Question 1

The highest possible oxidation number of nitrogen is

Accepted Answer

A) +8 
B) +5 
C) +3 
D) +1 
E) -3 
A) +8 
B) +5 
C) +3 
D) +1 
E) -3

Question 2

Identify the following compound as a strong electrolyte, weak electrolyte, or nonelectrolyte: NH3.

Accepted Answer

Question 3

Identify the following compound as a strong electrolyte, weak electrolyte, or nonelectrolyte: Al(NO3)3

Accepted Answer

Question 4

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

Question 5

When solid iron(II)hydroxide is added to water, the resulting solution contains 1.4×10-3g of dissolved iron(II)hydroxide per liter of solution.What is the hydroxide ion concentration in this solution?

Accepted Answer

A) 7.8×10-6 M 
B) 1.6×10-5 M 
C) 2.5×10-10 M 
D) 3.1×10-5 M 
E) 4.0×10-3 M 
A) 7.8×10-6 M 
B) 1.6×10-5 M 
C) 2.5×10-10 M 
D) 3.1×10-5 M 
E) 4.0×10-3 M

Question 6

Determine the oxidation number of each of the elements in NaAl(OH)4?

Accepted Answer

the oxidation number of Na is

Question 7

Write the balanced molecular and net ionic equations for the reaction that would occur between CuCl2(aq)and Pb(s).Be sure to include the correct states in your final equations.If no reaction is expected, write "no reaction."

Accepted Answer

Molecular equation: CuCl₂(aq)+

Question 8

Identify the correct net ionic equation for the reaction that occurs when solutions of HF and KOH are mixed.

Accepted Answer

A) H+(aq)+ OH-(aq)$\rarr$H2O(l) 
B) HF(aq)+ OH-(aq)$\rarr$H2O(l)+ F-(aq) 
C) H+(aq)+ KOH(aq)$\rarr$H2O(l)+ K+(aq) 
D) HF(aq)+ KOH(aq)$\rarr$H2O(l)+ KF(s) 
E) HF(aq)+ KOH(s)$\rarr$H2O(l)+ KF(aq) 
A) H+(aq)+ OH-(aq)$\rarr$H2O(l) 
B) HF(aq)+ OH-(aq)$\rarr$H2O(l)+ F-(aq) 
C) H+(aq)+ KOH(aq)$\rarr$H2O(l)+ K+(aq) 
D) HF(aq)+ KOH(aq)$\rarr$H2O(l)+ KF(s) 
E) HF(aq)+ KOH(s)$\rarr$H2O(l)+ KF(aq)

Question 9

Categorize the following reaction as an acid-base neutralization, precipitation, combination, decomposition, combustion, displacement, or disproportionation reaction.
Ba(C2H3O2)2(aq)+ Na2CO3(aq)$\rarr$ BaCO3(s)+ 2 NaC2H3O2(aq)

Accepted Answer

Question 10

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 11

Which of the following equations does not represent an oxidation-reduction reaction?

Accepted Answer

A) 3Al + 6HCl $\rarr$0 3H2 + AlCl3 
B) 2H2O $\rarr$ 2H2 + O2 
C) 2NaCl + Pb(NO3)2 $\rarr$ PbCl2 + 3NaNO3 
D) 2NaI + Br2 $\rarr$ 2NaBr + I2 
E) Cu(NO3)2 + Zn $\rarr$ Zn(NO3)2 + Cu 
A) 3Al + 6HCl $\rarr$0 3H2 + AlCl3 
B) 2H2O $\rarr$ 2H2 + O2 
C) 2NaCl + Pb(NO3)2 $\rarr$ PbCl2 + 3NaNO3 
D) 2NaI + Br2 $\rarr$ 2NaBr + I2 
E) Cu(NO3)2 + Zn $\rarr$ Zn(NO3)2 + Cu

Question 12

A 430.mL solution of 0.230 M HBr(aq)is mixed with a solution of 225 mL of 0.350 M HClO4(aq).How many moles of H+(aq)are present in the final solution?

Accepted Answer

A) 0.0989 moles H+ 
B) 0.0888 moles H+ 
C) 0.290 moles H+ 
D) 0.178 moles H+ 
E) 0.271 moles H+ 
A) 0.0989 moles H+ 
B) 0.0888 moles H+ 
C) 0.290 moles H+ 
D) 0.178 moles H+ 
E) 0.271 moles H+

Question 13

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 14

Categorize the following reaction as an acid-base neutralization, precipitation, combination, decomposition, combustion, displacement, or disproportionation reaction.
2KClO3(s)$\rarr$2KCl(s)+ 3O2(g)

Accepted Answer

Question 15

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

Accepted Answer

Question 16

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

Accepted Answer

Question 17

The distinguishing characteristic of all electrolyte solutions is that they

Accepted Answer

A) contain molecules. 
B) conduct electricity. 
C) react with other solutions. 
D) always contain acids. 
E) conduct heat. 
A) contain molecules. 
B) conduct electricity. 
C) react with other solutions. 
D) always contain acids. 
E) conduct heat.

Question 18

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 19

Identify the precipitate(s)formed when solutions of Na2SO4(aq), Ba(NO3)2(aq), and NH4ClO4(aq)are mixed.

Accepted Answer

A) Ba(ClO4)2 
B) BaSO4 and (NH4)2SO4 
C) NH4NO3 and NaClO4 
D) BaSO4 
E) NaClO4 
A) Ba(ClO4)2 
B) BaSO4 and (NH4)2SO4 
C) NH4NO3 and NaClO4 
D) BaSO4 
E) NaClO4

Question 20

Identify the precipitate(s)formed when solutions of Pb(NO3)2(aq), Mg(ClO4)2(aq), and (NH4)2SO4(aq)are mixed.

Accepted Answer

A) PbSO4 
B) MgSO4 
C) NH4ClO4 
D) NH4NO3 and NH4ClO4 
E) PbSO4 and MgSO4 
A) PbSO4 
B) MgSO4 
C) NH4ClO4 
D) NH4NO3 and NH4ClO4 
E) PbSO4 and MgSO4

Exam 4: Reactions in Aqueous Solutions

The highest possible oxidation number of nitrogen is

Identify the following compound as a strong electrolyte, weak electrolyte, or nonelectrolyte: NH3.

Identify the following compound as a strong electrolyte, weak electrolyte, or nonelectrolyte: Al(NO3)3

When solid iron(II)hydroxide is added to water, the resulting solution contains 1.4×10-3g of dissolved iron(II)hydroxide per liter of solution.What is the hydroxide ion concentration in this solution?

Determine the oxidation number of each of the elements in NaAl(OH)4?

Write the balanced molecular and net ionic equations for the reaction that would occur between CuCl2(aq)and Pb(s).Be sure to include the correct states in your final equations.If no reaction is expected, write "no reaction."

Identify the correct net ionic equation for the reaction that occurs when solutions of HF and KOH are mixed.

Categorize the following reaction as an acid-base neutralization, precipitation, combination, decomposition, combustion, displacement, or disproportionation reaction. Ba(C2H3O2)2(aq)+ Na2CO3(aq) →\rarr→ BaCO3(s)+ 2 NaC2H3O2(aq)

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?

Which of the following equations does not represent an oxidation-reduction reaction?

A 430.mL solution of 0.230 M HBr(aq)is mixed with a solution of 225 mL of 0.350 M HClO4(aq).How many moles of H+(aq)are present in the final solution?

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

Categorize the following reaction as an acid-base neutralization, precipitation, combination, decomposition, combustion, displacement, or disproportionation reaction. 2KClO3(s) →\rarr→ 2KCl(s)+ 3O2(g)

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

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

The distinguishing characteristic of all electrolyte solutions is that they

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

Identify the precipitate(s)formed when solutions of Na2SO4(aq), Ba(NO3)2(aq), and NH4ClO4(aq)are mixed.

Identify the precipitate(s)formed when solutions of Pb(NO3)2(aq), Mg(ClO4)2(aq), and (NH4)2SO4(aq)are mixed.

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 Orbitals

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 Metal Chemistry and Coordination Compounds

Organic Chemistry

Synthetic and Natural Organic Polymers

Filters

Identify the following compound as a strong electrolyte, weak electrolyte, or nonelectrolyte: NH₃.

Identify the following compound as a strong electrolyte, weak electrolyte, or nonelectrolyte: Al(NO₃)₃

When solid iron(II)hydroxide is added to water, the resulting solution contains 1.4×10^-3g of dissolved iron(II)hydroxide per liter of solution.What is the hydroxide ion concentration in this solution?

Determine the oxidation number of each of the elements in NaAl(OH)₄?

Write the balanced molecular and net ionic equations for the reaction that would occur between CuCl₂(aq)and Pb(s).Be sure to include the correct states in your final equations.If no reaction is expected, write "no reaction."

Categorize the following reaction as an acid-base neutralization, precipitation, combination, decomposition, combustion, displacement, or disproportionation reaction. Ba(C₂H₃O₂)₂(aq)+ Na₂CO₃(aq) $\rarr$ BaCO₃(s)+ 2 NaC₂H₃O₂(aq)

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?

A 430.mL solution of 0.230 M HBr(aq)is mixed with a solution of 225 mL of 0.350 M HClO₄(aq).How many moles of H⁺(aq)are present in the final solution?

Categorize the following reaction as an acid-base neutralization, precipitation, combination, decomposition, combustion, displacement, or disproportionation reaction. 2KClO₃(s) $\rarr$ 2KCl(s)+ 3O₂(g)

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

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

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

Identify the precipitate(s)formed when solutions of Na₂SO₄(aq), Ba(NO₃)₂(aq), and NH₄ClO₄(aq)are mixed.

Identify the precipitate(s)formed when solutions of Pb(NO₃)₂(aq), Mg(ClO₄)₂(aq), and (NH₄)₂SO₄(aq)are mixed.