Question 1

Biological reactions are catalyzed by

Accepted Answer

A) carbohydrates. 
B) enzymes. 
C) lipids. 
D) steroids. 
A) carbohydrates. 
B) enzymes. 
C) lipids. 
D) steroids.

Question 2

Which of the following figures represents the beta decay of  
To give  
After one half-life has passed? Unshaded spheres represent  
Atoms and shaded spheres represent  
Atoms.

Accepted Answer

A) figure (1) 
B) figure (2) 
C) figure (3) 
D) figure (4) 
A) figure (1) 
B) figure (2) 
C) figure (3) 
D) figure (4)

Question 3

If the units for rate are M s-1,what are the units for the rate constant,k,for a zeroth-order reaction?

Accepted Answer

A) s-1 
B) M-1 
C) M s-1 
D) M-1 s-1 
A) s-1 
B) M-1 
C) M s-1 
D) M-1 s-1

Question 4

For the reaction shown below,what is the order of reaction with respect to Br-?
ClO2-(aq)+ 4 Br-(aq)+ 4 H+(aq)→ Cl-(aq)+ 2 Br2(aq)+2 H2O(l)

Accepted Answer

A) 1st order 
B) 2nd order 
C) 4th order 
D) can't tell from the information provided 
A) 1st order 
B) 2nd order 
C) 4th order 
D) can't tell from the information provided

Question 5

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 6

The following reaction is first order in A and first order in B:
A + B → Products Rate = k[A][B]
What is the initial rate of this reaction in vessel (b)relative to the initial rate of this reaction in vessel (a)? Each vessel has the same volume.Shaded spheres represent A molecules,and unshaded spheres represent B molecules present at the beginning of the reaction.

Accepted Answer

A) rate in vessel (b)/rate in vessel (a)= 1:2 
B) rate in vessel (b)/rate in vessel (a)= 1:1 
C) rate in vessel (b)/rate in vessel (a)= 2:1 
D) rate in vessel (b)/rate in vessel (a)= 4:1 
A) rate in vessel (b)/rate in vessel (a)= 1:2 
B) rate in vessel (b)/rate in vessel (a)= 1:1 
C) rate in vessel (b)/rate in vessel (a)= 2:1 
D) rate in vessel (b)/rate in vessel (a)= 4:1

Question 7

Iodide and hypochlorite ion react in aqueous solution according to the reaction below:
I- + OCl- → OI- + Cl-
If the concentration of OH- in the solution is doubled,the rate of the reaction is halved.What is the order of the reaction with respect to OH-?

Accepted Answer

A) -2 
B) -1 
C) +1 
D) +2 
A) -2 
B) -1 
C) +1 
D) +2

Question 8

Shown is a concentration versus time plot for a reaction involving gases A,B,and C.  
-Over the time interval 300 to 400 seconds,the rate of reaction with respect to A is Δ[A]/Δt =
3)7 × 10-5 M/s.What is the rate of reaction with respect to A over the time interval 700 to 800 seconds?

Accepted Answer

A) 0 M/s 
B) less than 3.7 × 10-5 M/s 
C) 3)7 × 10-5 M/s 
D) greater than 3.7 × 10-5 M/s 
A) 0 M/s 
B) less than 3.7 × 10-5 M/s 
C) 3)7 × 10-5 M/s 
D) greater than 3.7 × 10-5 M/s

Question 9

The elementary reaction: 2 HI → H2 + I2,is an example of a ________ reaction.

Accepted Answer

A) unimolecular 
B) bimolecular 
C) termolecular 
D) tetramolecular 
A) unimolecular 
B) bimolecular 
C) termolecular 
D) tetramolecular

Question 10

A mechanism for a naturally occurring reaction that destroys ozone is:
Step 1: O3(g)+ HO(g)→ HO2(g)+ O2(g)
Step 2: HO2(g)+ O(g)→ HO(g)+ O2(g)
Which species is an intermediate?

Accepted Answer

A) HO 
B) HO2 
C) O 
D) O3 
A) HO 
B) HO2 
C) O 
D) O3

Question 11

Using the method of initial rates for the reaction A → B,if the initial concentration of A is doubled and the rate of reaction quadruples,what is the order of reaction with respect to A?

Accepted Answer

A) zeroth 
B) first 
C) second 
D) fourth 
A) zeroth 
B) first 
C) second 
D) fourth

Question 12

Consider a reaction that occurs by the following one-step mechanism:
AS1U1B12S1U1B0 + BS1U1B12S1U1B0 → 2 AB
The potential energy profile for this reaction is shown below.  
-What is the species present at reaction stage 2?

Accepted Answer

A) an intermediate 
B) a product 
C) a reactant 
D) a transition state 
A) an intermediate 
B) a product 
C) a reactant 
D) a transition state

Question 13

Nitrogen dioxide decomposes at 300°C via a second-order process to produce nitrogen monoxide and oxygen according to the following chemical equation.
2 NO2(g)→ 2 NO(g)+ O2(g).
A sample of NO2(g)is initially placed in a 2.50-L reaction vessel at 300°C.If the half-life and the rate constant at 300°C are 11 seconds and 0.54 M-1 s-1,respectively,how many moles of NO2 were in the original sample?

Accepted Answer

A) 0)17 mol 
B) 0)42 mol 
C) 5)9 mol 
D) 15 mol 
A) 0)17 mol 
B) 0)42 mol 
C) 5)9 mol 
D) 15 mol

Question 14

For the hypothetical second order reaction: A → products,the general rate law is: rate = k[A]2.How long is the third half-life of the reaction if [A]0 is 0.080 M and the first half-life is 22 minutes?

Accepted Answer

A) 0)57 min 
B) 1)7 min 
C) 7)3 min 
D) 88 min 
A) 0)57 min 
B) 1)7 min 
C) 7)3 min 
D) 88 min

Question 15

Shown is a concentration versus time plot for a reaction involving gases A,B,and C.  
-Over the time interval 300 to 400 seconds,the rate of reaction with respect to A is Δ[A]/Δt =
3)7 × 10-5 M/s.What is the rate of reaction with respect to A over the time interval 0 to 100 seconds?

Accepted Answer

A) 0 M/s 
B) less than 3.7 × 10-5 M/s 
C) 3)7 × 10-5 M/s 
D) greater than 3.7 × 10-5 M/s 
A) 0 M/s 
B) less than 3.7 × 10-5 M/s 
C) 3)7 × 10-5 M/s 
D) greater than 3.7 × 10-5 M/s

Question 16

Consider the first-order reaction A → B in which A molecules (unshaded spheres)are converted to B molecules (shaded spheres).Given the following pictures at t = 0 seconds and t = 100 seconds,which picture represents the number of A and B molecules remaining at 300 seconds?

Accepted Answer

A) picture a 
B) picture b 
C) picture c 
D) picture d 
A) picture a 
B) picture b 
C) picture c 
D) picture d

Question 17

At 55° the decomposition of N2O5 is first order,having a rate constant,k = 1.7 × 10-3 s-1.If the initial concentration of N2O5 is 6.4 × 10-3 M,the number of half-lives that are required for the N2O5 concentration to fall to 2.0 × 10-4 M is ________,and the amount of time required is ________ minutes.

Accepted Answer

Question 18

-Which of the elementary reactions shown above has a molecularity of three?

Accepted Answer

A) elementary reaction (a) 
B) elementary reaction (b) 
C) elementary reaction (c) 
D) elementary reactions (a),(b),and (c) 
A) elementary reaction (a) 
B) elementary reaction (b) 
C) elementary reaction (c) 
D) elementary reactions (a),(b),and (c)

Question 19

Fluorine-18 is a radioisotope widely used in positron emission tomography to investigate brain activity.The half-life is 109.8 minutes.How long will it take for 2.75 μg of 18F to decay to 500 ng?

Accepted Answer

A) 0)288 min 
B) 270 min 
C) 871 min 
D) 2)06 × 103 min 
A) 0)288 min 
B) 270 min 
C) 871 min 
D) 2)06 × 103 min

Question 20

At 300°C decomposition of NO2(g)occurs with a rate law: Rate = - k[NO2]x.If the initial rate of decomposition is 3.2 × 10-5 M/s when [NO2]o = 8.0 × 10-3 M and the initial rate of decomposition is 8.0 × 10-6 M/s when [NO2]o = 4.0 × 10-3 M,then the order of reaction with respect to NO2,x = ________.

Accepted Answer

Biological reactions are catalyzed by

Which of the following figures represents the beta decay of To give After one half-life has passed? Unshaded spheres represent Atoms and shaded spheres represent Atoms.

If the units for rate are M s^-1,what are the units for the rate constant,k,for a zeroth-order reaction?

For the reaction shown below,what is the order of reaction with respect to Br^-? ClO₂^-(aq)+ 4 Br^-(aq)+ 4 H⁺(aq)→ Cl^-(aq)+ 2 Br₂(aq)+2 H₂O(l)

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?

Iodide and hypochlorite ion react in aqueous solution according to the reaction below: I^- + OCl^- → OI^- + Cl^- If the concentration of OH^- in the solution is doubled,the rate of the reaction is halved.What is the order of the reaction with respect to OH^-?

Shown is a concentration versus time plot for a reaction involving gases A,B,and C. -Over the time interval 300 to 400 seconds,the rate of reaction with respect to A is Δ[A]/Δt = 3)7 × 10^-5 M/s.What is the rate of reaction with respect to A over the time interval 700 to 800 seconds?

The elementary reaction: 2 HI → H₂ + I₂,is an example of a ________ reaction.

A mechanism for a naturally occurring reaction that destroys ozone is: Step 1: O₃(g)+ HO(g)→ HO₂(g)+ O₂(g) Step 2: HO₂(g)+ O(g)→ HO(g)+ O₂(g) Which species is an intermediate?

Using the method of initial rates for the reaction A → B,if the initial concentration of A is doubled and the rate of reaction quadruples,what is the order of reaction with respect to A?

Consider a reaction that occurs by the following one-step mechanism: A₂ + B₂ → 2 AB The potential energy profile for this reaction is shown below. -What is the species present at reaction stage 2?

For the hypothetical second order reaction: A → products,the general rate law is: rate = k[A]².How long is the third half-life of the reaction if [A]₀ is 0.080 M and the first half-life is 22 minutes?

Shown is a concentration versus time plot for a reaction involving gases A,B,and C. -Over the time interval 300 to 400 seconds,the rate of reaction with respect to A is Δ[A]/Δt = 3)7 × 10^-5 M/s.What is the rate of reaction with respect to A over the time interval 0 to 100 seconds?

Consider the first-order reaction A → B in which A molecules (unshaded spheres)are converted to B molecules (shaded spheres).Given the following pictures at t = 0 seconds and t = 100 seconds,which picture represents the number of A and B molecules remaining at 300 seconds?

-Which of the elementary reactions shown above has a molecularity of three?

Fluorine-18 is a radioisotope widely used in positron emission tomography to investigate brain activity.The half-life is 109.8 minutes.How long will it take for 2.75 μg of ¹⁸F to decay to 500 ng?

Chemistry: Matter and Measurement

Atoms, molecules, and Ions

Formulas, equations, and Moles

Reactions in Aqueous Solutions

Periodicity and the Atomic Structure of Atoms

Ionic Bonds and Some Main-Group Chemistry

Covalent Bonds and Molecular Structure

Thermochemistry: Chemical Energy

Gases: Their Properties and Behavior

Liquids,solids,and Phase Changes

Solutions and Their Properties

Chemical Equilibrium

Aqueous Equilibria: Acids and Bases

Applications of Aqueous Equilibria

Thermodynamics: Entropy, free Energy, and Equilibrium

Electrochemistry

Hydrogen, oxygen, and Water

The Main-Group Elements

Transition Elements and Coordination Chemistry

Metals and Solid-State Materials

Nuclear Chemistry

Organic and Biological Chemistry

Filters

Exam 12: Chemical Kinetics

Biological reactions are catalyzed by

Which of the following figures represents the beta decay of To give After one half-life has passed? Unshaded spheres represent Atoms and shaded spheres represent Atoms.

If the units for rate are M s-1,what are the units for the rate constant,k,for a zeroth-order reaction?

For the reaction shown below,what is the order of reaction with respect to Br-? ClO2-(aq)+ 4 Br-(aq)+ 4 H+(aq)→ Cl-(aq)+ 2 Br2(aq)+2 H2O(l)

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?

Iodide and hypochlorite ion react in aqueous solution according to the reaction below: I- + OCl- → OI- + Cl- If the concentration of OH- in the solution is doubled,the rate of the reaction is halved.What is the order of the reaction with respect to OH-?

Shown is a concentration versus time plot for a reaction involving gases A,B,and C. -Over the time interval 300 to 400 seconds,the rate of reaction with respect to A is Δ[A]/Δt = 3)7 × 10-5 M/s.What is the rate of reaction with respect to A over the time interval 700 to 800 seconds?

The elementary reaction: 2 HI → H2 + I2,is an example of a ________ reaction.

A mechanism for a naturally occurring reaction that destroys ozone is: Step 1: O3(g)+ HO(g)→ HO2(g)+ O2(g) Step 2: HO2(g)+ O(g)→ HO(g)+ O2(g) Which species is an intermediate?

Using the method of initial rates for the reaction A → B,if the initial concentration of A is doubled and the rate of reaction quadruples,what is the order of reaction with respect to A?

Consider a reaction that occurs by the following one-step mechanism: A2 + B2 → 2 AB The potential energy profile for this reaction is shown below. -What is the species present at reaction stage 2?

For the hypothetical second order reaction: A → products,the general rate law is: rate = k[A]2.How long is the third half-life of the reaction if [A]0 is 0.080 M and the first half-life is 22 minutes?

Shown is a concentration versus time plot for a reaction involving gases A,B,and C. -Over the time interval 300 to 400 seconds,the rate of reaction with respect to A is Δ[A]/Δt = 3)7 × 10-5 M/s.What is the rate of reaction with respect to A over the time interval 0 to 100 seconds?

Consider the first-order reaction A → B in which A molecules (unshaded spheres)are converted to B molecules (shaded spheres).Given the following pictures at t = 0 seconds and t = 100 seconds,which picture represents the number of A and B molecules remaining at 300 seconds?

-Which of the elementary reactions shown above has a molecularity of three?

Fluorine-18 is a radioisotope widely used in positron emission tomography to investigate brain activity.The half-life is 109.8 minutes.How long will it take for 2.75 μg of 18F to decay to 500 ng?

Chemistry: Matter and Measurement

Atoms, molecules, and Ions

Formulas, equations, and Moles

Reactions in Aqueous Solutions

Periodicity and the Atomic Structure of Atoms

Ionic Bonds and Some Main-Group Chemistry

Covalent Bonds and Molecular Structure

Thermochemistry: Chemical Energy

Gases: Their Properties and Behavior

Liquids,solids,and Phase Changes

Solutions and Their Properties

Chemical Equilibrium

Aqueous Equilibria: Acids and Bases

Applications of Aqueous Equilibria

Thermodynamics: Entropy, free Energy, and Equilibrium

Electrochemistry

Hydrogen, oxygen, and Water

The Main-Group Elements

Transition Elements and Coordination Chemistry

Metals and Solid-State Materials

Nuclear Chemistry

Organic and Biological Chemistry

Filters

If the units for rate are M s^-1,what are the units for the rate constant,k,for a zeroth-order reaction?

For the reaction shown below,what is the order of reaction with respect to Br^-? ClO₂^-(aq)+ 4 Br^-(aq)+ 4 H⁺(aq)→ Cl^-(aq)+ 2 Br₂(aq)+2 H₂O(l)

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?

Iodide and hypochlorite ion react in aqueous solution according to the reaction below: I^- + OCl^- → OI^- + Cl^- If the concentration of OH^- in the solution is doubled,the rate of the reaction is halved.What is the order of the reaction with respect to OH^-?

Shown is a concentration versus time plot for a reaction involving gases A,B,and C. -Over the time interval 300 to 400 seconds,the rate of reaction with respect to A is Δ[A]/Δt = 3)7 × 10^-5 M/s.What is the rate of reaction with respect to A over the time interval 700 to 800 seconds?

The elementary reaction: 2 HI → H₂ + I₂,is an example of a ________ reaction.

A mechanism for a naturally occurring reaction that destroys ozone is: Step 1: O₃(g)+ HO(g)→ HO₂(g)+ O₂(g) Step 2: HO₂(g)+ O(g)→ HO(g)+ O₂(g) Which species is an intermediate?

Consider a reaction that occurs by the following one-step mechanism: A₂ + B₂ → 2 AB The potential energy profile for this reaction is shown below. -What is the species present at reaction stage 2?

For the hypothetical second order reaction: A → products,the general rate law is: rate = k[A]².How long is the third half-life of the reaction if [A]₀ is 0.080 M and the first half-life is 22 minutes?

Shown is a concentration versus time plot for a reaction involving gases A,B,and C. -Over the time interval 300 to 400 seconds,the rate of reaction with respect to A is Δ[A]/Δt = 3)7 × 10^-5 M/s.What is the rate of reaction with respect to A over the time interval 0 to 100 seconds?

Fluorine-18 is a radioisotope widely used in positron emission tomography to investigate brain activity.The half-life is 109.8 minutes.How long will it take for 2.75 μg of ¹⁸F to decay to 500 ng?