Question 1

The oxidation numbers of P, S, and Cl in H2PO2-, H2S, and KClO4 are, respectively

Accepted Answer

A)  -1, -1, +3. 
B)  +1, -2, +7. 
C)  +1, +2, +7. 
D)  -1, -2, +7. 
E)  -1, -2, +3. 
A)  -1, -1, +3. 
B)  +1, -2, +7. 
C)  +1, +2, +7. 
D)  -1, -2, +7. 
E)  -1, -2, +3.

Question 2

Vinegar is a solution of acetic acid, CH3COOH, dissolved in water. A 5.54-g sample of vinegar was neutralized by 30.10 mL of 0.100 M NaOH. What is the percent by weight of acetic acid in the vinegar?

Accepted Answer

A)  0.184% 
B)  1.63% 
C)  3.26% 
D)  5.43% 
E)  9.23% 
A)  0.184% 
B)  1.63% 
C)  3.26% 
D)  5.43% 
E)  9.23%

Question 3

Which one of the following is a redox reaction?

Accepted Answer

A)  2Na(g) + Cl2(g) F1F1F1S1F1F1F10 2NaCl(s) 
B)  Ba2+(aq) + SO42-(aq) F1F1F1S1F1F1F10 BaSO4(s) 
C)  K2Cr2O7(aq) + 2KOH(aq) F1F1F1S1F1F1F10 2K2CrO4(aq) + H2O(l) 
D)  Na2CO3(s) + 2HCl(aq) F1F1F1S1F1F1F10 2NaCl(aq) + CO2(g) + H2O(l) 
E)  H2O(l) F1F1F1S1F1F1F10 H+(aq) + OH-(aq) 
A)  2Na(g) + Cl2(g) F1F1F1S1F1F1F10 2NaCl(s) 
B)  Ba2+(aq) + SO42-(aq) F1F1F1S1F1F1F10 BaSO4(s) 
C)  K2Cr2O7(aq) + 2KOH(aq) F1F1F1S1F1F1F10 2K2CrO4(aq) + H2O(l) 
D)  Na2CO3(s) + 2HCl(aq) F1F1F1S1F1F1F10 2NaCl(aq) + CO2(g) + H2O(l) 
E)  H2O(l) F1F1F1S1F1F1F10 H+(aq) + OH-(aq)

Question 4

The amount of calcium present in milk can be determined by adding oxalate to a sample and measuring the mass of calcium oxalate precipitated. What is the mass percent of calcium if 0.429 g of calcium oxalate forms in a 125-g sample of milk when excess aqueous sodium oxalate is added? Na2C2O4(aq) + Ca2+(aq) F1F1F1S1F1F1F10 CaC2O4(s) + 2Na+(aq)

Accepted Answer

A)  0.107% 
B)  0.202% 
C)  0.343% 
D)  1.10% 
E)  1.37% 
A)  0.107% 
B)  0.202% 
C)  0.343% 
D)  1.10% 
E)  1.37%

Question 5

Predict the product(s) for the following reaction. MgCO3(s)

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

a. Define "oxidation".
b. Identify the oxidizing and reducing agents in the following (unbalanced) equation.
HNO3(aq) + C2H6O(aq) + K2Cr2O7(aq) F1F1F1S1F1F1F10 KNO3(aq) + C2H4O(aq) + H2O(l) + Cr(NO3)3(aq)

Accepted Answer

a. Oxidation: loss of electron

Question 7

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 the above. 
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 the above.

Question 8

Predict the product(s) for the following reaction. H2SO4(aq) + KOH(aq) F1F1F1S1F1F1F10

Accepted Answer

A)  K2SO4(aq) + H2O(l) 
B)  K2S(aq) + H2O(l) 
C)  K(s) + H2(g) + SO3(g) 
D)  KSO4(aq) + H2O(l) 
E)  No reaction occurs. 
A)  K2SO4(aq) + H2O(l) 
B)  K2S(aq) + H2O(l) 
C)  K(s) + H2(g) + SO3(g) 
D)  KSO4(aq) + H2O(l) 
E)  No reaction occurs.

Question 9

Select the classification for the following reaction. KOH(aq) + HCl(aq) F1F1F1S1F1F1F10 KCl(aq) + H2O(l)

Accepted Answer

A)  precipitation 
B)  acid-base 
C)  redox 
D)  combination 
E)  none of the above 
A)  precipitation 
B)  acid-base 
C)  redox 
D)  combination 
E)  none of the above

Question 10

a. Explain or define what is meant by the term "oxidation."
b. Write down the oxidation numbers of all the atoms in the following formulas.
K2Cr2O7 NaH

Accepted Answer

a. Oxidation: loss o

Question 11

Identify all the spectator ions in the following reaction. 
2KMnO4(aq) + 10FeSO4(aq) + 8H2SO4(aq) F1F1F1S1F1F1F10 K2SO4(aq) + 2MnSO4(aq) + 5Fe2(SO4)3(aq) + 8H2O(l)

Accepted Answer

A)  only K+ 
B)  only SO42- 
C)  only K+ and SO42- 
D)  only K+, SO42-, and Fe2+ 
E)  only K+, SO42-, Fe2+, and Mn2+ 
A)  only K+ 
B)  only SO42- 
C)  only K+ and SO42- 
D)  only K+, SO42-, and Fe2+ 
E)  only K+, SO42-, Fe2+, and Mn2+

Question 12

In both of the following reactions, a precipitate is formed. Complete and balance the equations, showing the phases of the products.
a. AgNO3(aq) + CaCl2(aq) F1F1F1S1F1F1F10
b. NaOH(aq) + Fe(NO3)3(aq) F1F1F1S1F1F1F10

Accepted Answer

a. 2AgNO₃(aq) + CaCl₂(aq) F1F1F1

Question 13

What is the oxidation number of iodine in I2.

Accepted Answer

A)  -1 
B)  0 
C)  +1 
D)  +7 
E)  None of the above is the correct oxidation number. 
A)  -1 
B)  0 
C)  +1 
D)  +7 
E)  None of the above is the correct oxidation number.

Question 14

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 15

Identify the oxidizing agent in the following redox reaction. 
Hg2+(aq) + Cu(s) F1F1F1S1F1F1F10 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 16

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 17

The compound PS1U1B14S1U1B0OS1U1B110S1U1B0is used in refining sugar. Select the classification for the reaction in which it is synthesized. PS1U1B14S1U1B0(s) + 5OS1U1B12S1U1B0(g) $\rarr$PS1U1B14S1U1B0OS1U1B110S1U1B0(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 18

Select the classification for the following reaction. 2I-(aq) + Cl2(aq) F1F1F1S1F1F1F10 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 19

Which, if any, of the following properties applies to weak acids?

Accepted Answer

A)  They are strong electrolytes. 
B)  They are excellent conductors of electricity. 
C)  When dissolved in water, they do not ionize completely. 
D)  all of the above 
E)  none of the above 
A)  They are strong electrolytes. 
B)  They are excellent conductors of electricity. 
C)  When dissolved in water, they do not ionize completely. 
D)  all of the above 
E)  none of the above

Question 20

Sodium hydroxide, also known as caustic soda, is used to neutralize acids and to treat cellulose in making of cellophane. Calculate the number of moles of solute in 1.875 L of 1.356 M NaOH solution.

Accepted Answer

A)  2.543 mol 
B)  1.383 mol 
C)  0.7232 mol 
D)  0.3932 mol 
E)  0.001383 mol 
A)  2.543 mol 
B)  1.383 mol 
C)  0.7232 mol 
D)  0.3932 mol 
E)  0.001383 mol

Exam 4: The Major Classes of Chemical Reactions

The oxidation numbers of P, S, and Cl in H2PO2-, H2S, and KClO4 are, respectively

Vinegar is a solution of acetic acid, CH3COOH, dissolved in water. A 5.54-g sample of vinegar was neutralized by 30.10 mL of 0.100 M NaOH. What is the percent by weight of acetic acid in the vinegar?

Which one of the following is a redox reaction?

Predict the product(s) for the following reaction. MgCO3(s)

a. Define "oxidation". b. Identify the oxidizing and reducing agents in the following (unbalanced) equation. HNO3(aq) + C2H6O(aq) + K2Cr2O7(aq)  KNO3(aq) + C2H4O(aq) + H2O(l) + Cr(NO3)3(aq)

A base

Predict the product(s) for the following reaction. H2SO4(aq) + KOH(aq) 

Select the classification for the following reaction. KOH(aq) + HCl(aq)  KCl(aq) + H2O(l)

a. Explain or define what is meant by the term "oxidation." b. Write down the oxidation numbers of all the atoms in the following formulas. K2Cr2O7 NaH

Identify all the spectator ions in the following reaction. 2KMnO4(aq) + 10FeSO4(aq) + 8H2SO4(aq)  K2SO4(aq) + 2MnSO4(aq) + 5Fe2(SO4)3(aq) + 8H2O(l)

In both of the following reactions, a precipitate is formed. Complete and balance the equations, showing the phases of the products. a. AgNO3(aq) + CaCl2(aq)  b. NaOH(aq) + Fe(NO3)3(aq) 

What is the oxidation number of iodine in I2.

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?

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

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

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

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

Which, if any, of the following properties applies to weak acids?

Sodium hydroxide, also known as caustic soda, is used to neutralize acids and to treat cellulose in making of cellophane. Calculate the number of moles of solute in 1.875 L of 1.356 M NaOH solution.

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: Bonding, Structure, and Reactivity

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

The oxidation numbers of P, S, and Cl in H₂PO₂^-, H₂S, and KClO₄ are, respectively

Vinegar is a solution of acetic acid, CH₃COOH, dissolved in water. A 5.54-g sample of vinegar was neutralized by 30.10 mL of 0.100 M NaOH. What is the percent by weight of acetic acid in the vinegar?

Predict the product(s) for the following reaction. MgCO₃(s)

a. Define "oxidation". b. Identify the oxidizing and reducing agents in the following (unbalanced) equation. HNO₃(aq) + C₂H₆O(aq) + K₂Cr₂O₇(aq)  KNO₃(aq) + C₂H₄O(aq) + H₂O(l) + Cr(NO₃)₃(aq)

Predict the product(s) for the following reaction. H₂SO₄(aq) + KOH(aq) 

Select the classification for the following reaction. KOH(aq) + HCl(aq)  KCl(aq) + H₂O(l)

a. Explain or define what is meant by the term "oxidation." b. Write down the oxidation numbers of all the atoms in the following formulas. K₂Cr₂O₇NaH

Identify all the spectator ions in the following reaction. 2KMnO₄(aq) + 10FeSO₄(aq) + 8H₂SO₄(aq)  K₂SO₄(aq) + 2MnSO₄(aq) + 5Fe₂(SO₄)₃(aq) + 8H₂O(l)

In both of the following reactions, a precipitate is formed. Complete and balance the equations, showing the phases of the products. a. AgNO₃(aq) + CaCl₂(aq)  b. NaOH(aq) + Fe(NO₃)₃(aq) 

What is the oxidation number of iodine in I₂.

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

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

Select the classification for the following reaction. 2I^-(aq) + Cl₂(aq)  I₂(aq) + 2Cl ^-(aq)