Question 1

If the forward reaction is exothermic, the reverse is endothermic.

Accepted Answer

A) True 
 B)False  True

Question 2

Which of the following does not influence the speed of a chemical reaction?

Accepted Answer

A)  concentration of the reactants 
B)  molecular mass of the reactants 
C)  surface area of solid reactants 
D)  temperature 
A)  concentration of the reactants 
B)  molecular mass of the reactants 
C)  surface area of solid reactants 
D)  temperature B

Question 3

The energy of activation may be affected by ________.

Accepted Answer

A)  increasing the concentration of the reactants 
B)  higher temperature 
C)  decreasing the concentration of the reactants 
D)  the presence of a catalyst 
A)  increasing the concentration of the reactants 
B)  higher temperature 
C)  decreasing the concentration of the reactants 
D)  the presence of a catalyst D

Question 4

Match the rate of each reaction with the overall order .
-Rate = k[A]2[B]2

Accepted Answer

A) 3 
B) 1 
C) 0 
D) 2 
E) 4 
A) 3 
B) 1 
C) 0 
D) 2 
E) 4

Question 5

A catalyst works by providing a new mechanism, higher in energy that the original reaction.

Accepted Answer

A) True 
 B)False

Question 6

If the kinetic energy of the reactant molecules is not high enough to overcome the activation energy barrier, ________.

Accepted Answer

A)  the reverse reaction will occur 
B)  no reaction takes place 
C)  the reaction will occur anyway 
D)  the products will form at a slower rate 
A)  the reverse reaction will occur 
B)  no reaction takes place 
C)  the reaction will occur anyway 
D)  the products will form at a slower rate

Question 7

Compare the roles of catalysts and enzymes in chemical reactions:
a) How are enzymes and catalysts similar? How are they different?
b) Describe a chemical process that is aided by enzyme action.

Accepted Answer

a) Both will lower the activation energy

Question 8

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 40 kJ and an overall reaction energy of -125 kJ?

Accepted Answer

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

Question 9

Match the rate of each reaction with the overall order .
-Rate = k[A]/[B]

Accepted Answer

A) 3 
B) 1 
C) 0 
D) 2 
E) 4 
A) 3 
B) 1 
C) 0 
D) 2 
E) 4

Question 10

Examine this reaction coordinate diagram and answer the questions that follow.   a) Estimate the value for the activation energy for this reaction.
b) Calculate ΔErxn.
c) Is this reaction exothermic or endothermic?

Accepted Answer

a) 350 kJ/

Question 11

Write the overall balanced equation that is consistent with the following mechanism:
Step 1:   ↔   (fast)
Step 2:   +   → 2HI (slow)
Next, give a rate law expression that is consistent with this proposed mechanism.
Explain a series of three experiments that could help you to determine the values for the overall order of reaction, and the orders of the individual terms in your proposed rate law expression.

Accepted Answer

I₂ + H₂ → 2HI
rate = k[H₂][I₂]
Any varia

Question 12

Based on the collision theory, adding a catalyst to a reaction increases the reaction rate.

Accepted Answer

A) True 
 B)False

Question 13

In an exothermic reaction, more energy is absorbed on the reactant bonds breaking than is released as the product bonds form.

Accepted Answer

A) True 
 B)False

Question 14

For chemical reactions to occur at all, "old" bonds must be broken and "new" bonds must form.

Accepted Answer

A) True 
 B)False

Question 15

The transition state for a reaction occurs at the bottom of the energy barrier.

Accepted Answer

A) True 
 B)False

Question 16

The above data were obtained in a kinetic study of the reaction.
a) Determine the orders x and y, assuming that rate = k[NO]x[CL₂]y.
b) Determine the value for the rate constant, k, in Experiment 2.
c) Determine the overall order of this reaction.

Accepted Answer

a) x = 2 (second order in NO),

Question 17

Which of the following is true about a catalyst?

Accepted Answer

A)  It increases the rate of a reaction. 
B)  It can be used in trace amounts. 
C)  It is not used up in the process. 
D)  All of the above are true. 
A)  It increases the rate of a reaction. 
B)  It can be used in trace amounts. 
C)  It is not used up in the process. 
D)  All of the above are true.

Question 18

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

Question 19

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 20

For an endothermic reaction, the value for ΔErxn is a negative number.

Accepted Answer

A) True 
 B)False

If the forward reaction is exothermic, the reverse is endothermic.

Which of the following does not influence the speed of a chemical reaction?

The energy of activation may be affected by ________.

Match the rate of each reaction with the overall order . -Rate = k[A]2[B]2

A catalyst works by providing a new mechanism, higher in energy that the original reaction.

If the kinetic energy of the reactant molecules is not high enough to overcome the activation energy barrier, ________.

Compare the roles of catalysts and enzymes in chemical reactions: a) How are enzymes and catalysts similar? How are they different? b) Describe a chemical process that is aided by enzyme action.

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 40 kJ and an overall reaction energy of -125 kJ?

Match the rate of each reaction with the overall order . -Rate = k[A]/[B]

Examine this reaction coordinate diagram and answer the questions that follow. a) Estimate the value for the activation energy for this reaction. b) Calculate ΔErxn. c) Is this reaction exothermic or endothermic?

Based on the collision theory, adding a catalyst to a reaction increases the reaction rate.

In an exothermic reaction, more energy is absorbed on the reactant bonds breaking than is released as the product bonds form.

For chemical reactions to occur at all, "old" bonds must be broken and "new" bonds must form.

The transition state for a reaction occurs at the bottom of the energy barrier.

The above data were obtained in a kinetic study of the reaction. a) Determine the orders x and y, assuming that rate = k[NO]x[CL₂]y. b) Determine the value for the rate constant, k, in Experiment 2. c) Determine the overall order of this reaction.

Which of the following is true about a catalyst?

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.

The units for the rate of a reaction are ________.

For an endothermic reaction, the value for ΔErxn is a negative number.

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

If the forward reaction is exothermic, the reverse is endothermic.

Which of the following does not influence the speed of a chemical reaction?

The energy of activation may be affected by ________.

Match the rate of each reaction with the overall order . -Rate = k[A]2[B]2

A catalyst works by providing a new mechanism, higher in energy that the original reaction.

If the kinetic energy of the reactant molecules is not high enough to overcome the activation energy barrier, ________.

Compare the roles of catalysts and enzymes in chemical reactions: a) How are enzymes and catalysts similar? How are they different? b) Describe a chemical process that is aided by enzyme action.

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 40 kJ and an overall reaction energy of -125 kJ?

Match the rate of each reaction with the overall order . -Rate = k[A]/[B]

Examine this reaction coordinate diagram and answer the questions that follow. a) Estimate the value for the activation energy for this reaction. b) Calculate ΔErxn. c) Is this reaction exothermic or endothermic?

Based on the collision theory, adding a catalyst to a reaction increases the reaction rate.

In an exothermic reaction, more energy is absorbed on the reactant bonds breaking than is released as the product bonds form.

For chemical reactions to occur at all, "old" bonds must be broken and "new" bonds must form.

The transition state for a reaction occurs at the bottom of the energy barrier.

The above data were obtained in a kinetic study of the reaction. a) Determine the orders x and y, assuming that rate = k[NO]x[CL₂]y. b) Determine the value for the rate constant, k, in Experiment 2. c) Determine the overall order of this reaction.

Which of the following is true about a catalyst?

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.

The units for the rate of a reaction are ________.

For an endothermic reaction, the value for ΔErxn is a negative number.

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