Question 1

For the indicated element, select the correct oxidation number from the response list: oxidation number of Mn in Mn3+.

Accepted Answer

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

Question 2

Most reactions are carried out in liquid solution or in the gaseous phase because in such situations

Accepted Answer

A)  Activation energies are higher. 
B)  It is easier for reactants to come in contact with each other. 
C)  Kinetic energies of reactants are lower. 
D)  Products are less apt to decompose. 
A)  Activation energies are higher. 
B)  It is easier for reactants to come in contact with each other. 
C)  Kinetic energies of reactants are lower. 
D)  Products are less apt to decompose.

Question 3

Which of the following changes is most likely to decrease reaction rate for the chemical reaction 2CO + O2 F1F1F1S1F1F1F10 2CO2?

Accepted Answer

A)  adding twice as much O2 to the reaction mixture 
B)  tripling the temperature of the reaction mixture 
C)  adding a catalyst to the reaction mixture 
D)  removing some CO from the reaction mixture 
A)  adding twice as much O2 to the reaction mixture 
B)  tripling the temperature of the reaction mixture 
C)  adding a catalyst to the reaction mixture 
D)  removing some CO from the reaction mixture

Question 4

For the indicated element, select the correct oxidation number from the response list: oxidation number of S in H2SO4+.

Accepted Answer

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

Question 5

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) Electron loss is always associated with an increase in oxidation number.
(2) An exothermic reaction occurs when the energy required to break bonds in reactants is less than the energy released by bond formation in the products.
(3) The concentrations of pure liquids and pure solids are never included in an equilibrium constant expression because such concentrations never change.

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 6

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) All chemical systems will reach equilibrium if enough time elapses.
(2) A substance that functions as a reducing agent is, itself, oxidized.
(3) In a slow reaction, the activation energy is far greater than the average energy content of the reacting particles.

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 7

Assign the following reaction to one of the reaction classifications given in the response list: 2NO2 + H2O2 F1F1F1S1F1F1F10 2HNO3

Accepted Answer

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

Question 8

The proper assignment of oxidation numbers to the elements in the compound LiAsO3 would be

Accepted Answer

A)  +1 for Li, +5 for As and -2 for O 
B)  +1 for Li, +5 for As and -6 for O 
C)  +1 for Li, +1 for As and -2 for O 
D)  +2 for Li, +4 for As and -6 for O 
A)  +1 for Li, +5 for As and -2 for O 
B)  +1 for Li, +5 for As and -6 for O 
C)  +1 for Li, +1 for As and -2 for O 
D)  +2 for Li, +4 for As and -6 for O

Question 9

CO2 and H2 are allowed to react until equilibrium is established as follows:   Which of the following changes will cause the equilibrium position to shift to the right?

Accepted Answer

A)  increase in the concentration of H2 
B)  decrease in the concentration of CO 
C)  decrease in the concentration of CO2 
D)  more than one correct response 
E)  no correct response 
A)  increase in the concentration of H2 
B)  decrease in the concentration of CO 
C)  decrease in the concentration of CO2 
D)  more than one correct response 
E)  no correct response

Question 10

Combustion reactions are characterized by

Accepted Answer

A)  oxygen always being one of the reactants 
B)  water always being one of the products 
C)  carbon dioxide always being one of the products 
D)  both reactants always being elements 
A)  oxygen always being one of the reactants 
B)  water always being one of the products 
C)  carbon dioxide always being one of the products 
D)  both reactants always being elements

Question 11

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 collision between two reactant molecules does not always result in the formation of reaction products.
(2) The substance oxidized in a reaction may be either a reactant or a product.
(3) At chemical equilibrium, the concentrations of reactants and products cease to change.

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 12

Which of the following statements concerning oxidation and reduction is correct?

Accepted Answer

A)  They cannot occur independently of each other. 
B)  They accompany all chemical changes. 
C)  They describe, respectively, the gain and loss of electrons. 
D)  More than one correct response. 
E)  No correct response. 
A)  They cannot occur independently of each other. 
B)  They accompany all chemical changes. 
C)  They describe, respectively, the gain and loss of electrons. 
D)  More than one correct response. 
E)  No correct response.

Question 13

Consider the following redox equation: SO2 + NO2 F1F1F1S1F1F1F10 SO3 + NO, choose an appropriate chemical formula from the list that identifies the oxidizing agent.

Accepted Answer

A)  SO2 
B)  SO3 
C)  NO 
D)  NO2 
A)  SO2 
B)  SO3 
C)  NO 
D)  NO2

Question 14

Assign the following reaction to one of the reaction classifications given in the response list: Mg + 2HCl F1F1F1S1F1F1F10 MgCl2 + H2

Accepted Answer

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

Question 15

In writing an equilibrium constant expression, which of the following is incorrect?

Accepted Answer

A)  Concentrations are always expressed in molarities. 
B)  Product concentrations are always placed in the numerator of the expression. 
C)  Concentrations of pure solids and pure liquids are always placed in the denominator of the expression. 
D)  More than one correct response. 
E)  No correct response. 
A)  Concentrations are always expressed in molarities. 
B)  Product concentrations are always placed in the numerator of the expression. 
C)  Concentrations of pure solids and pure liquids are always placed in the denominator of the expression. 
D)  More than one correct response. 
E)  No correct response.

Question 16

According to Le Chatelier's principle, which of the following changes will shift the position of the equilibrium to the left for the reaction

Accepted Answer

A)  double the concentration of N2 
B)  decrease the concentration of NH3 
C)  increase the concentration of H2 
D)  triple the temperature 
A)  double the concentration of N2 
B)  decrease the concentration of NH3 
C)  increase the concentration of H2 
D)  triple the temperature

Question 17

The minimum combined kinetic energy reactant particles must possess in order for their collision to result in a reaction is called the

Accepted Answer

A)  dissociation energy 
B)  collision energy 
C)  activation energy 
D)  orientation energy 
A)  dissociation energy 
B)  collision energy 
C)  activation energy 
D)  orientation energy

Question 18

Consider the following equilibrim:   Determine the effect on the position of equilibrium when a catalyst is added.

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 19

Consider the following equilibrim:   Determine the effect on the position of equilibrium when some H2 is added.

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 20

Which of the following statements concerning redox reactions is incorrect?

Accepted Answer

A)  The oxidizing agent is the substance reduced. 
B)  The reducing agent is the substance oxidized. 
C)  The oxidizing agent loses electrons. 
D)  The substance oxidized loses electrons. 
A)  The oxidizing agent is the substance reduced. 
B)  The reducing agent is the substance oxidized. 
C)  The oxidizing agent loses electrons. 
D)  The substance oxidized loses electrons.

Exam 9: Chemical Reactions

For the indicated element, select the correct oxidation number from the response list: oxidation number of Mn in Mn3+.

Most reactions are carried out in liquid solution or in the gaseous phase because in such situations

Which of the following changes is most likely to decrease reaction rate for the chemical reaction 2CO + O2  2CO2?

For the indicated element, select the correct oxidation number from the response list: oxidation number of S in H2SO4+.

Assign the following reaction to one of the reaction classifications given in the response list: 2NO2 + H2O2  2HNO3

The proper assignment of oxidation numbers to the elements in the compound LiAsO3 would be

CO2 and H2 are allowed to react until equilibrium is established as follows: Which of the following changes will cause the equilibrium position to shift to the right?

Combustion reactions are characterized by

Which of the following statements concerning oxidation and reduction is correct?

Consider the following redox equation: SO2 + NO2  SO3 + NO, choose an appropriate chemical formula from the list that identifies the oxidizing agent.

Assign the following reaction to one of the reaction classifications given in the response list: Mg + 2HCl  MgCl2 + H2

In writing an equilibrium constant expression, which of the following is incorrect?

According to Le Chatelier's principle, which of the following changes will shift the position of the equilibrium to the left for the reaction

The minimum combined kinetic energy reactant particles must possess in order for their collision to result in a reaction is called the

Consider the following equilibrim: Determine the effect on the position of equilibrium when a catalyst is added.

Consider the following equilibrim: Determine the effect on the position of equilibrium when some H2 is added.

Which of the following statements concerning redox reactions is incorrect?

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

Saturated Hydrocarbons

Unsaturated Hydrocarbons

Alcohols, Phenols, and Ethers

Aldehydes and Ketones

Carboxylic Acids, Esters, and Other Acid Derivatives

Amines and Amides

Carbohydrates

Lipids

Proteins

Enzymes and Vitamins

Nucleic Acids

Biochemical Energy Production

Carbohydrate Metabolism

Lipid Metabolism

Protein Metabolism

Filters

For the indicated element, select the correct oxidation number from the response list: oxidation number of Mn in Mn³⁺.

Which of the following changes is most likely to decrease reaction rate for the chemical reaction 2CO + O₂  2CO₂?

For the indicated element, select the correct oxidation number from the response list: oxidation number of S in H₂SO₄⁺.

Assign the following reaction to one of the reaction classifications given in the response list: 2NO₂ + H₂O₂  2HNO₃

The proper assignment of oxidation numbers to the elements in the compound LiAsO₃ would be

CO₂ and H₂ are allowed to react until equilibrium is established as follows: Which of the following changes will cause the equilibrium position to shift to the right?

Consider the following redox equation: SO₂ + NO₂  SO₃ + NO, choose an appropriate chemical formula from the list that identifies the oxidizing agent.

Assign the following reaction to one of the reaction classifications given in the response list: Mg + 2HCl  MgCl₂ + H₂

Consider the following equilibrim: Determine the effect on the position of equilibrium when some H₂ is added.