of products to the concentrations of reactants is less than at equilibrium.
D) If Q < K, then products are formed at the expense of the reactants.
E) If Q < K, then reactants are formed at the expense of products.
A) If Q < K, then the ratio of the concentrations of products to the concentrations of reactants is more than the ratio at equilibrium.
B) If Q = K, then the system is at equilibrium.
C) if Q > K, then the ratio of the concentrations of products to the concentrations of reactants is less than at equilibrium.
D) If Q < K, then products are formed at the expense of the reactants.
E) If Q < K, then reactants are formed at the expense of products.
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31
A small equilibrium constant implies that the reactants are converted almost entirely to products.
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32
_____ are responsible for the scents associated with fruits such as oranges and bananas.
A) Crown ethers
B) Amalgams
C) Cryptands
D) Esters
E) Catalysts
A) Crown ethers
B) Amalgams
C) Cryptands
D) Esters
E) Catalysts
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33
For the following reaction , at 30 . If = 0.56 atm and = 0.18 atm, what will be the partial pressure of C in equilibrium with A and B at 1 atm?
A) 0.18
B) 0.56
C) 6.7
D)
E) 1.3
A) 0.18
B) 0.56
C) 6.7
D)
E) 1.3
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34
Which of the following denotes the reaction quotient Q?
A)
B)
C)
D)
E)
A)
B)
C)
D)
E)
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35
Given that at equilibrium =0.072 M and =0.089 M at 40 , calculate the equilibrium constant from the equilibrium concentrations for the reaction .
A)
B)
C)
D)
E)
A)
B)
C)
D)
E)
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36
Define reaction quotient
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37
_____ occurs when any change in a system affects the magnitude of Q or K.
A) Suspension
B) Activity
C) Stress
D) Cracking
E) Reforming
A) Suspension
B) Activity
C) Stress
D) Cracking
E) Reforming
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38
Which of the following statements refer to the LeChâtelier's Principle?
A) If a stress is applied to a system at equilibrium, the composition of the system will change to relieve the applied stress.
B) The uncertainty in the position of a particle multiplied by the uncertainty in its momentum is greater than or equal to Planck's constant divided by 4π.
C) The energy of electromagnetic radiation is directly proportional to its frequency and inversely proportional to its wavelength.
D) No two electrons in an atom can have the same value of all four quantum numbers.
E) Matter and energy have properties typical of both waves and particles.
A) If a stress is applied to a system at equilibrium, the composition of the system will change to relieve the applied stress.
B) The uncertainty in the position of a particle multiplied by the uncertainty in its momentum is greater than or equal to Planck's constant divided by 4π.
C) The energy of electromagnetic radiation is directly proportional to its frequency and inversely proportional to its wavelength.
D) No two electrons in an atom can have the same value of all four quantum numbers.
E) Matter and energy have properties typical of both waves and particles.
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39
In the reaction ,the concentration of H2(g) will _____ when the concentration of HBr is decreased by a factor of 4.
A) increase by about a factor 2
B) decrease by about a factor 4
C) remain unchanged
D) decrease by about a factor 2
E) increase by about a factor 4
A) increase by about a factor 2
B) decrease by about a factor 4
C) remain unchanged
D) decrease by about a factor 2
E) increase by about a factor 4
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40
A 1.00 mol sample of A was placed in a 2.00 L reactor and heated to 342 until the system reached equilibrium. The contents of the reactor then contained 0.0488 mol of C. What is K for the reaction 2A(g) 2B(g) +C(g) at the same temperature?
A) 1.45
B) 4.37
C) 2.64
D) 2.85
E) 3.59
A) 1.45
B) 4.37
C) 2.64
D) 2.85
E) 3.59
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41
If Q > K, then the ratio of the concentrations of products to the concentrations of reactants is _____ than at equilibrium.
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42
Explain the effect of the changes in temperature on the equilibrium of the system.
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43
Explain the effect of changes in total pressure or volume on the equilibrium of the system.
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44
The concentration of any gaseous reactant or product is inversely proportional to the applied pressure (P).
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45
What would be the reaction quotient for the reaction if the pressure is decreased by a factor of 2 at constant temperature?
A)
B)
C)
D)
E)
A)
B)
C)
D)
E)
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46
If a balanced chemical equation contains different numbers of gaseous reactant and product molecules, the _____ will be sensitive to changes in volume or pressure.
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47
Which of the following statements is true about the effect of changes in temperature on the equilibrium of the system?
A) Increasing the temperature will shift the exothermic reaction to the right.
B) Increasing the temperature decreases the magnitude of the equilibrium constant for an endothermic reaction.
C) Increasing the temperature increases the equilibrium constant for an exothermic reaction.
D) Increasing the temperature has no effect on the equilibrium constant for a thermally neutral reaction. HYPERLINK "http://catalog.flatworldknowledge.com/bookhub/reader/4309?e=averill_1.0-ch08" \l "averill_1.0-ch15_s05_s03_t01"
E) Increasing the temperature will shift the endothermic reaction to the left.
A) Increasing the temperature will shift the exothermic reaction to the right.
B) Increasing the temperature decreases the magnitude of the equilibrium constant for an endothermic reaction.
C) Increasing the temperature increases the equilibrium constant for an exothermic reaction.
D) Increasing the temperature has no effect on the equilibrium constant for a thermally neutral reaction. HYPERLINK "http://catalog.flatworldknowledge.com/bookhub/reader/4309?e=averill_1.0-ch08" \l "averill_1.0-ch15_s05_s03_t01"
E) Increasing the temperature will shift the endothermic reaction to the left.
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48
In all reactions, if a _____ is applied to a system at equilibrium, the composition of the system will change to counteract the applied stress.
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49
Which of the following statements is true about the effect of changes in total pressure or volume on the equilibrium of a system?
A) The concentration of any gaseous reactant or product is directly proportional to the total volume and inversely proportional to the applied pressure.
B) The change in pressure above a liquid solution has little effect on the concentrations of dissolved substances.
C) The concentrations of gases remain constant with pressure.
D) The equilibrium compositions of systems that contain gaseous substances are insensitive to changes in pressure and volume.
E) The change in external pressure has a tremendous effect on an equilibrium system that contains only solids or liquids.
A) The concentration of any gaseous reactant or product is directly proportional to the total volume and inversely proportional to the applied pressure.
B) The change in pressure above a liquid solution has little effect on the concentrations of dissolved substances.
C) The concentrations of gases remain constant with pressure.
D) The equilibrium compositions of systems that contain gaseous substances are insensitive to changes in pressure and volume.
E) The change in external pressure has a tremendous effect on an equilibrium system that contains only solids or liquids.
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50
What would be the effect of adding carbon dioxide on in the reaction, ?
A) remains constant
B) increases
C) becomes zero
D) becomes insignificant
E) decreases
A) remains constant
B) increases
C) becomes zero
D) becomes insignificant
E) decreases
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51
Which of the following signifies the relationship between the concentration of a gas and its pressure?
A)
B)
C)
D)
E)
A)
B)
C)
D)
E)
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52
Changing the pressure above a liquid solution has a drastic effect on the concentrations of dissolved substances.
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53
A reaction with an unfavorable equilibrium constant can be driven to completion by continually removing one of the _____ of the reaction.
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54
_____ states that if a stress is applied to a system at equilibrium, the composition of the system will adjust to counteract the stress.
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55
The equilibrium compositions of systems that contain _____ substances are quite sensitive to changes in pressure, volume, and temperature.
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56
The _____ has the same form as the equilibrium constant expression, but it is derived from concentrations obtained at any time.
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57
Increasing the pressure of a system favors the side of the reaction that has fewer gaseous molecules.
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58
A reaction can be forced to go essentially to completion, regardless of the magnitude of K, by continually removing one of the products from the reaction mixture.
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59
What would be the effect of decreasing the temperature for the reaction given that ?
A) Equilibrium shifts to the left
B) There is no effect on the reaction
C) Formation of C is favored
D) Decomposition of C is favored
E) C remains constant
A) Equilibrium shifts to the left
B) There is no effect on the reaction
C) Formation of C is favored
D) Decomposition of C is favored
E) C remains constant
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60
How can a reaction with an unfavorable equilibrium constant be driven to completion?
A) By continually removing one of the products of the reaction
B) By keeping the temperature of the system constant
C) By keeping the pressure of the system constant
D) By continually removing one of the reactants of the reaction
E) By maintaining equal concentration of the reactants
A) By continually removing one of the products of the reaction
B) By keeping the temperature of the system constant
C) By keeping the pressure of the system constant
D) By continually removing one of the reactants of the reaction
E) By maintaining equal concentration of the reactants
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61
Removing heat from an _____ reaction favors the formation of products.
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62
Explain the Sohio acrylonitrile process.
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63
_____ control consists of adjusting conditions so that at equilibrium only the desired products are present in significant quantities.
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64
Differentiate between kinetic and thermodynamic control.
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65
Identify the following kinetically controlled reaction:
A) The Haber-Bosch process
B) The Ostwald process
C) The water-gas shift reaction
D) The contact process
E) The Sohio acrylonitrile process
A) The Haber-Bosch process
B) The Ostwald process
C) The water-gas shift reaction
D) The contact process
E) The Sohio acrylonitrile process
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66
_____ is the building block of the polymer called polyacrylonitrile.
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67
The altering of reaction conditions so that a single desired product or set of products is present in significant quantities at equilibrium is known as _____ control.
A) potential
B) ionic
C) electrostatic
D) kinetic
E) thermodynamic
A) potential
B) ionic
C) electrostatic
D) kinetic
E) thermodynamic
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68
Which of the following is the thermodynamic controlled reaction that produces ammonia?
A) The contact process
B) The Haber-Bosch process
C) The Ostwald process
D) The water-gas shift reaction
E) The Sohio acrylonitrile process
A) The contact process
B) The Haber-Bosch process
C) The Ostwald process
D) The water-gas shift reaction
E) The Sohio acrylonitrile process
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69
CH2=CHC≡N(g) is the product formed in the Haber-Bosch process.
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70
Which of the following is the kinetically controlled reaction that produces ?
A) The Sohio acrylonitrile process
B) The contact process
C) The water-gas shift reaction
D) The Haber-Bosch process
E) The Ostwald process
A) The Sohio acrylonitrile process
B) The contact process
C) The water-gas shift reaction
D) The Haber-Bosch process
E) The Ostwald process
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71
The altering of reaction conditions to control reaction rates, thereby obtaining a single desired product or set of products is known as _____ control.
A) thermodynamic
B) potential
C) electrostatic
D) kinetic
E) ionic
A) thermodynamic
B) potential
C) electrostatic
D) kinetic
E) ionic
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72
The Sohio acrylonitrile process involves the reaction of nitrogen and hydrogen to form ammonia.
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73
The industrial Haber-Bosch process uses Fe2O3/K2O as the mixed oxide catalyst to enable the reaction to proceed at a significant rate at temperatures of 400°C-530°C.
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