Question 1

Define precipitate and illustrate with an example.

Accepted Answer

(Answers will vary.)A precipitate is an

Question 2

For which one of the following acids is chlorine in the +5 oxidation state?

Accepted Answer

A) HCl 
B) HClO 
C) HClO2 
D) HClO3 
E) HClO4 
A) HCl 
B) HClO 
C) HClO2 
D) HClO3 
E) HClO4

Question 3

Thorium metal is prepared by reacting thorium oxide with calcium.
ThO2 + 2Ca $\rarr$ Th + 2CaO
Which substance is oxidized in this process?

Accepted Answer

The answer of Thorium metal is prepared by reacting thorium...

Question 4

The oxidation number of S in K2SO4 is

Accepted Answer

A) +6. 
B) +4. 
C) +2. 
D) -1. 
E) None of the above. 
A) +6. 
B) +4. 
C) +2. 
D) -1. 
E) None of the above.

Question 5

If 73.5 mL of 0.200 M KI(aq)was required to precipitate all of the lead(II)ion from an aqueous solution of lead(II)nitrate, how many moles of Pb2+ were originally in the solution?

Accepted Answer

7.35 * 10^-3

Question 6

During a titration the following data were collected. A 50.0 mL portion of an HCl solution was titrated with 0.500 M NaOH; 200. mL of the base was required to neutralize the sample. How many grams of HCl are present in 500. mL of this acid solution?

Accepted Answer

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

Question 7

The oxidation number of N in N2H4 is

Accepted Answer

A) +4. 
B) -4. 
C) +2. 
D) -2. 
E) 0. 
A) +4. 
B) -4. 
C) +2. 
D) -2. 
E) 0.

Question 8

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 9

Batteries in our cars generate electricity by the following chemical reaction.
Pb + PbO2 + 2H2SO4 $\rarr$ 2PbSO4 + 2H2O
Which substance is reduced in this process?

Accepted Answer

The answer of Batteries in our cars generate electricity by...

Question 10

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

Accepted Answer

The answer of Identify the reducing agent in the following...

Question 11

Which of the following represents a metal displacement reaction?

Accepted Answer

A) 2NaN3(s)$\rarr$2Na(s)+ 3N2(g) 
B) Fe2O3(s)+ 2Al(s)$\rarr$ 2Fe(s)+ Al2O3(s) 
C) 3NO2(g)+ H2O(l)$\rarr$ 2HNO3(aq)+ NO(g) 
D) 2P(s)+ 3Cl2(g)$\rarr$ 2PCl3(g) 
E) 2ZnS(s)+ 3O2(g)$\rarr$ 2ZnO(s)+ 2SO2(g) 
A) 2NaN3(s)$\rarr$2Na(s)+ 3N2(g) 
B) Fe2O3(s)+ 2Al(s)$\rarr$ 2Fe(s)+ Al2O3(s) 
C) 3NO2(g)+ H2O(l)$\rarr$ 2HNO3(aq)+ NO(g) 
D) 2P(s)+ 3Cl2(g)$\rarr$ 2PCl3(g) 
E) 2ZnS(s)+ 3O2(g)$\rarr$ 2ZnO(s)+ 2SO2(g)

Question 12

Based on the solubility rules, which of the following will occur when solutions of ZnSO4(aq)and MgCl2(aq)are mixed?

Accepted Answer

A) ZnCl2 will precipitate; Mg2+ and SO42-  will be spectator ions. 
B) ZnSO4 will precipitate; Mg2+ and Cl- will be spectator ions. 
C) MgSO4 will precipitate; Zn2+ and Cl- will be spectator ions. 
D) MgCl2 will precipitate; Zn2+ and SO42- will be spectator ions. 
E) No precipitate will form. 
A) ZnCl2 will precipitate; Mg2+ and SO42-  will be spectator ions. 
B) ZnSO4 will precipitate; Mg2+ and Cl- will be spectator ions. 
C) MgSO4 will precipitate; Zn2+ and Cl- will be spectator ions. 
D) MgCl2 will precipitate; Zn2+ and SO42- will be spectator ions. 
E) No precipitate will form.

Question 13

Based on the solubility rules, which of the following will occur if solutions of CuSO4(aq)and BaCl2(aq)are mixed?

Accepted Answer

A) CuCl2 will precipitate; Ba2+ and SO42 - are spectator ions. 
B) CuSO4 will precipitate; Ba2+ and Cl - are spectator ions. 
C) BaSO4 will precipitate; Cu2+ and Cl- are spectator ions. 
D) BaCl2 will precipitate; Cu2+ and SO42 -  are spectator ions. 
E) No precipitate will form. 
A) CuCl2 will precipitate; Ba2+ and SO42 - are spectator ions. 
B) CuSO4 will precipitate; Ba2+ and Cl - are spectator ions. 
C) BaSO4 will precipitate; Cu2+ and Cl- are spectator ions. 
D) BaCl2 will precipitate; Cu2+ and SO42 -  are spectator ions. 
E) No precipitate will form.

Question 14

Batteries in our cars generate electricity by the following chemical reaction.
Pb + PbO2 + 2H2SO4 $\rarr$ 2PbSO4 + 2H2O
Which substance is oxidized in this process?

Accepted Answer

The answer of Batteries in our cars generate electricity by...

Question 15

Which of the following compounds is a weak electrolyte?

Accepted Answer

A) HCl 
B) NH3 
C) C6H12O6 (glucose) 
D) N2 
E) KCl 
A) HCl 
B) NH3 
C) C6H12O6 (glucose) 
D) N2 
E) KCl

Question 16

What is the chemical formula of the salt produced by the complete neutralization of sodium hydroxide with sulfuric acid?

Accepted Answer

A) Na2SO4 
B) Na2(SO4)3 
C) Na(SO4)2 
D) NaSO3 
E) Na3SO4 
A) Na2SO4 
B) Na2(SO4)3 
C) Na(SO4)2 
D) NaSO3 
E) Na3SO4

Question 17

Which of the following is the correct net ionic equation for the reaction that occurs when solutions of Pb(NO3)2 and NH4Cl are mixed?

Accepted Answer

A) Pb(NO3)2(aq)+ 2NH4Cl(aq) $\rarr$NH4NO3(aq)+ PbCl2(s) 
B) Pb2+(aq)+ 2Cl-(aq) $\rarr$ PbCl2(s) 
C) Pb2+(aq)+ 2NO3- (aq)+ 2NH   (aq)+ 2Cl-(aq) $\rarr$ 2NH   (aq)+ 2NO3- (aq)+ PbCl2(s) 
D) NH4+(aq)+ NO3- (aq) $\rarr$2NH4NO3(s) 
E) No reaction occurs when the solutions are mixed. 
A) Pb(NO3)2(aq)+ 2NH4Cl(aq) $\rarr$NH4NO3(aq)+ PbCl2(s) 
B) Pb2+(aq)+ 2Cl-(aq) $\rarr$ PbCl2(s) 
C) Pb2+(aq)+ 2NO3- (aq)+ 2NH   (aq)+ 2Cl-(aq) $\rarr$ 2NH   (aq)+ 2NO3- (aq)+ PbCl2(s) 
D) NH4+(aq)+ NO3- (aq) $\rarr$2NH4NO3(s) 
E) No reaction occurs when the solutions are mixed.

Question 18

Which choice gives the correct oxidation numbers for all three elements in Ca(ClO)2 in the order that the elements are shown in the formula?

Accepted Answer

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

Question 19

Identify the following compound as an electrolyte or nonelectrolyte: MgCl2.

Accepted Answer

Question 20

Thorium metal is prepared by reacting thorium oxide with calcium.
ThO2 + 2Ca $\rarr$ Th + 2CaO
What is the reducing agent in this process?

Accepted Answer

The answer of Thorium metal is prepared by reacting thorium...

Exam 4: Reactions in Aqueous Solution

Define precipitate and illustrate with an example.

For which one of the following acids is chlorine in the +5 oxidation state?

Thorium metal is prepared by reacting thorium oxide with calcium. ThO2 + 2Ca →\rarr→ Th + 2CaO Which substance is oxidized in this process?

The oxidation number of S in K2SO4 is

If 73.5 mL of 0.200 M KI(aq)was required to precipitate all of the lead(II)ion from an aqueous solution of lead(II)nitrate, how many moles of Pb2+ were originally in the solution?

During a titration the following data were collected. A 50.0 mL portion of an HCl solution was titrated with 0.500 M NaOH; 200. mL of the base was required to neutralize the sample. How many grams of HCl are present in 500. mL of this acid solution?

The oxidation number of N in N2H4 is

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.

Batteries in our cars generate electricity by the following chemical reaction. Pb + PbO2 + 2H2SO4 →\rarr→ 2PbSO4 + 2H2O Which substance is reduced in this process?

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

Which of the following represents a metal displacement reaction?

Based on the solubility rules, which of the following will occur when solutions of ZnSO4(aq)and MgCl2(aq)are mixed?

Based on the solubility rules, which of the following will occur if solutions of CuSO4(aq)and BaCl2(aq)are mixed?

Batteries in our cars generate electricity by the following chemical reaction. Pb + PbO2 + 2H2SO4 →\rarr→ 2PbSO4 + 2H2O Which substance is oxidized in this process?

Which of the following compounds is a weak electrolyte?

What is the chemical formula of the salt produced by the complete neutralization of sodium hydroxide with sulfuric acid?

Which of the following is the correct net ionic equation for the reaction that occurs when solutions of Pb(NO3)2 and NH4Cl are mixed?

Which choice gives the correct oxidation numbers for all three elements in Ca(ClO)2 in the order that the elements are shown in the formula?

Identify the following compound as an electrolyte or nonelectrolyte: MgCl2.

Thorium metal is prepared by reacting thorium oxide with calcium. ThO2 + 2Ca →\rarr→ Th + 2CaO What is the reducing agent in this process?

Introduction

Atoms, Molecules, and Ions

Stoichiometry

Gases

Energy Relationships in Chemical Reactions

The Electronic Structure of Atoms

The Periodic Table

Chemical Bonding I: the Covalent Bond

Chemical Bonding Ii: Molecular Geometry and Hybridization of Atomic Orbitals

Introduction to Organic Chemistry

Intermolecular Forces and Liquids and Solids

Physical Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Acid-Base Equilibria and Solubility Equilibria

Thermodynamics

Redox Reactions and Electrochemistry

The Chemistry of Coordination Compounds

Nuclear Chemistry

Organic Polymerssynthetic and Natural

Filters

Thorium metal is prepared by reacting thorium oxide with calcium. ThO₂ + 2Ca $\rarr$ Th + 2CaO Which substance is oxidized in this process?

The oxidation number of S in K₂SO₄ is

If 73.5 mL of 0.200 M KI(aq)was required to precipitate all of the lead(II)ion from an aqueous solution of lead(II)nitrate, how many moles of Pb²⁺ were originally in the solution?

The oxidation number of N in N₂H₄ is

Batteries in our cars generate electricity by the following chemical reaction. Pb + PbO₂ + 2H₂SO₄ $\rarr$ 2PbSO₄ + 2H₂O Which substance is reduced in this process?

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

Based on the solubility rules, which of the following will occur when solutions of ZnSO₄(aq)and MgCl₂(aq)are mixed?

Based on the solubility rules, which of the following will occur if solutions of CuSO₄(aq)and BaCl₂(aq)are mixed?

Batteries in our cars generate electricity by the following chemical reaction. Pb + PbO₂ + 2H₂SO₄ $\rarr$ 2PbSO₄ + 2H₂O Which substance is oxidized in this process?

Which of the following is the correct net ionic equation for the reaction that occurs when solutions of Pb(NO₃)₂ and NH₄Cl are mixed?

Which choice gives the correct oxidation numbers for all three elements in Ca(ClO)₂ in the order that the elements are shown in the formula?

Identify the following compound as an electrolyte or nonelectrolyte: MgCl₂.

Thorium metal is prepared by reacting thorium oxide with calcium. ThO₂ + 2Ca $\rarr$ Th + 2CaO What is the reducing agent in this process?