Question 1

Select the best statement relating to the following reaction: 2MnO2(s) + KClO3(aq) + 2KOH(aq) $\rightarrow$ 2KMnO4(aq) + KCl(aq) + H2O(l)

Accepted Answer

A)  Mn in MnO2 is oxidized. 
B)  O in KClO3 is the oxidizing agent. 
C)  K in KClO3 is the reducing agent. 
D)  H in KOH is oxidized. 
E)  Cl in KClO3 is the reducing agent. 
A)  Mn in MnO2 is oxidized. 
B)  O in KClO3 is the oxidizing agent. 
C)  K in KClO3 is the reducing agent. 
D)  H in KOH is oxidized. 
E)  Cl in KClO3 is the reducing agent.

Question 2

Select the net ionic equation for the reaction between lithium hydroxide and hydrobromic acid. LiOH(aq) + HBr(aq) $\rightarrow$H2O(l) + LiBr(aq)

Accepted Answer

A)  LiOH(aq)$\rightarrow$Li+(aq) + OH¯(aq) 
B)  HBr(aq) $\rightarrow$H+(aq) + Br¯(aq) 
C)  H+(aq) + OH¯(aq) $\rightarrow$H2O(l) 
D)  Li+(aq) + Br¯(aq) $\rightarrow$ LiBr(aq) 
E)  Li+(aq) + OH¯(aq) + H+(aq) + Br¯(aq) $\rightarrow$ H2O(l) + LiBr(aq) 
A)  LiOH(aq)$\rightarrow$Li+(aq) + OH¯(aq) 
B)  HBr(aq) $\rightarrow$H+(aq) + Br¯(aq) 
C)  H+(aq) + OH¯(aq) $\rightarrow$H2O(l) 
D)  Li+(aq) + Br¯(aq) $\rightarrow$ LiBr(aq) 
E)  Li+(aq) + OH¯(aq) + H+(aq) + Br¯(aq) $\rightarrow$ H2O(l) + LiBr(aq)

Question 3

Identify the oxidizing agent in the following redox reaction. Hg2+(aq) + Cu(s) $\rightarrow$ Cu2+(aq) + Hg(l)

Accepted Answer

A)  Hg2+(aq) 
B)  Cu(s) 
C)  Cu2+(aq) 
D)  Hg(l) 
E)  Hg2+(aq) and Cu2+(aq) 
A)  Hg2+(aq) 
B)  Cu(s) 
C)  Cu2+(aq) 
D)  Hg(l) 
E)  Hg2+(aq) and Cu2+(aq)

Question 4

Select the classification for the following reaction: Fe(s) + 2Fe3+(aq) $\rightarrow$3Fe2+(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.

Question 5

Select the precipitate that forms when aqueous ammonium sulfide reacts with aqueous copper(II) nitrate.

Accepted Answer

A)  CuS 
B)  Cu2S 
C)  NH4NO3 
D)  NH4(NO3)2 
E)  CuSO4 
A)  CuS 
B)  Cu2S 
C)  NH4NO3 
D)  NH4(NO3)2 
E)  CuSO4

Question 6

An acid

Accepted Answer

A)  produces hydroxide ions when dissolved in water. 
B)  changes the color of phenolphthalein indicator from colorless to pink. 
C)  donates electrons in an electron transfer reaction. 
D)  donates protons in a proton transfer reaction. 
E)  does none of these choices. 
A)  produces hydroxide ions when dissolved in water. 
B)  changes the color of phenolphthalein indicator from colorless to pink. 
C)  donates electrons in an electron transfer reaction. 
D)  donates protons in a proton transfer reaction. 
E)  does none of these choices.

Question 7

Which one of the following ionic compounds is soluble in water?

Accepted Answer

A)  Na2S 
B)  PbI2 
C)  AgCl 
D)  CuS 
E)  Ca3(PO4)2 
A)  Na2S 
B)  PbI2 
C)  AgCl 
D)  CuS 
E)  Ca3(PO4)2

Question 8

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

Accepted Answer

A)  1.66 * 1023 sodium ions 
B)  3.33 *1023 sodium ions 
C)  4.99 * 1023 sodium ions 
D)  6.20* 1023 sodium ions 
E)  1.57 *1024 sodium ions 
A)  1.66 * 1023 sodium ions 
B)  3.33 *1023 sodium ions 
C)  4.99 * 1023 sodium ions 
D)  6.20* 1023 sodium ions 
E)  1.57 *1024 sodium ions

Question 9

A particular reaction may be both a precipitation and an acid-base (neutralization) reaction.

Accepted Answer

A) True 
 B)False

Question 10

The compound P4O10 is used in refining sugar. Select the classification for the reaction in which it is synthesized. P4(s) + 5O2(g) $\rightarrow$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 11

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

Question 12

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

Accepted Answer

A)  methyl alcohol, CH3OH(aq) 
B)  glucose, C6H12O6(aq) 
C)  potassium chloride, KCl(aq) 
D)  bromine, Br2(aq) 
E)  ethylene glycol, C2H6O2(aq) 
A)  methyl alcohol, CH3OH(aq) 
B)  glucose, C6H12O6(aq) 
C)  potassium chloride, KCl(aq) 
D)  bromine, Br2(aq) 
E)  ethylene glycol, C2H6O2(aq)

Question 13

Which one of the following is not a redox reaction?

Accepted Answer

A)  2H2(g) + O2(g) $\rightarrow$ 2H2O(l) 
B)  Zn(s) + H2SO4(aq) $\rightarrow$ ZnSO4(aq) + H2(g) 
C)  H2O(l) + NH3(g) $\rightarrow$NH4+(aq) + OH¯(aq) 
D)  6FeSO4(aq) + K2Cr2O7(aq)+ 7H2SO4(aq) $\rightarrow$Cr2(SO4)3(aq) + 3Fe2(SO4)3(aq)+ K2SO4(aq) + 7H2O(l) 
E)  Cl2(g) + 2KBr(aq) $\rightarrow$ Br2(l) + 2KCl(aq) 
A)  2H2(g) + O2(g) $\rightarrow$ 2H2O(l) 
B)  Zn(s) + H2SO4(aq) $\rightarrow$ ZnSO4(aq) + H2(g) 
C)  H2O(l) + NH3(g) $\rightarrow$NH4+(aq) + OH¯(aq) 
D)  6FeSO4(aq) + K2Cr2O7(aq)+ 7H2SO4(aq) $\rightarrow$Cr2(SO4)3(aq) + 3Fe2(SO4)3(aq)+ K2SO4(aq) + 7H2O(l) 
E)  Cl2(g) + 2KBr(aq) $\rightarrow$ Br2(l) + 2KCl(aq)

Question 14

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 15

All combustion reactions are classified as combination reactions.

Accepted Answer

A) True 
 B)False

Question 16

Which one of the following substances, when dissolved in water at equal molar concentrations, will give the solution with the lowest electrical conductivity?

Accepted Answer

A)  CaCl2 
B)  HNO3 
C)  NH3 
D)  C6H12O6 (glucose) 
E)  CO2 
A)  CaCl2 
B)  HNO3 
C)  NH3 
D)  C6H12O6 (glucose) 
E)  CO2

Question 17

Select the correct name and chemical formula for the precipitate that forms when the following reactants are mixed. CoSO4(aq) + (NH4)3PO4(aq) $\rightarrow$

Accepted Answer

A)  cobalt(II) phosphate, Co3(PO4)2 
B)  cobalt(III) phosphate, Co3(PO4)2 
C)  cobalt(II) phosphate, CoPO4 
D)  cobalt(III) phosphate, CoPO4 
E)  ammonium sulfate, (NH4)2SO4 
A)  cobalt(II) phosphate, Co3(PO4)2 
B)  cobalt(III) phosphate, Co3(PO4)2 
C)  cobalt(II) phosphate, CoPO4 
D)  cobalt(III) phosphate, CoPO4 
E)  ammonium sulfate, (NH4)2SO4

Question 18

Predict the product(s) for the following reaction:

Accepted Answer

A)  HClO4(aq) 
B)  H2ClO4(aq) 
C)  H(ClO4)2(aq) 
D)  HCl(aq) + O2(g) 
E)  HClO3(aq) 
A)  HClO4(aq) 
B)  H2ClO4(aq) 
C)  H(ClO4)2(aq) 
D)  HCl(aq) + O2(g) 
E)  HClO3(aq)

Question 19

Calculate the oxidation number of the chlorine in perchloric acid, HClO4, a strong oxidizing agent.

Accepted Answer

A)  -1 
B)  +4 
C)  +5 
D)  +7 
E)  None of these choices is correct. 
A)  -1 
B)  +4 
C)  +5 
D)  +7 
E)  None of these choices is correct.

Question 20

In both of the following reactions, a precipitate is formed. Complete and balance the equations, showing the phases of the products. 
a. $ \mathrm{BaCl}_{2}(\alpha q)+\mathrm{Na}_{2} \mathrm{SO}_{4}(\alpha q) \rightarrow $
b. $ \mathrm{Mg}\left(\mathrm{NO}_{3}\right)_{2}(a q)+\mathrm{KOH}\left(a_{1}\right) \rightarrow $

Accepted Answer

The answer of In both of the following reactions, a...

Exam 4: Three Major Classes of Chemical Reactions

Select the best statement relating to the following reaction: 2MnO2(s) + KClO3(aq) + 2KOH(aq) →\rightarrow→ 2KMnO4(aq) + KCl(aq) + H2O(l)

Select the net ionic equation for the reaction between lithium hydroxide and hydrobromic acid. LiOH(aq) + HBr(aq) →\rightarrow→ H2O(l) + LiBr(aq)

Identify the oxidizing agent in the following redox reaction. Hg2+(aq) + Cu(s) →\rightarrow→ Cu2+(aq) + Hg(l)

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

Select the precipitate that forms when aqueous ammonium sulfide reacts with aqueous copper(II) nitrate.

An acid

Which one of the following ionic compounds is soluble in water?

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

A particular reaction may be both a precipitation and an acid-base (neutralization) reaction.

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

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

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

Which one of the following is not a redox reaction?

In a redox reaction, electrons are transferred

All combustion reactions are classified as combination reactions.

Which one of the following substances, when dissolved in water at equal molar concentrations, will give the solution with the lowest electrical conductivity?

Select the correct name and chemical formula for the precipitate that forms when the following reactants are mixed. CoSO4(aq) + (NH4)3PO4(aq) →\rightarrow→

Predict the product(s) for the following reaction:

Calculate the oxidation number of the chlorine in perchloric acid, HClO4, a strong oxidizing agent.

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 best statement relating to the following reaction: 2MnO₂(s) + KClO₃(aq) + 2KOH(aq) $\rightarrow$ 2KMnO₄(aq) + KCl(aq) + H₂O(l)

Select the net ionic equation for the reaction between lithium hydroxide and hydrobromic acid. LiOH(aq) + HBr(aq) $\rightarrow$ H₂O(l) + LiBr(aq)

Identify the oxidizing agent in the following redox reaction. Hg²⁺(aq) + Cu(s) $\rightarrow$ Cu²⁺(aq) + Hg(l)

Select the classification for the following reaction: Fe(s) + 2Fe³⁺(aq) $\rightarrow$ 3Fe²⁺(aq)

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) $\rightarrow$ P₄O₁₀(s)

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

Select the correct name and chemical formula for the precipitate that forms when the following reactants are mixed. CoSO₄(aq) + (NH₄)₃PO₄(aq) $\rightarrow$

Calculate the oxidation number of the chlorine in perchloric acid, HClO₄, a strong oxidizing agent.