Question 1

What mass of Li3PO4 is needed to prepare 500.mL of a solution having a lithium ion concentration of 0.175 M?

Accepted Answer

A) 6.75 g 
B) 10.1 g 
C) 19.3 g 
D) 30.4 g 
E) 3.38 g 
A) 6.75 g 
B) 10.1 g 
C) 19.3 g 
D) 30.4 g 
E) 3.38 g

Question 2

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 3

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 4

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 balanced chemical equation for this reaction.

Accepted Answer

Cu(s)+ 2Ag

Question 5

A weak acid or a weak base ionizes completely.

Accepted Answer

A) True 
 B)False

Question 6

Based on the solubility rules, which one 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 7

Name and give the formulas for six strong acids.

Accepted Answer

hydrochloric acid, HCl; hydrob

Question 8

Determine the oxidation number of each of the elements in K2TaF7?

Accepted Answer

the oxidation number

Question 9

The oxidation number of Fe in K3Fe(CN)6 is

Accepted Answer

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

Question 10

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 11

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 12

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 13

Identify the element being oxidized in the following reaction.
2KBr + F2 $\rarr$Br2 + 2KF

Accepted Answer

Question 14

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 15

Which of the following represents a combustion reaction?

Accepted Answer

A) 2C2H6(g)+ 7O2(g)$\rarr$4CO2(g)+ 6H2O(l) 
B) LiOH(aq)+ HNO3(aq) $\rarr$LiNO3(aq)+ H2O(l) 
C) N2(g)+ 3H2(g)$\rarr$2NH3(g) 
D) 2Na(s)+ 2H2O(l)$\rarr$2NaOH(aq)+ H2(g) 
E) 2Al(s)+ 3H2SO4(aq)$\rarr$Al2(SO4)3(aq)+ 3H2(g) 
A) 2C2H6(g)+ 7O2(g)$\rarr$4CO2(g)+ 6H2O(l) 
B) LiOH(aq)+ HNO3(aq) $\rarr$LiNO3(aq)+ H2O(l) 
C) N2(g)+ 3H2(g)$\rarr$2NH3(g) 
D) 2Na(s)+ 2H2O(l)$\rarr$2NaOH(aq)+ H2(g) 
E) 2Al(s)+ 3H2SO4(aq)$\rarr$Al2(SO4)3(aq)+ 3H2(g)

Question 16

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

Accepted Answer

Question 17

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

Accepted Answer

Question 18

What element is oxidized in the following chemical reaction? H2SO4 + Cd(OH)2 $\rarr$2H2O + CdSO4

Accepted Answer

A) H 
B) S 
C) O 
D) Cd 
E) this is not a redox reaction 
A) H 
B) S 
C) O 
D) Cd 
E) this is not a redox reaction

Question 19

Identify the following compound as a strong electrolyte, weak electrolyte, or nonelectrolyte: CH3OH (methanol).

Accepted Answer

Question 20

Identify the following compound as an electrolyte or nonelectrolyte: Methanol (CH3OH).

Accepted Answer

Exam 4: Reactions in Aqueous Solution

What mass of Li3PO4 is needed to prepare 500.mL of a solution having a lithium ion concentration of 0.175 M?

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

A weak acid or a weak base ionizes completely.

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

Name and give the formulas for six strong acids.

Determine the oxidation number of each of the elements in K2TaF7?

The oxidation number of Fe in K3Fe(CN)6 is

The oxidation number of S in K2SO4 is

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

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?

Identify the element being oxidized in the following reaction. 2KBr + F2 →\rarr→ Br2 + 2KF

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?

Which of the following represents a combustion reaction?

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

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

What element is oxidized in the following chemical reaction? H2SO4 + Cd(OH)2 →\rarr→ 2H2O + CdSO4

Identify the following compound as a strong electrolyte, weak electrolyte, or nonelectrolyte: CH3OH (methanol).

Identify the following compound as an electrolyte or nonelectrolyte: Methanol (CH3OH).

Chemistry: The Study of Change

Atoms, Molecules, and Ions

Mass Relationships in Chemical Reactions

Gases

Thermo-Chemistry

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

Chemistry in the Atmosphere

Entropy, Free Energy, and Equilibrium

Electrochemistry

Metallurgy and the Chemistry of Metals

Nonmetallic Elements and Their Compounds

Transition Metal Chemistry and Coordination Compounds

Nuclear Chemistry

Organic Chemistry

Synthetic and Natural Organic Polymers

Filters

What mass of Li₃PO₄ is needed to prepare 500.mL of a solution having a lithium ion concentration of 0.175 M?

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

Determine the oxidation number of each of the elements in K₂TaF₇?

The oxidation number of Fe in K₃Fe(CN)₆ is

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?

Identify the element being oxidized in the following reaction. 2KBr + F₂ $\rarr$ Br₂ + 2KF

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

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

What element is oxidized in the following chemical reaction? H₂SO₄ + Cd(OH)₂ $\rarr$ 2H₂O + CdSO₄

Identify the following compound as a strong electrolyte, weak electrolyte, or nonelectrolyte: CH₃OH (methanol).

Identify the following compound as an electrolyte or nonelectrolyte: Methanol (CH₃OH).