Question 1

In an exothermic reaction,heat is liberated to the surroundings.

Accepted Answer

A) True 
 B)False

Question 2

Which ions in the following reaction would be classified as spectator ions?
Zn + 2H+ + 2Cl$\rarr$ Zn2+ + 2Cl- + H2

Accepted Answer

A)  Zn2+ 
B)  H+ 
C)  Cl- 
D)  More than one response is correct. 
A)  Zn2+ 
B)  H+ 
C)  Cl- 
D)  More than one response is correct.

Question 3

In ionic compounds,metals have a positive oxidation number.

Accepted Answer

A) True 
 B)False

Question 4

What substance is oxidized in the following reaction?
4HCl + MnO2 $\rarr$ Cl2 + 2H2O + MnCl2

Accepted Answer

A)  Cl in HCl 
B)  Mn in MnO2 
C)  H in HCl 
D)  O in MnO2 
A)  Cl in HCl 
B)  Mn in MnO2 
C)  H in HCl 
D)  O in MnO2

Question 5

Redox reactions may also be a decomposition reaction.

Accepted Answer

A) True 
 B)False

Question 6

Which of the following statements is not true about the reaction?
2 CH4 + 3 O2 $\rarr$ 2 CO2 + 4 H2O

Accepted Answer

A)  Water is a reactant. 
B)  Methane and carbon dioxide are products. 
C)  Methane is a product. 
D)  Water and carbon dioxide are products. 
A)  Water is a reactant. 
B)  Methane and carbon dioxide are products. 
C)  Methane is a product. 
D)  Water and carbon dioxide are products.

Question 7

Single replacement reactions are always

Accepted Answer

A)  redox reactions. 
B)  nonredox reactions. 
C)  combination reactions. 
D)  decomposition reactions. 
A)  redox reactions. 
B)  nonredox reactions. 
C)  combination reactions. 
D)  decomposition reactions.

Question 8

Which of the following equations (not balanced)represents an oxidation-reduction process?

Accepted Answer

A)  AgNO3 + NaCl $\rarr$  AgCl + NaNO3 
B)  C + O2 $\rarr$ CO2 
C)  C2H4 + O2 $\rarr$ CO2 + H2O 
D)  more than one response is correct 
A)  AgNO3 + NaCl $\rarr$  AgCl + NaNO3 
B)  C + O2 $\rarr$ CO2 
C)  C2H4 + O2 $\rarr$ CO2 + H2O 
D)  more than one response is correct

Question 9

Given the equation 2CO + O2 $\rarr$  2CO2,how many grams of CO2 form if 34.0 grams of CO are combined with excess oxygen?

Accepted Answer

A)  53.4 
B)  21.6 
C)  145 
D)  107 
A)  53.4 
B)  21.6 
C)  145 
D)  107

Question 10

The oxidation number of iodine in HIO4 is +6.

Accepted Answer

A) True 
 B)False

Question 11

What is the reducing agent in the following reaction?
4HCl + MnO2$\rarr$ Cl2 + 2H2O + MnCl2

Accepted Answer

A)  HCl 
B)  Cl2 
C)  MnO2 
D)  MnCl2 
A)  HCl 
B)  Cl2 
C)  MnO2 
D)  MnCl2

Question 12

A net ionic equation may include one or more spectator ions.

Accepted Answer

A) True 
 B)False

Question 13

A percentage yield less than 100% is often obtained in a reaction.What is(are)the reason for obtaining less than theoretically predicted?

Accepted Answer

A)  Side reactions occurred 
B)  poor laboratory technique 
C)  reaction did not go to completion 
D)  all of the choices 
A)  Side reactions occurred 
B)  poor laboratory technique 
C)  reaction did not go to completion 
D)  all of the choices

Question 14

Barium sulfate is often ingested to aid in the diagnosis of GI tract disorders.The equation for its production is Ba2+ + SO $\rarr$  BaSO4(s).What type of equation is this?

Accepted Answer

A)  a total ionic equation 
B)  a full equation 
C)  an oxidation-reduction equation 
D)  a net ionic equation 
A)  a total ionic equation 
B)  a full equation 
C)  an oxidation-reduction equation 
D)  a net ionic equation

Question 15

Most reactions give a percent yield of almost 100%.

Accepted Answer

A) True 
 B)False

Question 16

The Haber Process is a method for the production of ammonia,an important chemical intermediate.The reaction for this process is
N2 + 3H2 $\rarr$ 2NH3
According to the mole interpretation,how many grams of NH3 could be produced by the complete reaction of 2.80 grams of N2 and excess H2?

Accepted Answer

A)  34.0 
B)  17.0 
C)  3.10 
D)  3.40 
A)  34.0 
B)  17.0 
C)  3.10 
D)  3.40

Question 17

The reaction 2KBr + F2 $\rarr$  2KF + Br2 is an example of a _____ reaction.

Accepted Answer

A)  spectator 
B)  metaphysical 
C)  single replacement 
D)  double replacement 
A)  spectator 
B)  metaphysical 
C)  single replacement 
D)  double replacement

Question 18

In the real world,one should not expect to obtain as much product as can be predicted from the stoichiometric calculation.

Accepted Answer

A) True 
 B)False

Question 19

In the equation for an endothermic reaction,the word "heat" appears

Accepted Answer

A)  on the right side. 
B)  on the left side. 
C)  on both sides. 
D)  on neither side. 
A)  on the right side. 
B)  on the left side. 
C)  on both sides. 
D)  on neither side.

Question 20

What is the oxidizing agent in the following reaction?
4HCl + MnO2 $\rarr$  Cl2 + 2H2O + MnCl2

Accepted Answer

A)  HCl 
B)  Cl2 
C)  MnO2 
D)  MnCl2 
A)  HCl 
B)  Cl2 
C)  MnO2 
D)  MnCl2

Exam 5: Chemical Reactions

In an exothermic reaction,heat is liberated to the surroundings.

Which ions in the following reaction would be classified as spectator ions? Zn + 2H+ + 2Cl →\rarr→ Zn2+ + 2Cl- + H2

In ionic compounds,metals have a positive oxidation number.

What substance is oxidized in the following reaction? 4HCl + MnO2 →\rarr→ Cl2 + 2H2O + MnCl2

Redox reactions may also be a decomposition reaction.

Which of the following statements is not true about the reaction? 2 CH4 + 3 O2 →\rarr→ 2 CO2 + 4 H2O

Single replacement reactions are always

Which of the following equations (not balanced)represents an oxidation-reduction process?

Given the equation 2CO + O2 →\rarr→ 2CO2,how many grams of CO2 form if 34.0 grams of CO are combined with excess oxygen?

The oxidation number of iodine in HIO4 is +6.

What is the reducing agent in the following reaction? 4HCl + MnO2 →\rarr→ Cl2 + 2H2O + MnCl2

A net ionic equation may include one or more spectator ions.

A percentage yield less than 100% is often obtained in a reaction.What is(are)the reason for obtaining less than theoretically predicted?

Barium sulfate is often ingested to aid in the diagnosis of GI tract disorders.The equation for its production is Ba2+ + SO →\rarr→ BaSO4(s).What type of equation is this?

Most reactions give a percent yield of almost 100%.

The Haber Process is a method for the production of ammonia,an important chemical intermediate.The reaction for this process is N2 + 3H2 →\rarr→ 2NH3 According to the mole interpretation,how many grams of NH3 could be produced by the complete reaction of 2.80 grams of N2 and excess H2?

The reaction 2KBr + F2 →\rarr→ 2KF + Br2 is an example of a _____ reaction.

In the real world,one should not expect to obtain as much product as can be predicted from the stoichiometric calculation.

In the equation for an endothermic reaction,the word "heat" appears

What is the oxidizing agent in the following reaction? 4HCl + MnO2 →\rarr→ Cl2 + 2H2O + MnCl2

Matter, measurements, and Calculations

Atoms and Molecules

Electronic Structure and the Periodic Law

Forces Between Particles

The States of Matter

Solutions and Colloids

Reaction Rates and Equilibrium

Acids,bases,and Salts

Radioactivity and Nuclear Processes

Organic Compounds: Alkanes

Unsaturated Hydrocarbons

Alcohols, phenols, and Ethers

Aldehydes and Ketones

Carboxylic Acids and Esters

Amines and Amides

Carbohydrates

Lipids

Proteins

Enzymes

Nucleic Acids and Protein Synthesis

Nutrition and Energy for Life

Carbohydrate Metabolism

Lipid and Amino Acid Metabolism

Body Fluids

Filters

Which ions in the following reaction would be classified as spectator ions? Zn + 2H⁺ + 2Cl $\rarr$ Zn²⁺ + 2Cl^- + H₂

What substance is oxidized in the following reaction? 4HCl + MnO₂ $\rarr$ Cl₂ + 2H₂O + MnCl₂

Which of the following statements is not true about the reaction? 2 CH₄ + 3 O₂ $\rarr$ 2 CO₂+ 4 H₂O

Given the equation 2CO + O₂ $\rarr$ 2CO₂,how many grams of CO₂ form if 34.0 grams of CO are combined with excess oxygen?

The oxidation number of iodine in HIO₄ is +6.

What is the reducing agent in the following reaction? 4HCl + MnO₂ $\rarr$ Cl₂ + 2H₂O + MnCl₂

Barium sulfate is often ingested to aid in the diagnosis of GI tract disorders.The equation for its production is Ba²⁺ + SO $\rarr$ BaSO₄(s).What type of equation is this?

The Haber Process is a method for the production of ammonia,an important chemical intermediate.The reaction for this process is N₂ + 3H₂ $\rarr$ 2NH₃ According to the mole interpretation,how many grams of NH₃ could be produced by the complete reaction of 2.80 grams of N₂ and excess H₂?

The reaction 2KBr + F₂ $\rarr$ 2KF + Br₂ is an example of a _____ reaction.

What is the oxidizing agent in the following reaction? 4HCl + MnO₂ $\rarr$ Cl₂ + 2H₂O + MnCl₂