Question 1

Identify the element being oxidized in the following reaction.
4Al + 3O2 → 2Al2O3

Accepted Answer

Question 2

Which of the following is a strong acid?

Accepted Answer

A)  H3PO4 
B)  HNO3 
C)  HF 
D)  CH3COOH 
E)  H2O 
A)  H3PO4 
B)  HNO3 
C)  HF 
D)  CH3COOH 
E)  H2O

Question 3

Based on the solubility rules, which one of these compounds is soluble in water?

Accepted Answer

A)  AgBr 
B)  AgCl 
C)  Ag2CO3 
D)  AgNO3 
E)  Ag2S 
A)  AgBr 
B)  AgCl 
C)  Ag2CO3 
D)  AgNO3 
E)  Ag2S

Question 4

In each of the following cases, write down the oxidation number of the indicated atom.
a. P in P4
b. C in C2H6
c. S in H2SO4
d. Mn in MnO4-
e. P in Na3PO4

Accepted Answer

a = 0, b =

Question 5

Complete the following reaction and identify the Brønsted acid. NaOH(aq) + HCl(aq) →

Accepted Answer

A)  NaH(aq) + HOCl(aq); NaOH is the acid. 
B)  NaH(aq) + HOCl(aq); HCl is the acid. 
C)  NaCl(aq) + H2O(l); NaOH is the acid. 
D)  NaCl(aq) + H2O(l); HCl is the acid. 
E)  NaCl(aq) + H2O(l); NaCl is the acid. 
A)  NaH(aq) + HOCl(aq); NaOH is the acid. 
B)  NaH(aq) + HOCl(aq); HCl is the acid. 
C)  NaCl(aq) + H2O(l); NaOH is the acid. 
D)  NaCl(aq) + H2O(l); HCl is the acid. 
E)  NaCl(aq) + H2O(l); NaCl is the acid.

Question 6

Which chemical equation describes a combustion reaction?

Accepted Answer

A)  2C2H6(g) + 7O2(g) → 4CO2(g) + 6H2O(l) 
B)  LiOH(aq) + HNO3(aq) → LiNO3(aq) + H2O(l) 
C)  N2(g) + 3H2(g) → 2NH3(g) 
D)  2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g) 
E)  2Al(s) + 3H2SO4(aq) → Al2(SO4)3(aq) + 3H2(g) 
A)  2C2H6(g) + 7O2(g) → 4CO2(g) + 6H2O(l) 
B)  LiOH(aq) + HNO3(aq) → LiNO3(aq) + H2O(l) 
C)  N2(g) + 3H2(g) → 2NH3(g) 
D)  2Na(s) + 2H2O(l) → 2NaOH(aq) + H2(g) 
E)  2Al(s) + 3H2SO4(aq) → Al2(SO4)3(aq) + 3H2(g)

Question 7

What is the pH of a 0.056 M HNO3 solution?

Accepted Answer

A)  0.056 
B)  1.25 
C)  12.75 
D)  2.88 
E)  11.11 
A)  0.056 
B)  1.25 
C)  12.75 
D)  2.88 
E)  11.11

Question 8

What mass of lithium phosphate is needed to prepare 500. mL of a solution having a lithium ion concentration of 0.125 M?

Accepted Answer

A)  2.41 g 
B)  7.24 g 
C)  14.5 g 
D)  21.7 g 
E)  43.4 g 
A)  2.41 g 
B)  7.24 g 
C)  14.5 g 
D)  21.7 g 
E)  43.4 g

Question 9

What is reduced in the following reaction? Cu(NO3)2 + Zn → Zn(NO3)2 + Cu

Accepted Answer

A)  Cu(NO3)2 
B)  N 
C)  O 
D)  Zn 
E)  NO3 
A)  Cu(NO3)2 
B)  N 
C)  O 
D)  Zn 
E)  NO3

Question 10

What is the net ionic equation if sodium sulfate is mixed with barium hydroxide?

Accepted Answer

A)  2Na+(aq) + SO42-(aq) → Na2SO4(s) 
B)  Na+(aq) + OH-(aq) → NaOH(s) 
C)  2Ba+(aq) + SO42- (aq) → Ba2SO4(s) 
D)  Ba2+(aq) + SO42- (aq) → BaSO4(s) 
E)  Ba2+(aq) + 2OH-(aq) → Ba(OH)2(s) 
A)  2Na+(aq) + SO42-(aq) → Na2SO4(s) 
B)  Na+(aq) + OH-(aq) → NaOH(s) 
C)  2Ba+(aq) + SO42- (aq) → Ba2SO4(s) 
D)  Ba2+(aq) + SO42- (aq) → BaSO4(s) 
E)  Ba2+(aq) + 2OH-(aq) → Ba(OH)2(s)

Question 11

Suppose a large piece of a metallic solid, A(s), is placed in a beaker containing the metallic cation Z2+(aq), as depicted below.   If Z is a more active metal than A, which is a possible representation of the final reaction mixture?

Accepted Answer

A)  I only 
B)  II only 
C)  III only 
D)  I or II 
E)  II or III 
A)  I only 
B)  II only 
C)  III only 
D)  I or II 
E)  II or III

Question 12

For the reaction depicted below, if Z represents Zn, which metal could A represent?

Accepted Answer

A)  Al 
B)  Na 
C)  Pb 
D)  Ca 
E)  Cu 
A)  Al 
B)  Na 
C)  Pb 
D)  Ca 
E)  Cu

Question 13

What is the oxidation number of N in K3Fe(CN)6?

Accepted Answer

A)  +3 
B)  -3 
C)  +4 
D)  -5 
E)  +1 
A)  +3 
B)  -3 
C)  +4 
D)  -5 
E)  +1

Question 14

What is the oxidizing agent in the following reaction? 5Fe2+(aq) + MnO4-(aq) + 8H+(aq) → 5Fe3+(aq) + Mn2+(aq) + 4H2O(l)

Accepted Answer

A)  Fe2+ 
B)  MnO4- 
C)  H+ 
D)  Mn2+ 
E)  Fe3+ 
A)  Fe2+ 
B)  MnO4- 
C)  H+ 
D)  Mn2+ 
E)  Fe3+

Question 15

A standard solution of 0.243 M NaOH was used to determine the concentration of a hydrochloric acid solution. If 46.33 mL of NaOH is needed to neutralize 10.00 mL of the acid, what is the molar concentration of the acid in the original solution?

Accepted Answer

A)  0.243 M 
B)  0.200 M 
C)  1.13 M 
D)  0.563 M 
E)  0.0313 M 
A)  0.243 M 
B)  0.200 M 
C)  1.13 M 
D)  0.563 M 
E)  0.0313 M

Question 16

Which represents the result of mixing equal volumes of 1 M aluminum chloride, 2 M magnesium chloride, and 1 M potassium chloride solution? (Each sphere represents 1 mol of ions.)

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 17

Which chemical equation describes an acid-base neutralization reaction?

Accepted Answer

A)  2Al(s)+ 3H2SO4(aq) → Al2 (SO4)3 (aq) + 3H2(g) 
B)  2SO2(g) + 2H2O(l) + O2(g) → 2H2SO4(aq) 
C)  LiOH(aq) + HNO3(aq) → LiNO3(aq) + H2O(l) 
D)  2KBr(aq) + Cl2(g) → 2KCl(aq) + Br2(aq) 
E)  CaBr2(aq) + H2SO4(aq) → CaSO4(s) + 2HBr(aq) 
A)  2Al(s)+ 3H2SO4(aq) → Al2 (SO4)3 (aq) + 3H2(g) 
B)  2SO2(g) + 2H2O(l) + O2(g) → 2H2SO4(aq) 
C)  LiOH(aq) + HNO3(aq) → LiNO3(aq) + H2O(l) 
D)  2KBr(aq) + Cl2(g) → 2KCl(aq) + Br2(aq) 
E)  CaBr2(aq) + H2SO4(aq) → CaSO4(s) + 2HBr(aq)

Question 18

Which element is reduced in the following reaction? Cu + 2H2SO4 → CuSO4 + SO2 + 2H2O

Accepted Answer

A)  Cu 
B)  H 
C)  S 
D)  O 
E)  H2O 
A)  Cu 
B)  H 
C)  S 
D)  O 
E)  H2O

Question 19

Which of the following is insoluble in water?

Accepted Answer

A)  Li2CO3 
B)  NaOH 
C)  PbCl2 
D)  Ba(OH)2 
E)  (NH4)2S 
A)  Li2CO3 
B)  NaOH 
C)  PbCl2 
D)  Ba(OH)2 
E)  (NH4)2S

Question 20

35.0 mL of 0.255 M nitric acid is added to 45.0 mL of 0.328 M Mg(NO3)2. What is the concentration of nitrate ion in the final solution?

Accepted Answer

A)  0.296 M 
B)  0.481 M 
C)  0.583 M 
D)  0.911 M 
E)  0.148 M 
A)  0.296 M 
B)  0.481 M 
C)  0.583 M 
D)  0.911 M 
E)  0.148 M

Exam 4: Reactions in Aqueous Solutions

Identify the element being oxidized in the following reaction. 4Al + 3O2 → 2Al2O3

Which of the following is a strong acid?

Based on the solubility rules, which one of these compounds is soluble in water?

In each of the following cases, write down the oxidation number of the indicated atom. a. P in P4 b. C in C2H6 c. S in H2SO4 d. Mn in MnO4- e. P in Na3PO4

Complete the following reaction and identify the Brønsted acid. NaOH(aq) + HCl(aq) →

Which chemical equation describes a combustion reaction?

What is the pH of a 0.056 M HNO3 solution?

What mass of lithium phosphate is needed to prepare 500. mL of a solution having a lithium ion concentration of 0.125 M?

What is reduced in the following reaction? Cu(NO3)2 + Zn → Zn(NO3)2 + Cu

What is the net ionic equation if sodium sulfate is mixed with barium hydroxide?

Suppose a large piece of a metallic solid, A(s), is placed in a beaker containing the metallic cation Z2+(aq), as depicted below. If Z is a more active metal than A, which is a possible representation of the final reaction mixture?

For the reaction depicted below, if Z represents Zn, which metal could A represent?

What is the oxidation number of N in K3Fe(CN)6?

What is the oxidizing agent in the following reaction? 5Fe2+(aq) + MnO4-(aq) + 8H+(aq) → 5Fe3+(aq) + Mn2+(aq) + 4H2O(l)

A standard solution of 0.243 M NaOH was used to determine the concentration of a hydrochloric acid solution. If 46.33 mL of NaOH is needed to neutralize 10.00 mL of the acid, what is the molar concentration of the acid in the original solution?

Which represents the result of mixing equal volumes of 1 M aluminum chloride, 2 M magnesium chloride, and 1 M potassium chloride solution? (Each sphere represents 1 mol of ions.)

Which chemical equation describes an acid-base neutralization reaction?

Which element is reduced in the following reaction? Cu + 2H2SO4 → CuSO4 + SO2 + 2H2O

Which of the following is insoluble in water?

35.0 mL of 0.255 M nitric acid is added to 45.0 mL of 0.328 M Mg(NO3)2. What is the concentration of nitrate ion in the final solution?

Chemistry: the Central Science

Atoms, Molecules, and Ions

Stoichiometry: Ratios of Combination

Thermochemistry

Quantum Theory and the Electronic Structure of Atoms

Electron Configuration and the Periodic Table

Chemical Bonding I: Basic Concepts

Chemical Bonding II: Molecular Geometry and Bonding Theories

Gases

Intermolecular Forces and the Physical Properties of Liquids and Solids

Modern Materials

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Entropy, Free Energy, and Equilibrium

Electrochemistry

Nuclear Chemistry

Environmental Chemistry

Coordination Chemistry

Metallurgy and the Chemistry of Metals

Nonmetallic Elements and Their Compounds

Organic Chemistry

Filters

Identify the element being oxidized in the following reaction. 4Al + 3O₂→ 2Al₂O₃

In each of the following cases, write down the oxidation number of the indicated atom. a. P in P₄ b. C in C₂H₆ c. S in H₂SO₄ d. Mn in MnO₄^- e. P in Na₃PO₄

What is the pH of a 0.056 M HNO₃ solution?

What is reduced in the following reaction? Cu(NO₃)₂ + Zn → Zn(NO₃)₂ + Cu

Suppose a large piece of a metallic solid, A(s), is placed in a beaker containing the metallic cation Z²⁺(aq), as depicted below. If Z is a more active metal than A, which is a possible representation of the final reaction mixture?

What is the oxidation number of N in K₃Fe(CN)₆?

What is the oxidizing agent in the following reaction? 5Fe²⁺(aq) + MnO₄^-(aq) + 8H⁺(aq) → 5Fe³⁺(aq) + Mn²⁺(aq) + 4H₂O(l)

Which element is reduced in the following reaction? Cu + 2H₂SO₄→ CuSO₄ + SO₂ + 2H₂O

35.0 mL of 0.255 M nitric acid is added to 45.0 mL of 0.328 M Mg(NO₃)₂. What is the concentration of nitrate ion in the final solution?