Question 1

Select the classification for the following reaction: KOH(aq) + HCl(aq) $\rightarrow$ KCl(aq) + H2O(l)

Accepted Answer

A)  precipitation 
B)  acid-base 
C)  redox 
D)  combination 
E)  None of these choices is correct. 
A)  precipitation 
B)  acid-base 
C)  redox 
D)  combination 
E)  None of these choices is correct.

Question 2

Sodium thiosulfate, Na2S2O3, is used as a "fixer" in black and white photography. Identify the reducing agent in the reaction of thiosulfate with iodine. 2S2O32¯(aq) + I2(aq) $\rightarrow$S4O62¯(aq) + 2I¯(aq)

Accepted Answer

A)  I2(aq) 
B)  I¯(aq) 
C)  S2O32¯(aq) 
D)  S4O62¯(aq) 
E)  S2O32¯(aq) and I¯(aq) 
A)  I2(aq) 
B)  I¯(aq) 
C)  S2O32¯(aq) 
D)  S4O62¯(aq) 
E)  S2O32¯(aq) and I¯(aq)

Question 3

Balance the following redox equation using the smallest integers possible and select the correct coefficient for the bromide anion, Br¯. Br2(aq) + OH¯(aq) $\rightarrow$Br¯(aq) + BrO3¯(aq) + H2O(l)

Accepted Answer

A)  1 
B)  2 
C)  5 
D)  6 
E)  10 
A)  1 
B)  2 
C)  5 
D)  6 
E)  10

Question 4

Reduction is the loss of electrons.

Accepted Answer

A) True 
 B)False

Question 5

Predict the product(s) for the following reaction:

Accepted Answer

A)  MgO2(s) + CO(g) 
B)  MgO(s) + CO2 
C)  Mg(s) + CO2(g) + O2(g) 
D)  Mg2+(s) + CO2(g) + O2(g) 
E)  No reaction occurs. 
A)  MgO2(s) + CO(g) 
B)  MgO(s) + CO2 
C)  Mg(s) + CO2(g) + O2(g) 
D)  Mg2+(s) + CO2(g) + O2(g) 
E)  No reaction occurs.

Question 6

All acid-base reactions produce a salt and water as the only products.

Accepted Answer

A) True 
 B)False

Question 7

Automobile batteries use 3.0 M H2SO4 as an electrolyte. How much 1.20 M NaOH will be needed to neutralize 225 mL of battery acid? H2SO4(aq) + 2NaOH(aq) $\rightarrow$2H2O(l) + Na2SO4(aq)

Accepted Answer

A)  0.045 L 
B)  0.28 L 
C)  0.56 L 
D)  0.90 L 
E)  1.1 L 
A)  0.045 L 
B)  0.28 L 
C)  0.56 L 
D)  0.90 L 
E)  1.1 L

Question 8

A) Explain or define what is meant by the term "oxidation."
B) Write down the oxidation numbers of all the atoms in the formulas K2Cr2O7 and NaH.

Accepted Answer

a. Oxidation: loss of electron

Question 9

Which one of the following is a redox reaction?

Accepted Answer

A)  2Na(g) + Cl2(g) $\rightarrow$ 2NaCl(s) 
B)  Ba2+(aq) + SO42¯(aq) $\rightarrow$ BaSO4(s) 
C)  K2Cr2O7(aq) + 2KOH(aq) $\rightarrow$2K2CrO4(aq) + H2O(l) 
D)  Na2CO3(s) + 2HCl(aq) $\rightarrow$ 2NaCl(aq) + CO2(g) + H2O(l) 
E)  H2O(l) $\rightarrow$H+(aq) + OH¯(aq) 
A)  2Na(g) + Cl2(g) $\rightarrow$ 2NaCl(s) 
B)  Ba2+(aq) + SO42¯(aq) $\rightarrow$ BaSO4(s) 
C)  K2Cr2O7(aq) + 2KOH(aq) $\rightarrow$2K2CrO4(aq) + H2O(l) 
D)  Na2CO3(s) + 2HCl(aq) $\rightarrow$ 2NaCl(aq) + CO2(g) + H2O(l) 
E)  H2O(l) $\rightarrow$H+(aq) + OH¯(aq)

Question 10

Potassium chloride, KCl, sodium sulfate, Na2SO4, glucose, C6H12O6, carbon dioxide, CO2 and ammonium phosphate, (NH4)3PO4, are soluble in water. Which one produces the largest number of dissolved particles per mole of dissolved solute?

Accepted Answer

A)  KCl 
B)  Na2SO4 
C)  C6H12O6 
D)  CO2 
E)  (NH4)3PO4 
A)  KCl 
B)  Na2SO4 
C)  C6H12O6 
D)  CO2 
E)  (NH4)3PO4

Question 11

What, if any, are the spectator ions when aqueous solutions of HBr and RbOH neutralize each other?

Accepted Answer

A)  H+ and OH¯ 
B)  H+ and Rb+ 
C)  Rb+ and Br¯ 
D)  Br¯ and OH¯ 
E)  There are no spectator ions in this reaction. 
A)  H+ and OH¯ 
B)  H+ and Rb+ 
C)  Rb+ and Br¯ 
D)  Br¯ and OH¯ 
E)  There are no spectator ions in this reaction.

Question 12

Select the classification for the following reaction:

Accepted Answer

A)  acid-base 
B)  precipitation 
C)  combination 
D)  displacement 
E)  decomposition 
A)  acid-base 
B)  precipitation 
C)  combination 
D)  displacement 
E)  decomposition

Question 13

Balance the following redox equation using the smallest integers possible and select the correct coefficient for the iron(II) hydroxide, Fe(OH)2. Fe(OH)2(s) + CrO42¯(aq) $\rightarrow$Fe2O3(s) + Cr(OH)4¯(aq) + H2O(l) + OH¯(aq)

Accepted Answer

A)  1 
B)  2 
C)  3 
D)  4 
E)  6 
A)  1 
B)  2 
C)  3 
D)  4 
E)  6

Question 14

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)  does none of these choices. 
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)  does none of these choices.

Question 15

Select the classification for the following reaction: 2H2O2(aq) $\rightarrow$ 2H2O(l) + O2(g)

Accepted Answer

A)  combination 
B)  decomposition 
C)  displacement 
D)  acid-base 
E)  None of these choices is correct. 
A)  combination 
B)  decomposition 
C)  displacement 
D)  acid-base 
E)  None of these choices is correct.

Question 16

Select the classification for the following reaction: Na2O(s) + H2O(l) $\rightarrow$ 2NaOH(aq)

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 17

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

Accepted Answer

A)  Pb2+(aq), Cl¯(aq) 
B)  Na+(aq), NO3¯(aq) 
C)  Pb2+(aq), NO3¯(aq) 
D)  Na+(aq), Cl¯(aq) 
E)  There are no spectator ions in this reaction. 
A)  Pb2+(aq), Cl¯(aq) 
B)  Na+(aq), NO3¯(aq) 
C)  Pb2+(aq), NO3¯(aq) 
D)  Na+(aq), Cl¯(aq) 
E)  There are no spectator ions in this reaction.

Question 18

An aqueous solution of lead nitrate, Pb(NO3)2, is mixed with one of sodium chromate, Na2CrO4, resulting in the formation of a precipitate of lead chromate. Write a balanced net ionic equation for this precipitation reaction, showing all phases.

Accepted Answer

Question 19

In an acid-base (neutralization) reaction the indicator will change color at the end point.

Accepted Answer

A) True 
 B)False

Question 20

Select the classification for the following reaction: BaCl2(aq) + K2SO4(aq) $\rightarrow$ BaSO4(s) + 2KCl(aq)

Accepted Answer

A)  precipitation 
B)  acid-base 
C)  redox 
D)  decomposition 
E)  None of these choices is correct. 
A)  precipitation 
B)  acid-base 
C)  redox 
D)  decomposition 
E)  None of these choices is correct.

Exam 4: Three Major Classes of Chemical Reactions

Select the classification for the following reaction: KOH(aq) + HCl(aq) →\rightarrow→ KCl(aq) + H2O(l)

Sodium thiosulfate, Na2S2O3, is used as a "fixer" in black and white photography. Identify the reducing agent in the reaction of thiosulfate with iodine. 2S2O32¯(aq) + I2(aq) →\rightarrow→ S4O62¯(aq) + 2I¯(aq)

Balance the following redox equation using the smallest integers possible and select the correct coefficient for the bromide anion, Br¯. Br2(aq) + OH¯(aq) →\rightarrow→ Br¯(aq) + BrO3¯(aq) + H2O(l)

Reduction is the loss of electrons.

Predict the product(s) for the following reaction:

All acid-base reactions produce a salt and water as the only products.

Automobile batteries use 3.0 M H2SO4 as an electrolyte. How much 1.20 M NaOH will be needed to neutralize 225 mL of battery acid? H2SO4(aq) + 2NaOH(aq) →\rightarrow→ 2H2O(l) + Na2SO4(aq)

A) Explain or define what is meant by the term "oxidation." B) Write down the oxidation numbers of all the atoms in the formulas K2Cr2O7 and NaH.

Which one of the following is a redox reaction?

Potassium chloride, KCl, sodium sulfate, Na2SO4, glucose, C6H12O6, carbon dioxide, CO2 and ammonium phosphate, (NH4)3PO4, are soluble in water. Which one produces the largest number of dissolved particles per mole of dissolved solute?

What, if any, are the spectator ions when aqueous solutions of HBr and RbOH neutralize each other?

Select the classification for the following reaction:

Balance the following redox equation using the smallest integers possible and select the correct coefficient for the iron(II) hydroxide, Fe(OH)2. Fe(OH)2(s) + CrO42¯(aq) →\rightarrow→ Fe2O3(s) + Cr(OH)4¯(aq) + H2O(l) + OH¯(aq)

A base

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

Select the classification for the following reaction: Na2O(s) + H2O(l) →\rightarrow→ 2NaOH(aq)

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

An aqueous solution of lead nitrate, Pb(NO3)2, is mixed with one of sodium chromate, Na2CrO4, resulting in the formation of a precipitate of lead chromate. Write a balanced net ionic equation for this precipitation reaction, showing all phases.

In an acid-base (neutralization) reaction the indicator will change color at the end point.

Select the classification for the following reaction: BaCl2(aq) + K2SO4(aq) →\rightarrow→ BaSO4(s) + 2KCl(aq)

Keys to the Study of Chemistry

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 the Direction of Chemical Reactions

Electrochemistry: Chemical Change and Electrical Work

The Elements in Nature and Industry

The Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

Select the classification for the following reaction: KOH(aq) + HCl(aq) $\rightarrow$ KCl(aq) + H₂O(l)

Sodium thiosulfate, Na₂S₂O₃, is used as a "fixer" in black and white photography. Identify the reducing agent in the reaction of thiosulfate with iodine. 2S₂O₃^2¯(aq) + I₂(aq) $\rightarrow$ S₄O₆^2¯(aq) + 2I^¯(aq)

Balance the following redox equation using the smallest integers possible and select the correct coefficient for the bromide anion, Br^¯. Br₂(aq) + OH^¯(aq) $\rightarrow$ Br^¯(aq) + BrO₃^¯(aq) + H₂O(l)

Automobile batteries use 3.0 M H₂SO₄ as an electrolyte. How much 1.20 M NaOH will be needed to neutralize 225 mL of battery acid? H₂SO₄(aq) + 2NaOH(aq) $\rightarrow$ 2H₂O(l) + Na₂SO₄(aq)

A) Explain or define what is meant by the term "oxidation." B) Write down the oxidation numbers of all the atoms in the formulas K₂Cr₂O₇ and NaH.

Potassium chloride, KCl, sodium sulfate, Na₂SO₄, glucose, C₆H₁₂O₆, carbon dioxide, CO₂ and ammonium phosphate, (NH₄)₃PO₄, are soluble in water. Which one produces the largest number of dissolved particles per mole of dissolved solute?

Balance the following redox equation using the smallest integers possible and select the correct coefficient for the iron(II) hydroxide, Fe(OH)₂. Fe(OH)₂(s) + CrO₄^2¯(aq) $\rightarrow$ Fe₂O₃(s) + Cr(OH)₄^¯(aq) + H₂O(l) + OH^¯(aq)

Select the classification for the following reaction: 2H₂O₂(aq) $\rightarrow$ 2H₂O(l) + O₂(g)

Select the classification for the following reaction: Na₂O(s) + H₂O(l) $\rightarrow$ 2NaOH(aq)

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

An aqueous solution of lead nitrate, Pb(NO₃)₂, is mixed with one of sodium chromate, Na₂CrO₄, resulting in the formation of a precipitate of lead chromate. Write a balanced net ionic equation for this precipitation reaction, showing all phases.

Select the classification for the following reaction: BaCl₂(aq) + K₂SO₄(aq) $\rightarrow$ BaSO₄(s) + 2KCl(aq)