Question 1

What element is oxidized in the following chemical reaction
3Cu + 8HNO3 $\rarr$ 3Cu(NO3)2 + 2NO + 4H2O

Accepted Answer

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

Question 2

One method of determining the concentration of hydrogen peroxide (H2O2) in a solution is through titration with the 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 3

The following net ionic equation correctly shows the result of this experiment: A piece of lead metal was added to an aqueous solution of copper(II) nitrate, and within a few minutes it was observed that the lead turned black and crumbled. The characteristic blue solution of copper(II) ions had faded. (NOTE: Lead forms a 2+ ion when it reacts.)
Pb(s) + Cu2+(aq) $\rarr$ Pb2+(aq) + Cu(s)

Accepted Answer

A) True 
 B)False

Question 4

When 50.0 mL of a 0.3000 M AgNO3 solution is added to 50.0 mL of a solution of MgCl2, an AgCl precipitate forms immediately. The precipitate is then filtered from the solution, dried, and weighed. If the recovered AgCl is found to have a mass of 0.1183 g, what was the concentration of magnesium ions in the original MgCl2 solution

Accepted Answer

A)  0.300 M 
B)  8.25 * 10-3 M 
C)  1.65 * 10-2 M 
D)  2.06 * 10-5 M 
E)  4.13 * 10-3 M 
A)  0.300 M 
B)  8.25 * 10-3 M 
C)  1.65 * 10-2 M 
D)  2.06 * 10-5 M 
E)  4.13 * 10-3 M

Question 5

Identify the major ionic species present in an aqueous solution of C12H22O11 (sucrose).

Accepted Answer

A)  12 C-, 22 H+, 11 O- 
B)  12 C+, 22 H+, 11 O2- 
C)  12 CH2+, 11 O2- 
D)  C12+, 22 H+, 11 O2- 
E)  no ions are present 
A)  12 C-, 22 H+, 11 O- 
B)  12 C+, 22 H+, 11 O2- 
C)  12 CH2+, 11 O2- 
D)  C12+, 22 H+, 11 O2- 
E)  no ions are present

Question 6

In this compound what is the correct representation for the oxidation number of each of the elements in Cs2Cr2O7

Accepted Answer

A)  +1; +6; -2 
B)  +2; +4; -2 
C)  +1; +4; -2 
D)  +3; +6; -2 
E)  -1; +6; -2 
A)  +1; +6; -2 
B)  +2; +4; -2 
C)  +1; +4; -2 
D)  +3; +6; -2 
E)  -1; +6; -2

Question 7

158 mL of a 0.148M NaCl solution is added to 228 mL of a 0.369M NH4NO3 solution. The concentration of ammonium ions in the resulting mixture is

Accepted Answer

A)  0.157 M. 
B)  0.218 M. 
C)  0.625 M. 
D)  0.369 M. 
E)  0 M. 
A)  0.157 M. 
B)  0.218 M. 
C)  0.625 M. 
D)  0.369 M. 
E)  0 M.

Question 8

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

Accepted Answer

A)  Hg2Cl2 
B)  Na2S 
C)  Ag2CO3 
D)  Ag2S 
E)  BaSO4 
A)  Hg2Cl2 
B)  Na2S 
C)  Ag2CO3 
D)  Ag2S 
E)  BaSO4

Question 9

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. The solution turned a blue color characteristic of copper(II) ions. Select the correct balanced chemical equation for this reaction.

Accepted Answer

A)  Cu(s) + AgNO3(aq) $\rarr$Ag(s) + Cu(NO3)2(aq) 
B)  Cu(s)2 + AgNO3(aq) $\rarr$ Ag(s) + Cu(NO3)2(aq) 
C)  Cu(s) + 2AgNO3(aq) $\rarr$ 2Ag(s) + Cu(NO3)2(aq) 
D)  2Cu(s) + 2AgNO3(aq) $\rarr$2Ag(s) + 2Cu(NO3)2(aq) 
E)  None of the above 
A)  Cu(s) + AgNO3(aq) $\rarr$Ag(s) + Cu(NO3)2(aq) 
B)  Cu(s)2 + AgNO3(aq) $\rarr$ Ag(s) + Cu(NO3)2(aq) 
C)  Cu(s) + 2AgNO3(aq) $\rarr$ 2Ag(s) + Cu(NO3)2(aq) 
D)  2Cu(s) + 2AgNO3(aq) $\rarr$2Ag(s) + 2Cu(NO3)2(aq) 
E)  None of the above

Question 10

NH3 is a weak electrolyte.

Accepted Answer

A) True 
 B)False

Question 11

A 4.691 g sample of MgCl2 is dissolved in enough water to give 750. mL of solution. What is the magnesium ion concentration in this solution

Accepted Answer

A)  3.70 * 10-2 M 
B)  1.05 * 10-2 M 
C)  6.57 * 10-2 M 
D)  4.93 * 10-2 M 
E)  0.131 M 
A)  3.70 * 10-2 M 
B)  1.05 * 10-2 M 
C)  6.57 * 10-2 M 
D)  4.93 * 10-2 M 
E)  0.131 M

Question 12

Which of the following compounds is a nonelectrolyte

Accepted Answer

A)  NaF 
B)  HNO3 
C)  CH3COOH (acetic acid) 
D)  NaOH 
E)  C6H12O6 (glucose) 
A)  NaF 
B)  HNO3 
C)  CH3COOH (acetic acid) 
D)  NaOH 
E)  C6H12O6 (glucose)

Question 13

Pb is the reducing agent in this process. (Batteries in our cars generate electricity by the following chemical reaction.)
Pb + PbO2 + 2H2SO4 $\rarr$ 2PbSO4 + 2H2O

Accepted Answer

A) True 
 B)False

Question 14

Based on the solubility rules, which of the following compounds should be insoluble in water

Accepted Answer

A)  Na2SO4 
B)  BaSO4 
C)  CuSO4 
D)  MgSO4 
E)  Rb2SO4 
A)  Na2SO4 
B)  BaSO4 
C)  CuSO4 
D)  MgSO4 
E)  Rb2SO4

Question 15

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. How many moles of acid are present in 2.0 liters of this unknown solution

Accepted Answer

A)  6.0 moles 
B)  7.0 moles 
C)  8.0 moles 
D)  9.0 moles 
E)  None of the above 
A)  6.0 moles 
B)  7.0 moles 
C)  8.0 moles 
D)  9.0 moles 
E)  None of the above

Question 16

Lithium metal dissolves in water to yield hydrogen gas and aqueous lithium hydroxide. What is the final concentration of hydroxide ions when 5.500 g of lithium metal is dropped into 750. mL of water

Accepted Answer

A)  1.06 M 
B)  0.528 M 
C)  2.11 M 
D)  0.792 M 
E)  0.943 M 
A)  1.06 M 
B)  0.528 M 
C)  2.11 M 
D)  0.792 M 
E)  0.943 M

Question 17

What volume of concentrated nitric acid (15.0 M) is required to make 100. mL of a 3.0 M nitric acid solution

Accepted Answer

A)  20. mL 
B)  30. mL 
C)  40. mL 
D)  50. mL 
E)  None of the above 
A)  20. mL 
B)  30. mL 
C)  40. mL 
D)  50. mL 
E)  None of the above

Question 18

Identify the elements that are oxidized and reduced in the following reaction.KClO3(aq) + 6HBr(aq) $\rarr$ KCl(aq) + 3Br2(l) + 3H2O(l)

Accepted Answer

A)  Br is oxidized and Cl is reduced 
B)  Cl is oxidized and H is reduced 
C)  H is oxidized and O is reduced 
D)  O is oxidized and Cl is reduced 
E)  Cl is oxidized and Br is reduced 
A)  Br is oxidized and Cl is reduced 
B)  Cl is oxidized and H is reduced 
C)  H is oxidized and O is reduced 
D)  O is oxidized and Cl is reduced 
E)  Cl is oxidized and Br is reduced

Question 19

Predict the products of the following single replacement reaction.
Zn(s) + CoCl2(aq) $\rarr$

Accepted Answer

A)  No reaction occurs 
B)  Co(s) + ZnCl2(aq) 
C)  CoCl(aq) + ZnCl(aq) 
D)  ZnCo(aq) + Cl2(g) 
E)  ZnCoCl2(aq) 
A)  No reaction occurs 
B)  Co(s) + ZnCl2(aq) 
C)  CoCl(aq) + ZnCl(aq) 
D)  ZnCo(aq) + Cl2(g) 
E)  ZnCoCl2(aq)

Question 20

When 20.0 mL of a 0.250 M (NH4)2S solution is added to 150.0 mL of a solution of Cu(NO3)2, a CuS precipitate forms. The precipitate is then filtered from the solution, dried, and weighed. If the recovered CuS is found to have a mass of 0.3491 g, what was the concentration of copper ions in the original Cu(NO3)2 solution

Accepted Answer

A)  3.65 * 10-3 M 
B)  1.22 * 10-2 M 
C)  3.33 * 10-2 M 
D)  4.87 * 10-2 M 
E)  2.43 * 10-2 M 
A)  3.65 * 10-3 M 
B)  1.22 * 10-2 M 
C)  3.33 * 10-2 M 
D)  4.87 * 10-2 M 
E)  2.43 * 10-2 M

What element is oxidized in the following chemical reaction 3Cu + 8HNO₃ $\rarr$ 3Cu(NO₃)₂ + 2NO + 4H₂O

Identify the major ionic species present in an aqueous solution of C₁₂H₂₂O₁₁ (sucrose).

In this compound what is the correct representation for the oxidation number of each of the elements in Cs₂Cr₂O₇

158 mL of a 0.148M NaCl solution is added to 228 mL of a 0.369M NH₄NO₃ solution. The concentration of ammonium ions in the resulting mixture is

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

NH₃ is a weak electrolyte.

A 4.691 g sample of MgCl₂ is dissolved in enough water to give 750. mL of solution. What is the magnesium ion concentration in this solution

Which of the following compounds is a nonelectrolyte

Pb is the reducing agent in this process. (Batteries in our cars generate electricity by the following chemical reaction.) Pb + PbO₂ + 2H₂SO₄ $\rarr$ 2PbSO₄ + 2H₂O

Based on the solubility rules, which of the following compounds should be insoluble in water

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. How many moles of acid are present in 2.0 liters of this unknown solution

Lithium metal dissolves in water to yield hydrogen gas and aqueous lithium hydroxide. What is the final concentration of hydroxide ions when 5.500 g of lithium metal is dropped into 750. mL of water

What volume of concentrated nitric acid (15.0 M) is required to make 100. mL of a 3.0 M nitric acid solution

Identify the elements that are oxidized and reduced in the following reaction.KClO₃(aq) + 6HBr(aq) $\rarr$ KCl(aq) + 3Br₂(l) + 3H₂O(l)

Predict the products of the following single replacement reaction. Zn(s) + CoCl₂(aq) $\rarr$

Chemistry: The Study of Change

Atoms Molecules and Ions

Mass Relationships in Chemical Reactions

Gases

Thermochemistry

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

Intermolecular Forces and Liquids and Solids

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

Chemistry in the Atmosphere

Metallurgy and the Chemistry of Metals

Nonmetallic Elements and Their Compounds

Transition Metals Chemistry and Coordination Compounds

Organic Chemistry

Synthetic and Natural Organic Polymers

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Exam 4: Reactions in Aqueous Solutions

What element is oxidized in the following chemical reaction 3Cu + 8HNO3 →\rarr→ 3Cu(NO3)2 + 2NO + 4H2O

Identify the major ionic species present in an aqueous solution of C12H22O11 (sucrose).

In this compound what is the correct representation for the oxidation number of each of the elements in Cs2Cr2O7

158 mL of a 0.148M NaCl solution is added to 228 mL of a 0.369M NH4NO3 solution. The concentration of ammonium ions in the resulting mixture is

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

NH3 is a weak electrolyte.

A 4.691 g sample of MgCl2 is dissolved in enough water to give 750. mL of solution. What is the magnesium ion concentration in this solution

Which of the following compounds is a nonelectrolyte

Pb is the reducing agent in this process. (Batteries in our cars generate electricity by the following chemical reaction.) Pb + PbO2 + 2H2SO4 →\rarr→ 2PbSO4 + 2H2O

Based on the solubility rules, which of the following compounds should be insoluble in water

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. How many moles of acid are present in 2.0 liters of this unknown solution

Lithium metal dissolves in water to yield hydrogen gas and aqueous lithium hydroxide. What is the final concentration of hydroxide ions when 5.500 g of lithium metal is dropped into 750. mL of water

What volume of concentrated nitric acid (15.0 M) is required to make 100. mL of a 3.0 M nitric acid solution

Identify the elements that are oxidized and reduced in the following reaction.KClO3(aq) + 6HBr(aq) →\rarr→ KCl(aq) + 3Br2(l) + 3H2O(l)

Predict the products of the following single replacement reaction. Zn(s) + CoCl2(aq) →\rarr→

Chemistry: The Study of Change

Atoms Molecules and Ions

Mass Relationships in Chemical Reactions

Gases

Thermochemistry

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

Intermolecular Forces and Liquids and Solids

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

Chemistry in the Atmosphere

Metallurgy and the Chemistry of Metals

Nonmetallic Elements and Their Compounds

Transition Metals Chemistry and Coordination Compounds

Organic Chemistry

Synthetic and Natural Organic Polymers

Filters

What element is oxidized in the following chemical reaction 3Cu + 8HNO₃ $\rarr$ 3Cu(NO₃)₂ + 2NO + 4H₂O

Identify the major ionic species present in an aqueous solution of C₁₂H₂₂O₁₁ (sucrose).

In this compound what is the correct representation for the oxidation number of each of the elements in Cs₂Cr₂O₇

158 mL of a 0.148M NaCl solution is added to 228 mL of a 0.369M NH₄NO₃ solution. The concentration of ammonium ions in the resulting mixture is

NH₃ is a weak electrolyte.

A 4.691 g sample of MgCl₂ is dissolved in enough water to give 750. mL of solution. What is the magnesium ion concentration in this solution

Pb is the reducing agent in this process. (Batteries in our cars generate electricity by the following chemical reaction.) Pb + PbO₂ + 2H₂SO₄ $\rarr$ 2PbSO₄ + 2H₂O

Identify the elements that are oxidized and reduced in the following reaction.KClO₃(aq) + 6HBr(aq) $\rarr$ KCl(aq) + 3Br₂(l) + 3H₂O(l)

Predict the products of the following single replacement reaction. Zn(s) + CoCl₂(aq) $\rarr$