Question 1

Identify the element being oxidized in the following reaction.
4Al + 3O2 $\rarr$ 2Al2O3

Accepted Answer

The answer of Identify the element being oxidized in the...

Question 2

What is the correct formula of the salt formed in the neutralization reaction of hydrochloric acid with calcium hydroxide?

Accepted Answer

A) CaO 
B) CaCl2 
C) CaH2 
D) CaCl 
E) CaClH 
A) CaO 
B) CaCl2 
C) CaH2 
D) CaCl 
E) CaClH

Question 3

In the following redox reaction 4NH3 + 3Ca(ClO)2 $\rarr$ 2N2 + 6H2O + 3CaCl2
Which element is oxidized and which is reduced?

Accepted Answer

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

Question 4

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 5

Identify the following as either a good or poor conductor of electricity: a crystal of Na2SO4.

Accepted Answer

Question 6

Identify the major ionic species present in an aqueous solution of H2SO4.

Accepted Answer

A) S6+, O36- (plus H2O as a neutral species) 
B) H+, OH-, S6+, 3O2- 
C) 2H+, S6+, 4O2- 
D) H+, HSO4- 
E) 2H+, SO42- 
A) S6+, O36- (plus H2O as a neutral species) 
B) H+, OH-, S6+, 3O2- 
C) 2H+, S6+, 4O2- 
D) H+, HSO4- 
E) 2H+, SO42-

Question 7

The following reaction is an acid-base neutralization reaction.
H2SO4(aq)+ CaBr2(aq) $\rarr$CaSO4(s)+ 2HBr(g)

Accepted Answer

A) True 
 B)False

Question 8

A 250. mL sample of 0.0328M HCl is partially neutralized by the addition of 100. mL of 0.0245M NaOH. Find the concentration of hydrochloric acid in the resulting solution.

Accepted Answer

A) 0.00700 M 
B) 0.0164 M 
C) 0.0383 M 
D) 0.0230 M 
E) 0.0575 M 
A) 0.00700 M 
B) 0.0164 M 
C) 0.0383 M 
D) 0.0230 M 
E) 0.0575 M

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

A 50.0 mL sample of 0.436 M NH4NO3 is diluted with water to a total volume of 250.0 mL. What is the ammonium nitrate concentration in the resulting solution?

Accepted Answer

A) 21.8 M 
B) 0.459 M 
C) 2.18 * 10-2 M 
D) 8.72 * 10-2 M 
E) 0.109 M 
A) 21.8 M 
B) 0.459 M 
C) 2.18 * 10-2 M 
D) 8.72 * 10-2 M 
E) 0.109 M

Question 11

The following reaction is a redox reaction.
CaC2(s)+ H2O(l) $\rarr$ HCCH(g)+ CaO(s)

Accepted Answer

A) True 
 B)False

Question 12

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 13

Sugar dissolves in water, therefore it is a strong electrolyte.

Accepted Answer

A) True 
 B)False

Question 14

Identify the oxidizing agent in the following reaction.
2KBr + F2 $\rarr$ Br2 + 2KF

Accepted Answer

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

Question 15

Identify the reducing agent in the following reaction.
2KBr + F2$\rarr$Br2 + 2KF

Accepted Answer

Br<sup>-</

Question 16

The highest possible oxidation number of carbon is

Accepted Answer

A) +8. 
B) +6. 
C) +4. 
D) +2. 
E) -4. 
A) +8. 
B) +6. 
C) +4. 
D) +2. 
E) -4.

Question 17

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 18

When 38.0 mL of 0.1250 M H2SO4 is added to 100. mL of a solution of PbI2, a precipitate of PbSO4 forms. The PbSO4 is then filtered from the solution, dried, and weighed. If the recovered PbSO4 is found to have a mass of 0.0471 g, what was the concentration of iodide ions in the original solution?

Accepted Answer

A) 3.10 * 10-4 M 
B) 1.55* 10-4 M 
C) 6.20 * 10-3 M 
D) 3.11 * 10-3 M 
E) 1.55 * 10-3 M 
A) 3.10 * 10-4 M 
B) 1.55* 10-4 M 
C) 6.20 * 10-3 M 
D) 3.11 * 10-3 M 
E) 1.55 * 10-3 M

Question 19

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

Accepted Answer

A) NaCl 
B) MgBr2 
C) FeCl2 
D) AgBr 
E) ZnCl2 
A) NaCl 
B) MgBr2 
C) FeCl2 
D) AgBr 
E) ZnCl2

Question 20

Based on the solubility rules, which one 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

Exam 4: Reactions in Aqueous Solution

Identify the element being oxidized in the following reaction. 4Al + 3O2 →\rarr→ 2Al2O3

What is the correct formula of the salt formed in the neutralization reaction of hydrochloric acid with calcium hydroxide?

In the following redox reaction 4NH3 + 3Ca(ClO)2 →\rarr→ 2N2 + 6H2O + 3CaCl2 Which element is oxidized and which is reduced?

The oxidation number of Cl in ClO3- is

Identify the following as either a good or poor conductor of electricity: a crystal of Na2SO4.

Identify the major ionic species present in an aqueous solution of H2SO4.

The following reaction is an acid-base neutralization reaction. H2SO4(aq)+ CaBr2(aq) →\rarr→ CaSO4(s)+ 2HBr(g)

A 250. mL sample of 0.0328M HCl is partially neutralized by the addition of 100. mL of 0.0245M NaOH. Find the concentration of hydrochloric acid in the resulting solution.

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

A 50.0 mL sample of 0.436 M NH4NO3 is diluted with water to a total volume of 250.0 mL. What is the ammonium nitrate concentration in the resulting solution?

The following reaction is a redox reaction. CaC2(s)+ H2O(l) →\rarr→ HCCH(g)+ CaO(s)

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?

Sugar dissolves in water, therefore it is a strong electrolyte.

Identify the oxidizing agent in the following reaction. 2KBr + F2 →\rarr→ Br2 + 2KF

Identify the reducing agent in the following reaction. 2KBr + F2 →\rarr→ Br2 + 2KF

The highest possible oxidation number of carbon is

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?

When 38.0 mL of 0.1250 M H2SO4 is added to 100. mL of a solution of PbI2, a precipitate of PbSO4 forms. The PbSO4 is then filtered from the solution, dried, and weighed. If the recovered PbSO4 is found to have a mass of 0.0471 g, what was the concentration of iodide ions in the original solution?

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

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

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

Identify the element being oxidized in the following reaction. 4Al + 3O₂ $\rarr$ 2Al₂O₃

In the following redox reaction 4NH₃ + 3Ca(ClO)₂ $\rarr$ 2N₂ + 6H₂O + 3CaCl₂ Which element is oxidized and which is reduced?

The oxidation number of Cl in ClO₃^- is

Identify the following as either a good or poor conductor of electricity: a crystal of Na₂SO₄.

Identify the major ionic species present in an aqueous solution of H₂SO₄.

The following reaction is an acid-base neutralization reaction. H₂SO₄(aq)+ CaBr₂(aq) $\rarr$ CaSO₄(s)+ 2HBr(g)

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

A 50.0 mL sample of 0.436 M NH₄NO₃ is diluted with water to a total volume of 250.0 mL. What is the ammonium nitrate concentration in the resulting solution?

The following reaction is a redox reaction. CaC₂(s)+ H₂O(l) $\rarr$ HCCH(g)+ CaO(s)

Identify the oxidizing agent in the following reaction. 2KBr + F₂ $\rarr$ Br₂ + 2KF

Identify the reducing agent in the following reaction. 2KBr + F₂ $\rarr$ Br₂ + 2KF

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?