Question 1

A rate is equal to 0.0200 M/s.If [A] = 0.100 M and rate = k[A]2,what is the new rate if the concentration of [A] is increased to 0.200 M?

Accepted Answer

A)  0.0200 M/s 
B)  0.0400 M/s 
C)  0.0600 M/s 
D)  0.0800 M/s 
E)  0.100 M/s 
A)  0.0200 M/s 
B)  0.0400 M/s 
C)  0.0600 M/s 
D)  0.0800 M/s 
E)  0.100 M/s

Question 2

A particular first-order reaction has a rate constant of 1.35 × 102 s-1 at 25.0°C.What is the magnitude of k at 75.0°C if Ea = 85.6 kJ/mol?

Accepted Answer

A)  3.47 × 104 s-1 
B)  1.92 × 104 s-1 
C)  670 s-1 
D)  3.85 × 106 s-1 
E)  1.36 × 102 s-1 
A)  3.47 × 104 s-1 
B)  1.92 × 104 s-1 
C)  670 s-1 
D)  3.85 × 106 s-1 
E)  1.36 × 102 s-1

Question 3

The decomposition of dinitrogen pentoxide is described by the following chemical equation 2 N2O5(g)→ 4 NO2(g)+ O2(g)
If the rate of appearance of NO2 is equal to 0.560 mol/min at a particular moment,what is the rate of appearance of O2 at that moment?

Accepted Answer

A)  0.140 mol/min 
B)  0.280 mol/min 
C)  1.12 mol/min 
D)  2.24 mol/min 
A)  0.140 mol/min 
B)  0.280 mol/min 
C)  1.12 mol/min 
D)  2.24 mol/min

Question 4

Given the following balanced equation,determine the rate of reaction with respect to [O2].If the rate of O2 loss is 2.64 × 10-3 M/s,what is the rate of formation of SO3? 2 SO2(g)+ O2(g)→ 2 SO3(g)

Accepted Answer

A)  2.64 × 10-3 M/s 
B)  1.19 × 10-3 M/s 
C)  1.32 × 10-3 M/s 
D)  6.60 × 10-2 M/s 
E)  5.28 × 10-3 M/s 
A)  2.64 × 10-3 M/s 
B)  1.19 × 10-3 M/s 
C)  1.32 × 10-3 M/s 
D)  6.60 × 10-2 M/s 
E)  5.28 × 10-3 M/s

Question 5

The aquation of tris(1,10-phenanthroline)iron(II)in acid solution takes place according to the following chemical equation: Fe(phen)32+ + 3 H3O+ + 3 H2O → Fe(H2O)62+ + 3 phenH+
If the activation energy,Ea,is 126 kJ/mol and the rate constant at 30°C is 9.8 × 10-3 min-1,what is the rate constant at 35°C?

Accepted Answer

A)  4.4 × 10-3 min-1 
B)  2.2 × 10-2 min-1 
C)  4.5 × 101 min-1 
D)  2.3 × 102 min-1 
A)  4.4 × 10-3 min-1 
B)  2.2 × 10-2 min-1 
C)  4.5 × 101 min-1 
D)  2.3 × 102 min-1

Question 6

The rate of disappearance of HBr in the gas phase reaction 2 HBr(g)→ H2(g)+ Br2(g)
Is 0.130 M s-1 at 150°C.The rate of reaction is ________ M s-1.

Accepted Answer

A)  3.85 
B)  0.0650 
C)  0.0169 
D)  0.260 
E)  0.0860 
A)  3.85 
B)  0.0650 
C)  0.0169 
D)  0.260 
E)  0.0860

Question 7

Given the following balanced equation,determine the rate of reaction with respect to [NH3]. N2(g)+ 3 H2(g)→ 2 NH3(g)

Accepted Answer

A)  Rate = +   
B)  Rate = -   
C)  Rate = +  
  
D)  Rate = -  
  
E)  It is not possible to determine without more information. 
A)  Rate = +   
B)  Rate = -   
C)  Rate = +  
  
D)  Rate = -  
  
E)  It is not possible to determine without more information.

Question 8

In the hydrogenation of double bonds,a catalyst is needed.In the third step,the reactants react to form the product.This step is known as

Accepted Answer

A)  adsorption. 
B)  diffusion. 
C)  reaction. 
D)  desorption. 
E)  none of the above 
A)  adsorption. 
B)  diffusion. 
C)  reaction. 
D)  desorption. 
E)  none of the above

Question 9

The reaction that occurs in a Breathalyzer,a device used to determine the alcohol level in a person's bloodstream,is given below.If the rate of appearance of Cr2(SO4)3 is 1.64 mol/min at a particular moment,what is the rate of disappearance of C2H6O at that moment? 2 K2Cr2O7 + 8 H2SO4 + 3 C2H6O → 2 Cr2(SO4)3 + 2 K2SO4 + 11 H2O

Accepted Answer

A)  0.547 mol/min 
B)  1.09 mol/min 
C)  2.46 mol/min 
D)  4.92 mol/min 
A)  0.547 mol/min 
B)  1.09 mol/min 
C)  2.46 mol/min 
D)  4.92 mol/min

Question 10

Identify an homogeneous catalyst.

Accepted Answer

A)  SO2 over vanadium (V) oxide 
B)  Pd in H2 gas 
C)  Pd with methane 
D)  H2SO4 with concentrated HCl 
E)  H2 catalyzed by Zn 
A)  SO2 over vanadium (V) oxide 
B)  Pd in H2 gas 
C)  Pd with methane 
D)  H2SO4 with concentrated HCl 
E)  H2 catalyzed by Zn

Question 11

The isomerization reaction,CH3NC → CH3CN,is first order and the rate constant is equal to 0.46 s-1 at 600 K.What is the concentration of CH3NC after 0.20 minutes if the initial concentration is 0.30 M?

Accepted Answer

A)  1.2 × 10-3 M 
B)  2.7 × 10-3 M 
C)  1.2 × 10-1 M 
D)  2.7 × 10-1 M 
A)  1.2 × 10-3 M 
B)  2.7 × 10-3 M 
C)  1.2 × 10-1 M 
D)  2.7 × 10-1 M

Question 12

Given the following balanced equation,determine the rate of reaction with respect to [O2].If the rate of formation of O2 is 7.78 × 10-1 M/s,what is the rate of the loss of O3? 2 O3(g)→ 3 O2(g)

Accepted Answer

A)  0.519 M/s 
B)  1.56 M/s 
C)  2.34 M/s 
D)  1.17 M/s 
E)  7.78 M/s 
A)  0.519 M/s 
B)  1.56 M/s 
C)  2.34 M/s 
D)  1.17 M/s 
E)  7.78 M/s

Question 13

Carbon-14 has a half-life of 5720 years and this is a first-order reaction.If a piece of wood has converted 25% of the carbon-14,then how old is it?

Accepted Answer

A)  11440 years 
B)  2375 years 
C)  4750 years 
D)  4290 years 
E)  1430 years 
A)  11440 years 
B)  2375 years 
C)  4750 years 
D)  4290 years 
E)  1430 years

Question 14

Identify the CFC with the longest atmospheric lifetime.

Accepted Answer

A)  CFC-113 
B)  CFC-12 
C)  CFC-114 
D)  CFC-11 
E)  CFC-115 
A)  CFC-113 
B)  CFC-12 
C)  CFC-114 
D)  CFC-11 
E)  CFC-115

Question 15

Is the activation energy for a forward reaction the same as the activation energy for the reverse of the same reaction? Use a sketch of a reaction energy diagram.

Accepted Answer

The relationship between the activation

Question 16

Given the following rate law,how does the rate of reaction change if the concentration of X is doubled? Rate = k[X]2[Y]3

Accepted Answer

A)  The rate of reaction will decrease by a factor of 6. 
B)  The rate of reaction will increase by a factor of 3. 
C)  the rate of reaction will increase by a factor of 2. 
D)  The rate of reaction will increase by a factor of 4. 
E)  The rate of reaction will remain unchanged. 
A)  The rate of reaction will decrease by a factor of 6. 
B)  The rate of reaction will increase by a factor of 3. 
C)  the rate of reaction will increase by a factor of 2. 
D)  The rate of reaction will increase by a factor of 4. 
E)  The rate of reaction will remain unchanged.

Question 17

The rate constant,k,for a first-order reaction is equal to 4.2 × 10-4 s-1.What is the half-life for the reaction?

Accepted Answer

A)  2.9 × 10-4 s 
B)  1.2 × 103 s 
C)  1.7 × 103 s 
D)  2.4 × 103 s 
A)  2.9 × 10-4 s 
B)  1.2 × 103 s 
C)  1.7 × 103 s 
D)  2.4 × 103 s

Question 18

SO2Cl2 decomposes in the gas phase by the reaction SO2Cl2(g)→ SO2(g)+ Cl2(g)
The reaction is first order in SO2Cl2 and the rate constant is 3.0 × 10-6 s-1 at 600 K.A vessel is charged with 2.4 atm of SO2Cl2 at 600 K.The partial pressure of SO2Cl2 at 3.0 × 105 s is ________ atm.

Accepted Answer

A)  0.76 
B)  2.2 
C)  0.98 
D)  0.29 
E)  1.4 × 105 
A)  0.76 
B)  2.2 
C)  0.98 
D)  0.29 
E)  1.4 × 105

Question 19

The rate of disappearance of HBr in the gas phase reaction 2 HBr(g)→ H2(g)+ Br2(g)
Is 0.301 M s-1 at 150°C.The rate of appearance of Br2 is ________ M s-1.

Accepted Answer

A)  1.66 
B)  0.151 
C)  0.0906 
D)  0.602 
E)  0.549 
A)  1.66 
B)  0.151 
C)  0.0906 
D)  0.602 
E)  0.549

Question 20

The second-order decomposition of NO2 has a rate constant of 0.255 M-1s-1.How much NO2 decomposes in 4.00 s if the initial concentration of NO2 (1.00 L volume)is 1.33 M?

Accepted Answer

A)  1.8 mol 
B)  0.85 mol 
C)  0.48 mol 
D)  0.77 mol 
E)  0.56 mol 
A)  1.8 mol 
B)  0.85 mol 
C)  0.48 mol 
D)  0.77 mol 
E)  0.56 mol

Exam 14: Chemical Kinetics

A rate is equal to 0.0200 M/s.If [A] = 0.100 M and rate = k[A]2,what is the new rate if the concentration of [A] is increased to 0.200 M?

A particular first-order reaction has a rate constant of 1.35 × 102 s-1 at 25.0°C.What is the magnitude of k at 75.0°C if Ea = 85.6 kJ/mol?

The decomposition of dinitrogen pentoxide is described by the following chemical equation 2 N2O5(g)→ 4 NO2(g)+ O2(g) If the rate of appearance of NO2 is equal to 0.560 mol/min at a particular moment,what is the rate of appearance of O2 at that moment?

Given the following balanced equation,determine the rate of reaction with respect to [O2].If the rate of O2 loss is 2.64 × 10-3 M/s,what is the rate of formation of SO3? 2 SO2(g)+ O2(g)→ 2 SO3(g)

The rate of disappearance of HBr in the gas phase reaction 2 HBr(g)→ H2(g)+ Br2(g) Is 0.130 M s-1 at 150°C.The rate of reaction is ________ M s-1.

Given the following balanced equation,determine the rate of reaction with respect to [NH3]. N2(g)+ 3 H2(g)→ 2 NH3(g)

In the hydrogenation of double bonds,a catalyst is needed.In the third step,the reactants react to form the product.This step is known as

Identify an homogeneous catalyst.

The isomerization reaction,CH3NC → CH3CN,is first order and the rate constant is equal to 0.46 s-1 at 600 K.What is the concentration of CH3NC after 0.20 minutes if the initial concentration is 0.30 M?

Given the following balanced equation,determine the rate of reaction with respect to [O2].If the rate of formation of O2 is 7.78 × 10-1 M/s,what is the rate of the loss of O3? 2 O3(g)→ 3 O2(g)

Carbon-14 has a half-life of 5720 years and this is a first-order reaction.If a piece of wood has converted 25% of the carbon-14,then how old is it?

Identify the CFC with the longest atmospheric lifetime.

Is the activation energy for a forward reaction the same as the activation energy for the reverse of the same reaction? Use a sketch of a reaction energy diagram.

Given the following rate law,how does the rate of reaction change if the concentration of X is doubled? Rate = k[X]2[Y]3

The rate constant,k,for a first-order reaction is equal to 4.2 × 10-4 s-1.What is the half-life for the reaction?

SO2Cl2 decomposes in the gas phase by the reaction SO2Cl2(g)→ SO2(g)+ Cl2(g) The reaction is first order in SO2Cl2 and the rate constant is 3.0 × 10-6 s-1 at 600 K.A vessel is charged with 2.4 atm of SO2Cl2 at 600 K.The partial pressure of SO2Cl2 at 3.0 × 105 s is ________ atm.

The rate of disappearance of HBr in the gas phase reaction 2 HBr(g)→ H2(g)+ Br2(g) Is 0.301 M s-1 at 150°C.The rate of appearance of Br2 is ________ M s-1.

The second-order decomposition of NO2 has a rate constant of 0.255 M-1s-1.How much NO2 decomposes in 4.00 s if the initial concentration of NO2 (1.00 L volume)is 1.33 M?

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A rate is equal to 0.0200 M/s.If [A] = 0.100 M and rate = k[A]²,what is the new rate if the concentration of [A] is increased to 0.200 M?

A particular first-order reaction has a rate constant of 1.35 × 10² s^-1 at 25.0°C.What is the magnitude of k at 75.0°C if E_a = 85.6 kJ/mol?

The decomposition of dinitrogen pentoxide is described by the following chemical equation 2 N₂O₅(g)→ 4 NO₂(g)+ O₂(g) If the rate of appearance of NO₂ is equal to 0.560 mol/min at a particular moment,what is the rate of appearance of O₂ at that moment?

Given the following balanced equation,determine the rate of reaction with respect to [O₂].If the rate of O₂ loss is 2.64 × 10^-3 M/s,what is the rate of formation of SO₃? 2 SO₂(g)+ O₂(g)→ 2 SO₃(g)

The rate of disappearance of HBr in the gas phase reaction 2 HBr(g)→ H₂(g)+ Br₂(g) Is 0.130 M s^-1 at 150°C.The rate of reaction is ________ M s^-1.

Given the following balanced equation,determine the rate of reaction with respect to [NH₃]. N₂(g)+ 3 H₂(g)→ 2 NH₃(g)

The isomerization reaction,CH₃NC → CH₃CN,is first order and the rate constant is equal to 0.46 s^-1 at 600 K.What is the concentration of CH₃NC after 0.20 minutes if the initial concentration is 0.30 M?

Given the following balanced equation,determine the rate of reaction with respect to [O₂].If the rate of formation of O₂ is 7.78 × 10^-1 M/s,what is the rate of the loss of O₃? 2 O₃(g)→ 3 O₂(g)

Given the following rate law,how does the rate of reaction change if the concentration of X is doubled? Rate = k[X]²[Y]³

The rate constant,k,for a first-order reaction is equal to 4.2 × 10^-4 s^-1.What is the half-life for the reaction?

The rate of disappearance of HBr in the gas phase reaction 2 HBr(g)→ H₂(g)+ Br₂(g) Is 0.301 M s^-1 at 150°C.The rate of appearance of Br₂ is ________ M s^-1.

The second-order decomposition of NO₂ has a rate constant of 0.255 M^-1s^-1.How much NO₂ decomposes in 4.00 s if the initial concentration of NO₂ (1.00 L volume)is 1.33 M?