Question 1

Define and illustrate with an example the difference between an electrolyte and a nonelectrolyte.

Accepted Answer

(Answers will vary.)An electrolyte is a

Question 2

Identify the oxidizing agent in the following reaction.
4Al + 3O2 $\rarr$2Al2O3

Accepted Answer

Question 3

One method of determining the concentration of hydrogen peroxide (H2O2)in a solution is through titration with iodide ion. The net ionic equation for this reaction is H2O2 + 2I- +2H+ $\rarr$ I2 + 2H2O
A 50.00 mL sample of a hydrogen peroxide solution is found to react completely with 37.12 mL of a 0.1500 M KI solution. What is the concentration of hydrogen peroxide in the sample?

Accepted Answer

A) 5.568 * 10-2 M 
B) 0.2227 M 
C) 0.1010 M 
D) 0.4041 M 
E) 0.1114 M 
A) 5.568 * 10-2 M 
B) 0.2227 M 
C) 0.1010 M 
D) 0.4041 M 
E) 0.1114 M

Question 4

The concentration of oxalate ion (C2O42-)in a sample can be determined by titration with a solution of permanganate ion (MnO4-)of known concentration. The net ionic equation for this reaction is 2MnO4- + 5C2O42- + 16H+ $\rarr$ 2Mn2+ + 8H2O + 10CO2
 A 30.00 mL sample of an oxalate solution is found to react completely with 21.93 mL of a 0.1725 M solution of MnO4-. What is the oxalate ion concentration in the sample?

Accepted Answer

A) 0.02914 M 
B) 0.4312 M 
C) 0.1821 M 
D) 0.3152 M 
E) 0.05044 M 
A) 0.02914 M 
B) 0.4312 M 
C) 0.1821 M 
D) 0.3152 M 
E) 0.05044 M

Question 5

Identify the major ions present in an aqueous HNO3 solution.

Accepted Answer

A) HN+, O2- 
B) OH-, NO3- 
C) OH-, NO 
D) H+, N3-, O2- 
E) H+, NO3- 
A) HN+, O2- 
B) OH-, NO3- 
C) OH-, NO 
D) H+, N3-, O2- 
E) H+, NO3-

Question 6

In the following chemical reaction the oxidizing agent is 5S + 6KNO3 + 2CaCO3 $\rarr$3K2SO4 + 2CaSO4 + CO2 + 3N2

Accepted Answer

A) S 
B) N2 
C) KNO3 
D) CaSO4 
E) CaCO3 
A) S 
B) N2 
C) KNO3 
D) CaSO4 
E) CaCO3

Question 7

The oxidation number of Cl in ClO3- is

Accepted Answer

A) -1 
B) +7 
C) +5 
D) +3 
E) None of the above. 
A) -1 
B) +7 
C) +5 
D) +3 
E) None of the above.

Question 8

Which of the following compounds is a weak electrolyte?

Accepted Answer

A) HCl 
B) CH3COOH (acetic acid) 
C) C6H12O6 (glucose) 
D) O2 
E) NaCl 
A) HCl 
B) CH3COOH (acetic acid) 
C) C6H12O6 (glucose) 
D) O2 
E) NaCl

Question 9

What mass of K2CO3 is needed to prepare 200.mL of a solution having a potassium ion concentration of 0.150 M?

Accepted Answer

A) 4.15 g 
B) 10.4 g 
C) 13.8 g 
D) 2.07 g 
E) 1.49 g 
A) 4.15 g 
B) 10.4 g 
C) 13.8 g 
D) 2.07 g 
E) 1.49 g

Question 10

Identify the major ionic species present in an aqueous solution of Na2CO3.

Accepted Answer

A) Na2+, CO32- 
B) Na2+, C2 -, O3 
C) Na+, C4+, O32- 
D) Na+, C+, O2- 
E) Na+, CO32- 
A) Na2+, CO32- 
B) Na2+, C2 -, O3 
C) Na+, C4+, O32- 
D) Na+, C+, O2- 
E) Na+, CO32-

Question 11

A piece of copper metal was added to an aqueous solution of silver nitrate, and within a few minutes it was observed that a grey crystalline solid formed on surface of the copper and the solution turned a blue color characteristic of copper(II)ions.
Write the net ionic equation for this reaction.

Accepted Answer

Cu(s)+ 2Ag

Question 12

What is the chemical formula of the salt produced by the neutralization of nitric acid with calcium hydroxide?

Accepted Answer

A) CaNO3 
B) Ca2(NO3)3 
C) Ca3(NO3)2 
D) Ca2NO3 
E) Ca(NO3)2 
A) CaNO3 
B) Ca2(NO3)3 
C) Ca3(NO3)2 
D) Ca2NO3 
E) Ca(NO3)2

Question 13

Which substance is acting as a Brønsted acid in the following reaction?
HSO4- + NH4+ $\rarr$H2SO4 + NH3

Accepted Answer

Question 14

Select the compound in which sulfur has its highest possible oxidation number.

Accepted Answer

A) H2S 
B) SO2 
C) SCl2 
D) H2SO3 
E) Na2SO4 
A) H2S 
B) SO2 
C) SCl2 
D) H2SO3 
E) Na2SO4

Question 15

Based on the solubility rules, which one of the following should be soluble in water?

Accepted Answer

A) CaSO4 
B) BaSO4 
C) PbSO4 
D) K2SO4 
E) AgCl 
A) CaSO4 
B) BaSO4 
C) PbSO4 
D) K2SO4 
E) AgCl

Question 16

Identify the element being reduced in the following reaction.
2KBr + F2 $\rarr$Br2 + 2KF

Accepted Answer

Question 17

During a titration the following data were collected.A 10.mL portion of an unknown monoprotic acid solution was titrated with 1.0 M NaOH; 40.mL of the base were required to neutralize the sample. What is the molarity of the acid solution?

Accepted Answer

The answer of During a titration the following data were...

Question 18

Which of the following is an example of a disproportionation reaction?

Accepted Answer

A) 2C2H6(g)+ 7O2(g)$\rarr$4CO2(g)+ 6H2O(l) 
B) 2KBr(aq)+ Cl2(g)$\rarr$2KCl(aq)+ Br2(l) 
C) 2H2O2(aq)$\rarr$ 2H2O(l)+ O2(g) 
D) CaBr2(aq)+ H2SO4(aq)$\rarr$CaSO4(s)+ 2HBr(g) 
E) 2Al(s)+ 3H2SO4(aq)$\rarr$Al2(SO4)3(aq)+ 3H2(g) 
A) 2C2H6(g)+ 7O2(g)$\rarr$4CO2(g)+ 6H2O(l) 
B) 2KBr(aq)+ Cl2(g)$\rarr$2KCl(aq)+ Br2(l) 
C) 2H2O2(aq)$\rarr$ 2H2O(l)+ O2(g) 
D) CaBr2(aq)+ H2SO4(aq)$\rarr$CaSO4(s)+ 2HBr(g) 
E) 2Al(s)+ 3H2SO4(aq)$\rarr$Al2(SO4)3(aq)+ 3H2(g)

Question 19

The oxidation number of N in NO is +7.

Accepted Answer

A) True 
 B)False

Question 20

Identify the major ionic species present in an aqueous solution of K2SO4.

Accepted Answer

A) K2+, S6+, O48- 
B) K2+, S6+, 4O2- 
C) 2K+, S6+, O48- 
D) 2K+, S6+, 4O2- 
E) 2K+, SO42- 
A) K2+, S6+, O48- 
B) K2+, S6+, 4O2- 
C) 2K+, S6+, O48- 
D) 2K+, S6+, 4O2- 
E) 2K+, SO42-

Exam 4: Reactions in Aqueous Solution

Define and illustrate with an example the difference between an electrolyte and a nonelectrolyte.

Identify the oxidizing agent in the following reaction. 4Al + 3O2 →\rarr→ 2Al2O3

Identify the major ions present in an aqueous HNO3 solution.

In the following chemical reaction the oxidizing agent is 5S + 6KNO3 + 2CaCO3 →\rarr→ 3K2SO4 + 2CaSO4 + CO2 + 3N2

The oxidation number of Cl in ClO3- is

Which of the following compounds is a weak electrolyte?

What mass of K2CO3 is needed to prepare 200.mL of a solution having a potassium ion concentration of 0.150 M?

Identify the major ionic species present in an aqueous solution of Na2CO3.

A piece of copper metal was added to an aqueous solution of silver nitrate, and within a few minutes it was observed that a grey crystalline solid formed on surface of the copper and the solution turned a blue color characteristic of copper(II)ions. Write the net ionic equation for this reaction.

What is the chemical formula of the salt produced by the neutralization of nitric acid with calcium hydroxide?

Which substance is acting as a Brønsted acid in the following reaction? HSO4- + NH4+ →\rarr→ H2SO4 + NH3

Select the compound in which sulfur has its highest possible oxidation number.

Based on the solubility rules, which one of the following should be soluble in water?

Identify the element being reduced in the following reaction. 2KBr + F2 →\rarr→ Br2 + 2KF

During a titration the following data were collected.A 10.mL portion of an unknown monoprotic acid solution was titrated with 1.0 M NaOH; 40.mL of the base were required to neutralize the sample. What is the molarity of the acid solution?

Which of the following is an example of a disproportionation reaction?

The oxidation number of N in NO is +7.

Identify the major ionic species present in an aqueous solution of K2SO4.

Chemistry: The Study of Change

Atoms, Molecules, and Ions

Mass Relationships in Chemical Reactions

Gases

Thermo-Chemistry

Quantum Theory and the Electronic Structure of Atoms

Periodic Relationships Among the Elements

Chemical Bonding I: Basic Concepts

Chemical Bonding Ii: Molecular Geometry and Hybridization of Atomic Orbitals

Intermolecular Forces and Liquids and Solids

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Chemistry in the Atmosphere

Entropy, Free Energy, and Equilibrium

Electrochemistry

Metallurgy and the Chemistry of Metals

Nonmetallic Elements and Their Compounds

Transition Metal Chemistry and Coordination Compounds

Nuclear Chemistry

Organic Chemistry

Synthetic and Natural Organic Polymers

Filters

Identify the oxidizing agent in the following reaction. 4Al + 3O₂ $\rarr$ 2Al₂O₃

Identify the major ions present in an aqueous HNO₃solution.

In the following chemical reaction the oxidizing agent is 5S + 6KNO₃ + 2CaCO₃ $\rarr$ 3K₂SO₄ + 2CaSO₄ + CO₂ + 3N₂

The oxidation number of Cl in ClO₃^- is

What mass of K₂CO₃ is needed to prepare 200.mL of a solution having a potassium ion concentration of 0.150 M?

Identify the major ionic species present in an aqueous solution of Na₂CO₃.

Which substance is acting as a Brønsted acid in the following reaction? HSO₄^- + NH₄⁺ $\rarr$ H₂SO₄ + NH₃

Identify the element being reduced in the following reaction. 2KBr + F₂ $\rarr$ Br₂ + 2KF

Identify the major ionic species present in an aqueous solution of K₂SO₄.