Question 1

Select the classification for the following reaction. Fe(s) + 2Fe3+(aq) → 3Fe2+(aq)

Accepted Answer

A) Precipitation 
B) Acid-base 
C) Redox 
D) Decomposition 
E) None of these choices are correct. 
A) Precipitation 
B) Acid-base 
C) Redox 
D) Decomposition 
E) None of these choices are correct.

Question 2

Which of the statements below correctly describes the combustion of glucose, shown below? C6H12O6 + 6O2 → 6CO2 + 6H2O

Accepted Answer

A) Hydrogen in C 6H 12O 6 is being reduced. 
B) Oxygen in O 2 is being oxidized. 
C) Hydrogen in C 6H 12O 6 is the reducing agent. 
D) Oxygen in C 6H 12O 6 is the oxidizing agent. 
E) Carbon in C 6H 12O 6 is being oxidized. 
A) Hydrogen in C 6H 12O 6 is being reduced. 
B) Oxygen in O 2 is being oxidized. 
C) Hydrogen in C 6H 12O 6 is the reducing agent. 
D) Oxygen in C 6H 12O 6 is the oxidizing agent. 
E) Carbon in C 6H 12O 6 is being oxidized.

Question 3

Which one of the following substances is a strong acid?

Accepted Answer

A) HNO 3 
B) H 2CO 3 
C) NH 3 
D) CH 3COOH 
E) H 3PO 4 
A) HNO 3 
B) H 2CO 3 
C) NH 3 
D) CH 3COOH 
E) H 3PO 4

Question 4

How many sodium ions are present in 325 mL of 0.850 M Na2SO4?

Accepted Answer

A) 1.66 × 10 23 sodium ions 
B) 3.33 × 10 23 sodium ions 
C) 4.99 × 10 23 sodium ions 
D) 6.20 × 10 23 sodium ions 
E) 1.57 × 10 24 sodium ions 
A) 1.66 × 10 23 sodium ions 
B) 3.33 × 10 23 sodium ions 
C) 4.99 × 10 23 sodium ions 
D) 6.20 × 10 23 sodium ions 
E) 1.57 × 10 24 sodium ions

Question 5

The compound P4O10 is used in refining sugar. Select the classification for the reaction in which it is synthesized. P4(s) + 5O2(g) → P4O10(s)

Accepted Answer

A) Combination 
B) Decomposition 
C) Displacement 
D) Acid-base 
E) Precipitation 
A) Combination 
B) Decomposition 
C) Displacement 
D) Acid-base 
E) Precipitation

Question 6

A base

Accepted Answer

A) causes phenolphthalein indicator to change from colorless to pink. 
B) donates a proton in a proton transfer reaction. 
C) accepts electrons in an electron transfer reaction. 
D) produces hydrogen ions in solution. 
E) None of these choices are correct. 
A) causes phenolphthalein indicator to change from colorless to pink. 
B) donates a proton in a proton transfer reaction. 
C) accepts electrons in an electron transfer reaction. 
D) produces hydrogen ions in solution. 
E) None of these choices are correct.

Question 7

Calculate the oxidation number of sulfur in sodium metabisulfite, Na2S2O5.

Accepted Answer

A) −2 
B) +2 
C) +4 
D) +5 
E) None of these choices are correct. 
A) −2 
B) +2 
C) +4 
D) +5 
E) None of these choices are correct.

Question 8

Select the classification for the following reaction. 2I−(aq) + Cl2(aq) → I2(aq) + 2Cl −(aq)

Accepted Answer

A) Combination 
B) Displacement 
C) Decomposition 
D) Precipitation 
E) Acid-base 
A) Combination 
B) Displacement 
C) Decomposition 
D) Precipitation 
E) Acid-base

Question 9

Select the classification for the following reaction. 2Ag+(aq) + Zn(s) → 2Ag(s) + Zn2+(aq)

Accepted Answer

A) Displacement 
B) Decomposition 
C) Combination 
D) Precipitation 
E) Acid-base 
A) Displacement 
B) Decomposition 
C) Combination 
D) Precipitation 
E) Acid-base

Question 10

Which of the following solutions will be the best conductor of electrical current?

Accepted Answer

A) Methyl alcohol, CH 3OH( aq) 
B) Glucose, C 6H 12O 6( aq) 
C) Potassium chloride, KCl( aq) 
D) Bromine, Br 2( aq) 
E) Ethylene glycol, C 2H 6O 2( aq) 
A) Methyl alcohol, CH 3OH( aq) 
B) Glucose, C 6H 12O 6( aq) 
C) Potassium chloride, KCl( aq) 
D) Bromine, Br 2( aq) 
E) Ethylene glycol, C 2H 6O 2( aq)

Question 11

Oxidation is associated with an increase in oxidation number.

Accepted Answer

A) True 
 B)False

Question 12

Covalent compounds, dissolved in water, never produce conducting solutions.

Accepted Answer

A) True 
 B)False

Question 13

What will be the final volume of a solution prepared by diluting 25 mL of 8.25 M sodium hydroxide to a concentration of 2.40 M?

Accepted Answer

A) 330 mL 
B) 210 mL 
C) 86 mL 
D) 60 mL 
E) 7.3 mL 
A) 330 mL 
B) 210 mL 
C) 86 mL 
D) 60 mL 
E) 7.3 mL

Question 14

Which one of the following substances is the best electrolyte?

Accepted Answer

A) CO 
B) CH 3Cl 
C) CH 4 
D) C 2H 5OH 
E) HCl 
A) CO 
B) CH 3Cl 
C) CH 4 
D) C 2H 5OH 
E) HCl

Question 15

In a redox reaction, electrons are transferred

Accepted Answer

A) from the substance being oxidized to the reducing agent. 
B) from the oxidizing agent to the reducing agent. 
C) from the substance being reduced to the oxidizing agent. 
D) from the substance being oxidized to the substance being reduced. 
E) from the substance being reduced to the substance being oxidized. 
A) from the substance being oxidized to the reducing agent. 
B) from the oxidizing agent to the reducing agent. 
C) from the substance being reduced to the oxidizing agent. 
D) from the substance being oxidized to the substance being reduced. 
E) from the substance being reduced to the substance being oxidized.

Question 16

In the following reaction, what ions, if any, are spectator ions? Pb(NO3)2(aq) + 2NaCl(aq) → PbCl2(s) + 2NaNO3(aq)

Accepted Answer

A) Pb 2+( aq), Cl −( aq) 
B) Na +( aq), NO 3 −( aq) 
C) Pb 2+( aq), NO 3 −( aq) 
D) Na +( aq), Cl −( aq) 
E) There are no spectator ions. 
A) Pb 2+( aq), Cl −( aq) 
B) Na +( aq), NO 3 −( aq) 
C) Pb 2+( aq), NO 3 −( aq) 
D) Na +( aq), Cl −( aq) 
E) There are no spectator ions.

Question 17

Select the net ionic equation for the reaction between sodium chloride and mercury(I) nitrate. 2NaCl(aq) + Hg2(NO3)2(aq) → 2NaNO3(aq) + Hg2Cl2(s)

Accepted Answer

A) Na +( aq)+ NO 3 −( aq)→ NaNO 3( aq) 
B) Hg 2 2+( aq)+ 2Cl −( aq)→ Hg 2Cl 2(s) 
C) NaCl( aq)→ Na +( aq)+ Cl −( aq) 
D) Hg 2(NO 3)2( aq)→ Hg 2 2+( aq)+ 2NO 3 −( aq) 
E) Hg 2 2+( aq)→ Hg 2( s) 
A) Na +( aq)+ NO 3 −( aq)→ NaNO 3( aq) 
B) Hg 2 2+( aq)+ 2Cl −( aq)→ Hg 2Cl 2(s) 
C) NaCl( aq)→ Na +( aq)+ Cl −( aq) 
D) Hg 2(NO 3)2( aq)→ Hg 2 2+( aq)+ 2NO 3 −( aq) 
E) Hg 2 2+( aq)→ Hg 2( s)

Question 18

Select the classification for the following reaction. 2H2O2(aq) → 2H2O(l) + O2(g)

Accepted Answer

A) Combination 
B) Decomposition 
C) Displacement 
D) Acid-base 
E) None of these choices are correct. 
A) Combination 
B) Decomposition 
C) Displacement 
D) Acid-base 
E) None of these choices are correct.

Question 19

A combination reaction may also be a displacement reaction.

Accepted Answer

A) True 
 B)False

Question 20

All combustion reactions are classified as combination reactions.

Accepted Answer

A) True 
 B)False

Exam 4: Three Major Classes of Chemical Reactions

Select the classification for the following reaction. Fe(s) + 2Fe3+(aq) → 3Fe2+(aq)

Which of the statements below correctly describes the combustion of glucose, shown below? C6H12O6 + 6O2 → 6CO2 + 6H2O

Which one of the following substances is a strong acid?

How many sodium ions are present in 325 mL of 0.850 M Na2SO4?

The compound P4O10 is used in refining sugar. Select the classification for the reaction in which it is synthesized. P4(s) + 5O2(g) → P4O10(s)

A base

Calculate the oxidation number of sulfur in sodium metabisulfite, Na2S2O5.

Select the classification for the following reaction. 2I−(aq) + Cl2(aq) → I2(aq) + 2Cl −(aq)

Select the classification for the following reaction. 2Ag+(aq) + Zn(s) → 2Ag(s) + Zn2+(aq)

Which of the following solutions will be the best conductor of electrical current?

Oxidation is associated with an increase in oxidation number.

Covalent compounds, dissolved in water, never produce conducting solutions.

What will be the final volume of a solution prepared by diluting 25 mL of 8.25 M sodium hydroxide to a concentration of 2.40 M?

Which one of the following substances is the best electrolyte?

In a redox reaction, electrons are transferred

In the following reaction, what ions, if any, are spectator ions? Pb(NO3)2(aq) + 2NaCl(aq) → PbCl2(s) + 2NaNO3(aq)

Select the net ionic equation for the reaction between sodium chloride and mercury(I) nitrate. 2NaCl(aq) + Hg2(NO3)2(aq) → 2NaNO3(aq) + Hg2Cl2(s)

Select the classification for the following reaction. 2H2O2(aq) → 2H2O(l) + O2(g)

A combination reaction may also be a displacement reaction.

All combustion reactions are classified as combination reactions.

Keys to the Study of Chemistry: Definitions, Units, and Problem Solving

The Components of Matter

Stoichiometry of Formulas and Equations

Gases and the Kinetic-Molecular Theory

Thermochemistry: Energy Flow and Chemical Change

Quantum Theory and Atomic Structure

Electron Configuration and Chemical Periodicity

Models of Chemical Bonding

The Shapes of Molecules

Theories of Covalent Bonding

Intermolecular Forces: Liquids, Solids, and Phase Changes

The Properties of Mixtures: Solutions and Colloids

Periodic Patterns in the Main-Group Elements

Organic Compounds and the Atomic Properties of Carbon

Kinetics: Rates and Mechanisms of Chemical Reactions

Equilibrium: the Extent of Chemical Reactions

Acid-Base Equilibria

Ionic Equilibria in Aqueous Systems

Thermodynamics: Entropy, Free Energy, and Reaction Direction

Electrochemistry: Chemical Change and Electrical Work

The Elements in Nature and Industry

Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

Select the classification for the following reaction. Fe(s) + 2Fe³⁺(aq) → 3Fe²⁺(aq)

Which of the statements below correctly describes the combustion of glucose, shown below? C₆H₁₂O₆ + 6O₂ → 6CO₂ + 6H₂O

How many sodium ions are present in 325 mL of 0.850 M Na₂SO₄?

The compound P₄O₁₀is used in refining sugar. Select the classification for the reaction in which it is synthesized. P₄(s) + 5O₂(g) → P₄O₁₀(s)

Calculate the oxidation number of sulfur in sodium metabisulfite, Na₂S₂O₅.

Select the classification for the following reaction. 2I⁻(aq) + Cl₂(aq) → I₂(aq) + 2Cl ⁻(aq)

Select the classification for the following reaction. 2Ag⁺(aq) + Zn(s) → 2Ag(s) + Zn²⁺(aq)

In the following reaction, what ions, if any, are spectator ions? Pb(NO₃)₂(aq) + 2NaCl(aq) → PbCl₂(s) + 2NaNO₃(aq)

Select the net ionic equation for the reaction between sodium chloride and mercury(I) nitrate. 2NaCl(aq) + Hg₂(NO₃)₂(aq) → 2NaNO₃(aq) + Hg₂Cl₂(s)

Select the classification for the following reaction. 2H₂O₂(aq) → 2H₂O(l) + O₂(g)