Question 1

CO2 and H2 are allowed to react until an equilibrium is established as follows:   What will be the effect on the equilibrium of removing CO from the equilibrium mixture?

Accepted Answer

A)  The equilibrium will favor the reactants side. 
B)  H2 concentration will double 
C)  CO and CO2 concentrations will double 
D)  H2 concentration will decrease and H2O concentration will increase 
A)  The equilibrium will favor the reactants side. 
B)  H2 concentration will double 
C)  CO and CO2 concentrations will double 
D)  H2 concentration will decrease and H2O concentration will increase

Question 2

For the indicated element, select the correct oxidation number from the response list: oxidation number of Fe in Fe2O3+.

Accepted Answer

A)  +2 
B)  +3 
C)  +4 
D)  +6 
A)  +2 
B)  +3 
C)  +4 
D)  +6

Question 3

In the redox reaction 2MnBr3 + SnBr2 F1F1F1S1F1F1F10 2MnBr2 + SnBr4

Accepted Answer

A)  SnBr2 is the oxidizing agent 
B)  MnBr3 is the substance oxidized 
C)  Sn undergoes an oxidation number change of two units 
D)  Mn undergoes an oxidation number change of six units 
A)  SnBr2 is the oxidizing agent 
B)  MnBr3 is the substance oxidized 
C)  Sn undergoes an oxidation number change of two units 
D)  Mn undergoes an oxidation number change of six units

Question 4

Which element is oxidized in the following redox reaction? 2H2S + O2 F1F1F1S1F1F1F10 2H2O + S

Accepted Answer

A)  sulfur in H2S 
B)  hydrogen in H2S 
C)  oxygen in O2 
D)  oxygen in H2O 
A)  sulfur in H2S 
B)  hydrogen in H2S 
C)  oxygen in O2 
D)  oxygen in H2O

Question 5

Which of the following statements about activation energy is correct?

Accepted Answer

A)  It is the same for all reactions. 
B)  It is low for reactions that take place rapidly. 
C)  It is the maximum energy a reacting molecule may possess. 
D)  More than one correct response. 
E)  No correct response. 
A)  It is the same for all reactions. 
B)  It is low for reactions that take place rapidly. 
C)  It is the maximum energy a reacting molecule may possess. 
D)  More than one correct response. 
E)  No correct response.

Question 6

For which of the following equilibrium systems will the equilibrium position shift to the left when a stress of increased pressure (from a volume decrease) is applied?

Accepted Answer

A)    
B)    
C)    
D)  more than one correct response 
E)  no correct response 
A)    
B)    
C)    
D)  more than one correct response 
E)  no correct response

Question 7

Use the following to answer the questions below:
In each of the following multiple-choice questions, characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices:
-Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices: 
(1) A chemical system reaches equilibrium at the instant when the rate of formation of products becomes zero.
(2) One reactant and two or more products is a general characteristic of decomposition reactions.
(3) Catalysts increase reaction rate by providing an alternate reaction pathway with a higher activation energy.

Accepted Answer

A)  All three statements are true. 
B)  Two of the three statements are true. 
C)  Only one of the statements is true. 
D)  None of the statements is true. 
A)  All three statements are true. 
B)  Two of the three statements are true. 
C)  Only one of the statements is true. 
D)  None of the statements is true.

Question 8

Which of the following reactions is a nonredox decomposition reaction?

Accepted Answer

A)  2CuO F1F1F1S1F1F1F10 2Cu + O2 
B)  2KClO3 F1F1F1S1F1F1F10 2KCl + 3 O2 
C)  CaCO3 F1F1F1S1F1F1F10 CaO + CO2 
D)  SO2 + H2O F1F1F1S1F1F1F10 H2SO3 
A)  2CuO F1F1F1S1F1F1F10 2Cu + O2 
B)  2KClO3 F1F1F1S1F1F1F10 2KCl + 3 O2 
C)  CaCO3 F1F1F1S1F1F1F10 CaO + CO2 
D)  SO2 + H2O F1F1F1S1F1F1F10 H2SO3

Question 9

Consider the following equilibrim:   Determine the effect on the position of equilibrium when the volume of the container is increased (pressure decrease).

Accepted Answer

A)  shifts to the right 
B)  shifts to the left 
C)  does not shift 
D)  shifts to both the left and the right 
A)  shifts to the right 
B)  shifts to the left 
C)  does not shift 
D)  shifts to both the left and the right

Question 10

Which of the following general reaction types is characterized by there being a single reactant?

Accepted Answer

A)  combination 
B)  decomposition 
C)  displacement 
D)  exchange 
A)  combination 
B)  decomposition 
C)  displacement 
D)  exchange

Question 11

What is the change in oxidation number for cobalt in the redox reaction 2Co2O3 + 3C F1F1F1S1F1F1F10 4Co + 3CO2

Accepted Answer

A)  +4 to -4 
B)  +2 to 0 
C)  +3 to +4 
D)  +3 to 0 
A)  +4 to -4 
B)  +2 to 0 
C)  +3 to +4 
D)  +3 to 0

Question 12

Which of the following reactions is a non-redox reaction?

Accepted Answer

A)  CaCO3 F1F1F1S1F1F1F10 CaO + CO2 
B)  2KClO3 F1F1F1S1F1F1F10 2KCl + 3 O2 
C)  SO3 + H2O F1F1F1S1F1F1F10 H2SO4 
D)  more than one correct response 
E)  no correct response 
A)  CaCO3 F1F1F1S1F1F1F10 CaO + CO2 
B)  2KClO3 F1F1F1S1F1F1F10 2KCl + 3 O2 
C)  SO3 + H2O F1F1F1S1F1F1F10 H2SO4 
D)  more than one correct response 
E)  no correct response

Question 13

Use the following to answer the questions below:
In each of the following multiple-choice questions, characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices:
-Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices: (1) Of the known atmospheric greenhouse gases, CO2 is both the most abundant and also the most efficient at preventing heat loss from the Earth.
(2) Ozone is a form of oxygen in which there are three atoms per molecule.
(3) A decrease in body temperature slows down the rate of chemical reactions.

Accepted Answer

A)  All three statements are true. 
B)  Two of the three statements are true. 
C)  Only one of the statements is true. 
D)  None of the statements is true. 
A)  All three statements are true. 
B)  Two of the three statements are true. 
C)  Only one of the statements is true. 
D)  None of the statements is true.

Question 14

For a collision between molecules to result in reaction, the molecules must possess a certain minimum energy and

Accepted Answer

A)  exchange electrons 
B)  interact with a catalyst for at least one second 
C)  have a favorable orientation relative to each other when they collide 
D)  more than one correct response 
E)  no correct response 
A)  exchange electrons 
B)  interact with a catalyst for at least one second 
C)  have a favorable orientation relative to each other when they collide 
D)  more than one correct response 
E)  no correct response

Question 15

For the indicated element, select the correct oxidation number from the response list: oxidation number of C in KHCO3+.

Accepted Answer

A)  +2 
B)  +3 
C)  +4 
D)  +6 
A)  +2 
B)  +3 
C)  +4 
D)  +6

Question 16

Use the following to answer the questions below:
In each of the following multiple-choice questions, characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices:
-Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices: (1) The only information needed to write an equilibrium constant expression is a balanced chemical equation with physical state information for the reaction of concern.
(2) The oxidation number of sulfur is the same in the species H2SO4 and SO42-.
(3) Increasing the concentration of a reactant makes collisions between the reactant and other reactants less likely because of "more crowded conditions."

Accepted Answer

A)  All three statements are true. 
B)  Two of the three statements are true. 
C)  Only one of the statements is true. 
D)  None of the statements is true. 
A)  All three statements are true. 
B)  Two of the three statements are true. 
C)  Only one of the statements is true. 
D)  None of the statements is true.

Question 17

Use the following to answer the questions below:
In each of the following multiple-choice questions, characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices:
-Characterize EACH of the three given statements as being TRUE or FALSE and then indicate the collective true-false status of the statements using the choices: (1) When reactants are in the solid state, reaction rate increases as temperature increases and decreases as state of subdivision increases.
(2) An oxidizing agent causes oxidation by providing electrons for the other reactant to accept.
(3) The numerical value of an equilibrium constant must always be greater than one.

Accepted Answer

A)  All three statements are true. 
B)  Two of the three statements are true. 
C)  Only one of the statements is true. 
D)  None of the statements is true. 
A)  All three statements are true. 
B)  Two of the three statements are true. 
C)  Only one of the statements is true. 
D)  None of the statements is true.

Question 18

Assign the following reaction to one of the reaction classifications given in the response list: KCN + HCl F1F1F1S1F1F1F10 HCN + KCl

Accepted Answer

A)  decomposition 
B)  combination 
C)  displacement 
D)  exchange 
A)  decomposition 
B)  combination 
C)  displacement 
D)  exchange

Question 19

In which of the following compounds does Cl have an oxidation number of +5?

Accepted Answer

A)  HClO 
B)  KClO2 
C)  Ca(ClO3)2 
D)  more than one correct response 
E)  no correct response 
A)  HClO 
B)  KClO2 
C)  Ca(ClO3)2 
D)  more than one correct response 
E)  no correct response

Question 20

Which of the following is the correct equilibrium constant expression for the reaction

Accepted Answer

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

Exam 9: Chemical Reactions

CO2 and H2 are allowed to react until an equilibrium is established as follows: What will be the effect on the equilibrium of removing CO from the equilibrium mixture?

For the indicated element, select the correct oxidation number from the response list: oxidation number of Fe in Fe2O3+.

In the redox reaction 2MnBr3 + SnBr2  2MnBr2 + SnBr4

Which element is oxidized in the following redox reaction? 2H2S + O2  2H2O + S

Which of the following statements about activation energy is correct?

For which of the following equilibrium systems will the equilibrium position shift to the left when a stress of increased pressure (from a volume decrease) is applied?

Which of the following reactions is a nonredox decomposition reaction?

Consider the following equilibrim: Determine the effect on the position of equilibrium when the volume of the container is increased (pressure decrease).

Which of the following general reaction types is characterized by there being a single reactant?

What is the change in oxidation number for cobalt in the redox reaction 2Co2O3 + 3C  4Co + 3CO2

Which of the following reactions is a non-redox reaction?

For a collision between molecules to result in reaction, the molecules must possess a certain minimum energy and

For the indicated element, select the correct oxidation number from the response list: oxidation number of C in KHCO3+.

Assign the following reaction to one of the reaction classifications given in the response list: KCN + HCl  HCN + KCl

In which of the following compounds does Cl have an oxidation number of +5?

Which of the following is the correct equilibrium constant expression for the reaction

Basic Concepts About Matter

Measurements in Chemistry

Atomic Structure and the Periodic Table

Chemical Bonding: the Ionic Bond Model

Chemical Bonding: the Covalent Bond Model

Chemical Calculations: Formula Masses, Moles, and Chemical Equations

Gases, Liquids, and Solids

Solutions

Acids, Bases, and Salts

Nuclear Chemistry

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Alcohols, Phenols, and Ethers

Aldehydes and Ketones

Carboxylic Acids, Esters, and Other Acid Derivatives

Amines and Amides

Carbohydrates

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Enzymes and Vitamins

Nucleic Acids

Biochemical Energy Production

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Filters

CO₂ and H₂ are allowed to react until an equilibrium is established as follows: What will be the effect on the equilibrium of removing CO from the equilibrium mixture?

For the indicated element, select the correct oxidation number from the response list: oxidation number of Fe in Fe₂O₃⁺.

In the redox reaction 2MnBr₃ + SnBr₂  2MnBr₂ + SnBr₄

Which element is oxidized in the following redox reaction? 2H₂S + O₂  2H₂O + S

What is the change in oxidation number for cobalt in the redox reaction 2Co₂O₃ + 3C  4Co + 3CO₂

For the indicated element, select the correct oxidation number from the response list: oxidation number of C in KHCO₃⁺.