Question 1

Which of the following is a precipitation reaction?

Accepted Answer

A) 
$2 \mathrm { HBr } ( a q ) + \mathrm { NiS } ( s ) \rightarrow \mathrm { NiBr } _ { 2 } ( a q ) + \mathrm { H } _ { 2 } \mathrm {~S} ( g )$ 
B)  $\mathrm { NH } _ { 4 } \mathrm { I } ( a q ) + \mathrm { NaOH } ( a q ) \rightarrow \mathrm { H } _ { 2 } \mathrm { O } ( l ) + \mathrm { NH } _ { 3 } ( g ) + \mathrm { NaI } ( a q )$ 
C) 
$2 \mathrm { C } _ { 4 } \mathrm { H } _ { 6 } ( g ) + 11 \mathrm { O } _ { 2 } ( g ) \rightarrow 8 \mathrm { CO } _ { 2 } ( g ) + 6 \mathrm { H } _ { 2 } \mathrm { O } ( g )$ 
D) 
$4 \mathrm { NO } ( g ) + 6 \mathrm { H } _ { 2 } \mathrm { O } ( g ) \rightarrow 4 \mathrm { NH } _ { 3 } ( g ) + 5 \mathrm { O } _ { 2 } ( g )$ 
E)  $\mathrm { CrBr } _ { 2 } ( a q ) + \mathrm { Na } _ { 2 } \mathrm { CO } _ { 3 } ( a q ) \rightarrow \mathrm { CrCO } _ { 3 } ( s ) + 2 \mathrm { NaBr } ( a q )$ 
A) 
$2 \mathrm { HBr } ( a q ) + \mathrm { NiS } ( s ) \rightarrow \mathrm { NiBr } _ { 2 } ( a q ) + \mathrm { H } _ { 2 } \mathrm {~S} ( g )$ 
B)  $\mathrm { NH } _ { 4 } \mathrm { I } ( a q ) + \mathrm { NaOH } ( a q ) \rightarrow \mathrm { H } _ { 2 } \mathrm { O } ( l ) + \mathrm { NH } _ { 3 } ( g ) + \mathrm { NaI } ( a q )$ 
C) 
$2 \mathrm { C } _ { 4 } \mathrm { H } _ { 6 } ( g ) + 11 \mathrm { O } _ { 2 } ( g ) \rightarrow 8 \mathrm { CO } _ { 2 } ( g ) + 6 \mathrm { H } _ { 2 } \mathrm { O } ( g )$ 
D) 
$4 \mathrm { NO } ( g ) + 6 \mathrm { H } _ { 2 } \mathrm { O } ( g ) \rightarrow 4 \mathrm { NH } _ { 3 } ( g ) + 5 \mathrm { O } _ { 2 } ( g )$ 
E)  $\mathrm { CrBr } _ { 2 } ( a q ) + \mathrm { Na } _ { 2 } \mathrm { CO } _ { 3 } ( a q ) \rightarrow \mathrm { CrCO } _ { 3 } ( s ) + 2 \mathrm { NaBr } ( a q )$

Question 2

Identify the spectator ions in the following molecular equation: KBr(aq)+ AgNO3(aq)→ AgBr(s)+ KNO3(aq)

Accepted Answer

A) Ag+ and Br- 
B) K+ and NO3- 
C) K+ and Br- 
D) Ag+ and NO3- 
E) There are no spectator ions in this reaction. 
A) Ag+ and Br- 
B) K+ and NO3- 
C) K+ and Br- 
D) Ag+ and NO3- 
E) There are no spectator ions in this reaction.

Question 3

Choose the reaction that represents the combustion of C6H12O2.

Accepted Answer

A) C6H12O2(l)+ 8O2(g)→ 6CO2(g)+ 6H2O(g) 
B) Mg(s)+ C6H12O2(l)→ MgC6H12O2(aq) 
C) 6C(s)+ 6H2(g)+ O2(g)→ C6H12O2(l) 
D) C6H12O2(l) → 6C(s)+ 6H2(g)+ O2(g) 
E) None of the above represents the combustion of C6H12O2. 
A) C6H12O2(l)+ 8O2(g)→ 6CO2(g)+ 6H2O(g) 
B) Mg(s)+ C6H12O2(l)→ MgC6H12O2(aq) 
C) 6C(s)+ 6H2(g)+ O2(g)→ C6H12O2(l) 
D) C6H12O2(l) → 6C(s)+ 6H2(g)+ O2(g) 
E) None of the above represents the combustion of C6H12O2.

Question 4

Identify the net ionic equation for the reaction (if any)that occurs when aqueous solutions of H2SO4 and KOH are mixed.

Accepted Answer

A) H+(aq)+ OH-(aq)→ H2O(l) 
B) 2K+(aq)+ SO42-(aq)→ K2SO4(s) 
C) H+(aq)+ OH-(aq)+ 2K+(aq)+ SO42-(aq)→ H2O(l)+ K2SO4(s) 
D) H22+(aq)+ OH-(aq)→ H2(OH)2(l) 
E) No reaction occurs. 
A) H+(aq)+ OH-(aq)→ H2O(l) 
B) 2K+(aq)+ SO42-(aq)→ K2SO4(s) 
C) H+(aq)+ OH-(aq)+ 2K+(aq)+ SO42-(aq)→ H2O(l)+ K2SO4(s) 
D) H22+(aq)+ OH-(aq)→ H2(OH)2(l) 
E) No reaction occurs.

Question 5

Magnesium burns in air with a dazzling brilliance to produce magnesium oxide: 
2Mg(s)+ $\mathrm { O } _ { 2 }$ (g)? 2MgO(s)
When 6.00 g of magnesium burns,what is the theoretical yield of magnesium oxide?

Accepted Answer

A) 0.247 g 
B) 19.9 g 
C) 6.00 g 
D) 4.97 g 
E) 9.95 g 
A) 0.247 g 
B) 19.9 g 
C) 6.00 g 
D) 4.97 g 
E) 9.95 g

Question 6

Dinitrogen monoxide gas decomposes to form nitrogen gas and oxygen gas.How many grams of oxygen are formed when 10.0 g of dinitrogen monoxide decomposes?

Accepted Answer

A) 0.275 g 
B) 3.64 g 
C) 7.27 g 
D) 14.5 g 
A) 0.275 g 
B) 3.64 g 
C) 7.27 g 
D) 14.5 g

Question 7

Balance the following redox reaction if it occurs in acidic solution.What are the coefficients in front of Cd and Ag+ in the balanced reaction? 
Cd(s)+ Ag+(aq)→ Ag(s)+ Cd2+(aq)

Accepted Answer

A) Cd = 1,Ag+ = 2 
B) Cd = 1,Ag+ = 1 
C) Cd = 2,Ag+ = 1 
D) Cd = 2,Ag+ = 2 
E) Cd = 3,Ag+ = 1 
A) Cd = 1,Ag+ = 2 
B) Cd = 1,Ag+ = 1 
C) Cd = 2,Ag+ = 1 
D) Cd = 2,Ag+ = 2 
E) Cd = 3,Ag+ = 1

Question 8

Which of the following is considered a strong electrolyte?

Accepted Answer

A) NH4NO3 
B) C12H22O11 
C) PbCl2 
D) HC2H3O2 
E) CH3OH 
A) NH4NO3 
B) C12H22O11 
C) PbCl2 
D) HC2H3O2 
E) CH3OH

Question 9

Which of the following describes acetic acid?

Accepted Answer

A) strong electrolyte,weak acid 
B) weak electrolyte,weak acid 
C) strong electrolyte,strong acid 
D) weak electrolyte,strong acid 
E) nonelectrolyte 
A) strong electrolyte,weak acid 
B) weak electrolyte,weak acid 
C) strong electrolyte,strong acid 
D) weak electrolyte,strong acid 
E) nonelectrolyte

Question 10

Which of the following compounds is an Arrhenius base?

Accepted Answer

A) C6H12O6 
B) HOCl 
C) H2SO4 
D) C6H5NH2 
A) C6H12O6 
B) HOCl 
C) H2SO4 
D) C6H5NH2

Question 11

How many grams of CH3 OH must be added to water to prepare 150 mL of a solution that is 2.0 mol L-1 CH3 OH?

Accepted Answer

Question 12

Determine the oxidation state of S in MgSO4.

Accepted Answer

A) -4 
B) +2 
C) +4 
D) +6 
E) -2 
A) -4 
B) +2 
C) +4 
D) +6 
E) -2

Question 13

How many millilitres of 0.152 mol L-1 $\mathrm { HClO } _ { 4 }$ solution are needed to neutralize 50.00 mL of 0.0793 mol L-1 NaOH?

Accepted Answer

A) 0.0383 
B) 0.104 
C) 0.603 
D) 95.8 
E) 26.1 
A) 0.0383 
B) 0.104 
C) 0.603 
D) 95.8 
E) 26.1

Question 14

Define a spectator ion.

Accepted Answer

An ion tha

Question 15

How many millilitres of a 0.266 mol L-1 LiNO3 solution are required to make 150.0 mL of 0.075 mol L-1 LiNO3 solution?

Accepted Answer

A) 53.2 mL 
B) 42.3 mL 
C) 18.8 mL 
D) 23.6 mL 
E) 35.1 mL 
A) 53.2 mL 
B) 42.3 mL 
C) 18.8 mL 
D) 23.6 mL 
E) 35.1 mL

Question 16

What is the molar concentration of sodium ions in a 0.450 mol L-1 Na3PO4 solution?

Accepted Answer

A) 0.150 mol L-1 
B) 0.450 mol L-1 
C) 1.35 mol L-1 
D) 1.80 mol L-1 
A) 0.150 mol L-1 
B) 0.450 mol L-1 
C) 1.35 mol L-1 
D) 1.80 mol L-1

Question 17

How can you tell if a reaction is an oxidation-reduction reaction?

Accepted Answer

At least one species is losing electrons

Question 18

What element is being reduced in the following (unbalanced)redox reaction? Cr(OH)4- (aq)+ ClO- (aq)→ CrO42- (aq)+ Cl- (aq)

Accepted Answer

A) Cr 
B) O 
C) H 
D) Cl 
A) Cr 
B) O 
C) H 
D) Cl

Question 19

Calculate the concentration (M)of sodium ions in a solution made by diluting 80.0 mL of a 0.174 mol L-1 solution of sodium sulfide to a total volume of 125 mL.

Accepted Answer

Question 20

Calculate the concentration (molarity)of a solution prepared by dissolving 72.8 g C2H6O in 2.34 L of water.

Accepted Answer

A) 1.58 M 
B) 1.48 M 
C) 0.987 M 
D) 0.633 M 
E) 0.675 M 
A) 1.58 M 
B) 1.48 M 
C) 0.987 M 
D) 0.633 M 
E) 0.675 M

Exam 4: Chemical Reactions and Stoichiometry

Which of the following is a precipitation reaction?

Identify the spectator ions in the following molecular equation: KBr(aq)+ AgNO3(aq)→ AgBr(s)+ KNO3(aq)

Choose the reaction that represents the combustion of C6H12O2.

Identify the net ionic equation for the reaction (if any)that occurs when aqueous solutions of H2SO4 and KOH are mixed.

Magnesium burns in air with a dazzling brilliance to produce magnesium oxide: 2Mg(s)+ O2\mathrm { O } _ { 2 }O2​ (g)? 2MgO(s) When 6.00 g of magnesium burns,what is the theoretical yield of magnesium oxide?

Dinitrogen monoxide gas decomposes to form nitrogen gas and oxygen gas.How many grams of oxygen are formed when 10.0 g of dinitrogen monoxide decomposes?

Balance the following redox reaction if it occurs in acidic solution.What are the coefficients in front of Cd and Ag+ in the balanced reaction? Cd(s)+ Ag+(aq)→ Ag(s)+ Cd2+(aq)

Which of the following is considered a strong electrolyte?

Which of the following describes acetic acid?

Which of the following compounds is an Arrhenius base?

How many grams of CH3 OH must be added to water to prepare 150 mL of a solution that is 2.0 mol L-1 CH3 OH?

Determine the oxidation state of S in MgSO4.

How many millilitres of 0.152 mol L-1 HClO4\mathrm { HClO } _ { 4 }HClO4​ solution are needed to neutralize 50.00 mL of 0.0793 mol L-1 NaOH?

Define a spectator ion.

How many millilitres of a 0.266 mol L-1 LiNO3 solution are required to make 150.0 mL of 0.075 mol L-1 LiNO3 solution?

What is the molar concentration of sodium ions in a 0.450 mol L-1 Na3PO4 solution?

How can you tell if a reaction is an oxidation-reduction reaction?

What element is being reduced in the following (unbalanced)redox reaction? Cr(OH)4- (aq)+ ClO- (aq)→ CrO42- (aq)+ Cl- (aq)

Calculate the concentration (M)of sodium ions in a solution made by diluting 80.0 mL of a 0.174 mol L-1 solution of sodium sulfide to a total volume of 125 mL.

Calculate the concentration (molarity)of a solution prepared by dissolving 72.8 g C2H6O in 2.34 L of water.

Units of Measurement for Physical and Chemical Change

Atoms and Elements

Molecules,compounds,and Nomenclature

Gases

Thermochemistry

The Quantum-Mechanical Model of the Atom

Periodic Properties of the Elements

Chemical Bonding I: Lewis Theory

Chemical Bonding II: Molecular Shapes, valence Bond Theory, and Molecular Orbital Theory

Liquids, solids, and Intermolecular Forces

Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases

Aqueous Ionic Equilibrium

Gibbs Energy and Thermodynamics

Electrochemistry

Radioactivity and Nuclear Chemistry

Organic Chemistry I: Structures

Organic Chemistry II: Reactions

Biochemistry

Chemistry of the Nonmetals

Metals and Metallurgy

Transition Metals and Coordination Compounds

Filters

Identify the spectator ions in the following molecular equation: KBr(aq)+ AgNO₃(aq)→ AgBr(s)+ KNO₃(aq)

Choose the reaction that represents the combustion of C₆H₁₂O₂.

Identify the net ionic equation for the reaction (if any)that occurs when aqueous solutions of H₂SO₄ and KOH are mixed.

Magnesium burns in air with a dazzling brilliance to produce magnesium oxide: 2Mg(s)+ $\mathrm { O } _ { 2 }$ (g)? 2MgO(s) When 6.00 g of magnesium burns,what is the theoretical yield of magnesium oxide?

Balance the following redox reaction if it occurs in acidic solution.What are the coefficients in front of Cdand Ag⁺ in the balanced reaction? Cd(s)+ Ag⁺(aq)→ Ag(s)+ Cd²⁺(aq)

How many grams of CH₃ OH must be added to water to prepare 150 mL of a solution that is 2.0 mol L^-1 CH₃ OH?

Determine the oxidation state of S in MgSO₄.

How many millilitres of 0.152 mol L^-1 $\mathrm { HClO } _ { 4 }$ solution are needed to neutralize 50.00 mL of 0.0793 mol L^-1 NaOH?

How many millilitres of a 0.266 mol L^-1 LiNO₃ solution are required to make 150.0 mL of 0.075 mol L^-1 LiNO₃ solution?

What is the molar concentration of sodium ions in a 0.450 mol L^-1 Na₃PO₄ solution?

What element is being reduced in the following (unbalanced)redox reaction? Cr(OH)₄^- (aq)+ ClO^- (aq)→ CrO₄²^- (aq)+ Cl^- (aq)

Calculate the concentration (M)of sodium ions in a solution made by diluting 80.0 mL of a 0.174 mol L^-1 solution of sodium sulfide to a total volume of 125 mL.

Calculate the concentration (molarity)of a solution prepared by dissolving 72.8 g C₂H₆O in 2.34 L of water.