Question 1

Which of the following statements is false?

Accepted Answer

A) The rate determining step is always the slowest step in a multistep mechanism. 
B) The rate constant always changes with a variation in temperature. 
C) The energy of activation controls the speed of reaction. 
D) The rate of a reaction is independent of the concentration of reactants. 
A) The rate determining step is always the slowest step in a multistep mechanism. 
B) The rate constant always changes with a variation in temperature. 
C) The energy of activation controls the speed of reaction. 
D) The rate of a reaction is independent of the concentration of reactants.

Question 2

The rate of a reaction is proportional to ________.

Accepted Answer

A) the total number of collisions that occur per unit time 
B) the fraction of collisions with energy larger than the energy of activation 
C) the fraction of collisions with the proper orientation 
D) All of the above are correct. 
A) the total number of collisions that occur per unit time 
B) the fraction of collisions with energy larger than the energy of activation 
C) the fraction of collisions with the proper orientation 
D) All of the above are correct.

Question 3

Which of the following can be done to increase the likelihood that a chemical reaction will take place?

Accepted Answer

A) decrease the average speed of the reacting molecules 
B) induce more collisions between reacting molecules 
C) remove all the water from the reaction mixture 
D) break the reaction up into a series of steps 
A) decrease the average speed of the reacting molecules 
B) induce more collisions between reacting molecules 
C) remove all the water from the reaction mixture 
D) break the reaction up into a series of steps

Question 4

A catalyst need not be present in large quantities.

Accepted Answer

A) True 
 B)False

Question 5

The reaction energy profile can tell if a reaction is exothermic or endothermic.

Accepted Answer

A) True 
 B)False

Question 6

Which of the following is an example of a substitution reaction?

Accepted Answer

A) CH3CH2OH + Br- → CH3CH2Br + OH- 
B) 2MnO4- + 5C2O42- + 16H+ → 10CO2 + 2Mn2+ + 8H2O 
C) 2Mg + O2 → 2MgO 
D) I2 + H2 → 2HI 
A) CH3CH2OH + Br- → CH3CH2Br + OH- 
B) 2MnO4- + 5C2O42- + 16H+ → 10CO2 + 2Mn2+ + 8H2O 
C) 2Mg + O2 → 2MgO 
D) I2 + H2 → 2HI

Question 7

Which of the following "adjustments" can be made to a chemical reaction system to increase the rate of reaction?

Accepted Answer

A) increase the reaction temperature 
B) increase the concentrations of the reactants 
C) add a catalyst 
D) All of the above will increase the rate of reaction. 
E) None of the above will increase the rate of reaction. 
A) increase the reaction temperature 
B) increase the concentrations of the reactants 
C) add a catalyst 
D) All of the above will increase the rate of reaction. 
E) None of the above will increase the rate of reaction.

Question 8

In the following equation 2Y (g)→ Z (g)at 20 °C the following data were obtained:   The rate law for this reaction is ________.

Accepted Answer

A) Rate = -k[Y]2  
B) Rate = -k[Y] 
C) Rate = -k[Y]0 
D) Rate = -k[Y]-1 
A) Rate = -k[Y]2  
B) Rate = -k[Y] 
C) Rate = -k[Y]0 
D) Rate = -k[Y]-1

Question 9

An exothermic reaction usually leads to a release in energy.

Accepted Answer

A) True 
 B)False

Question 10

The rate determining step is always the fastest step.

Accepted Answer

A) True 
 B)False

Question 11

An exothermic reaction would feel cold.

Accepted Answer

A) True 
 B)False

Question 12

The units for the rate of a reaction are ________.

Accepted Answer

A) concentration per unit of time 
B) concentration multiplied by the unit of time 
C) unit of time per unit of concentration 
D) One cannot say with certainty since rate laws vary from reaction to reaction. 
A) concentration per unit of time 
B) concentration multiplied by the unit of time 
C) unit of time per unit of concentration 
D) One cannot say with certainty since rate laws vary from reaction to reaction.

Question 13

The rate constant of a reaction may be increased by ________.

Accepted Answer

A) increasing the concentration of reactants 
B) increasing the temperature 
C) adding a catalyst 
D) all of the above 
A) increasing the concentration of reactants 
B) increasing the temperature 
C) adding a catalyst 
D) all of the above

Question 14

If the products have a higher energy than the reactants ________.

Accepted Answer

A) the reaction is exothermic 
B) the reaction is endothermic 
C) the reactants have less energy than the products 
D) both B and C 
A) the reaction is exothermic 
B) the reaction is endothermic 
C) the reactants have less energy than the products 
D) both B and C

Question 15

Reaction rates can be varied by changing either the concentrations of the reacting species or the temperature at which the reaction is carried out.

Accepted Answer

A) True 
 B)False

Question 16

In each of the following diagrams, the x-axis is the reaction coordinate and the y-axis is the potential energy. Which diagram corresponds to a reaction that has an activation energy of 35 kJ and an overall reaction energy of -110 kJ?

Accepted Answer

A) 
  
B) 
  
C) 
  
D) 
  
A) 
  
B) 
  
C) 
  
D)

Question 17

In the following equation 2 Y (g)+ X (g)→ Z (g)at 100 °C the following data were obtained:   The rate law for this reaction is ________.

Accepted Answer

A) Rate = k[Y]2[X] 
B) Rate = k[Y][X]2 
C) Rate = k[Y][X] 
D) Rate = k[Y]2[X]2 
A) Rate = k[Y]2[X] 
B) Rate = k[Y][X]2 
C) Rate = k[Y][X] 
D) Rate = k[Y]2[X]2

Question 18

Which statement is true about the reaction energy profile?

Accepted Answer

A) plots the relative energies of both the reactants and products 
B) plots energy on the y-axis 
C) traces the progress of the reaction on the x-axis 
D) All of the above are true. 
A) plots the relative energies of both the reactants and products 
B) plots energy on the y-axis 
C) traces the progress of the reaction on the x-axis 
D) All of the above are true.

Question 19

Consider the reaction X → Y with the following data: Energy of reactants = 50 kJ/mole;
Energy of reaction = -30 kJ/mole;
Energy of transition state = 90 kJ/mole.
The energy of products for the reaction is ________ kJ/mole.

Accepted Answer

A) -30 
B) 20 
C) 30 
D) 80 
A) -30 
B) 20 
C) 30 
D) 80

Which of the following statements is false?

The rate of a reaction is proportional to ________.

Which of the following can be done to increase the likelihood that a chemical reaction will take place?

A catalyst need not be present in large quantities.

The reaction energy profile can tell if a reaction is exothermic or endothermic.

Which of the following is an example of a substitution reaction?

Which of the following "adjustments" can be made to a chemical reaction system to increase the rate of reaction?

In the following equation 2Y (g)→ Z (g)at 20 °C the following data were obtained: The rate law for this reaction is ________.

An exothermic reaction usually leads to a release in energy.

The rate determining step is always the fastest step.

An exothermic reaction would feel cold.

The units for the rate of a reaction are ________.

The rate constant of a reaction may be increased by ________.

If the products have a higher energy than the reactants ________.

Reaction rates can be varied by changing either the concentrations of the reacting species or the temperature at which the reaction is carried out.

In each of the following diagrams, the x-axis is the reaction coordinate and the y-axis is the potential energy. Which diagram corresponds to a reaction that has an activation energy of 35 kJ and an overall reaction energy of -110 kJ?

In the following equation 2 Y (g)+ X (g)→ Z (g)at 100 °C the following data were obtained: The rate law for this reaction is ________.

Which statement is true about the reaction energy profile?

Consider the reaction X → Y with the following data: Energy of reactants = 50 kJ/mole; Energy of reaction = -30 kJ/mole; Energy of transition state = 90 kJ/mole. The energy of products for the reaction is ________ kJ/mole.

What Is Chemistry

The Numerical Side of Chemistry

The Evolution of Atomic Theory

The Modern Model of the Atom

Chemical Bonding and Nomenclature

The Shape of Molecules

Intermolecular Forces and the Phases of Matter

Chemical Reactions

Stoichiometry and the Mole

Electron Transfer in Chemical Reactions

What If There Were No Intermolecular Forces the Ideal Gas

Solutions

Chemical Equilibrium

Electrolytes, Acids, and Bases

Nuclear Chemistry

The Chemistry of Carbon

Synthetic and Biological Polymers

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Exam 13: When Reactants Turn Into Products

Which of the following statements is false?

The rate of a reaction is proportional to ________.

Which of the following can be done to increase the likelihood that a chemical reaction will take place?

A catalyst need not be present in large quantities.

The reaction energy profile can tell if a reaction is exothermic or endothermic.

Which of the following is an example of a substitution reaction?

Which of the following "adjustments" can be made to a chemical reaction system to increase the rate of reaction?

In the following equation 2Y (g)→ Z (g)at 20 °C the following data were obtained: The rate law for this reaction is ________.

An exothermic reaction usually leads to a release in energy.

The rate determining step is always the fastest step.

An exothermic reaction would feel cold.

The units for the rate of a reaction are ________.

The rate constant of a reaction may be increased by ________.

If the products have a higher energy than the reactants ________.

Reaction rates can be varied by changing either the concentrations of the reacting species or the temperature at which the reaction is carried out.

In each of the following diagrams, the x-axis is the reaction coordinate and the y-axis is the potential energy. Which diagram corresponds to a reaction that has an activation energy of 35 kJ and an overall reaction energy of -110 kJ?

In the following equation 2 Y (g)+ X (g)→ Z (g)at 100 °C the following data were obtained: The rate law for this reaction is ________.

Which statement is true about the reaction energy profile?

Consider the reaction X → Y with the following data: Energy of reactants = 50 kJ/mole; Energy of reaction = -30 kJ/mole; Energy of transition state = 90 kJ/mole. The energy of products for the reaction is ________ kJ/mole.

What Is Chemistry

The Numerical Side of Chemistry

The Evolution of Atomic Theory

The Modern Model of the Atom

Chemical Bonding and Nomenclature

The Shape of Molecules

Intermolecular Forces and the Phases of Matter

Chemical Reactions

Stoichiometry and the Mole

Electron Transfer in Chemical Reactions

What If There Were No Intermolecular Forces the Ideal Gas

Solutions

Chemical Equilibrium

Electrolytes, Acids, and Bases

Nuclear Chemistry

The Chemistry of Carbon

Synthetic and Biological Polymers

Filters