Question 1

What are the required coefficients to properly balance the following chemical reaction?
 Cu(s)+ S(s)→ Cu2S(s)

Accepted Answer

A) 1, 1,   
B) 1, 1, 1 
C) 1, 1, 2 
D) 2, 1, 1 
E) 2, 1, 2 
A) 1, 1,   
B) 1, 1, 1 
C) 1, 1, 2 
D) 2, 1, 1 
E) 2, 1, 2

Question 2

Determine the oxidation state of P in PO33-.

Accepted Answer

A) +3 
B) +6 
C) +2 
D) 0 
E) -3 
A) +3 
B) +6 
C) +2 
D) 0 
E) -3

Question 3

Choose the statement below that is TRUE.

Accepted Answer

A) A weak acid solution consists of mostly nonionized acid molecules. 
B) The term "strong electrolyte" means that the substance is extremely reactive. 
C) A strong acid solution consists of only partially ionized acid molecules. 
D) The term "weak electrolyte" means that the substance is inert. 
E) A molecular compound that does not ionize in solution is considered a strong electrolyte. 
A) A weak acid solution consists of mostly nonionized acid molecules. 
B) The term "strong electrolyte" means that the substance is extremely reactive. 
C) A strong acid solution consists of only partially ionized acid molecules. 
D) The term "weak electrolyte" means that the substance is inert. 
E) A molecular compound that does not ionize in solution is considered a strong electrolyte.

Question 4

According to the following reaction, how many grams of sulfur are formed when 37.4 g of water are formed? 2H2S(g)+ SO2(g)→ 3S(s)+ 2H2O(l)

Accepted Answer

A) 99.8 g S 
B) 66.6 g S 
C) 56.1 g S 
D) 44.4 g S 
E) 14.0 g S 
A) 99.8 g S 
B) 66.6 g S 
C) 56.1 g S 
D) 44.4 g S 
E) 14.0 g S

Question 5

If 294 grams of FeS2 is allowed to react with 176 grams of O2 according to the following unbalanced equation, how many grams of Fe2O3 are produced?
FeS2 + O2 → Fe2O3 + SO2

Accepted Answer

Question 6

Which of the following compounds is an Arrhenius base?

Accepted Answer

A) CH3OH 
B) CH3CO2H 
C) HOCl 
D) CsOH 
A) CH3OH 
B) CH3CO2H 
C) HOCl 
D) CsOH

Question 7

What are the required coefficients to properly balance the following chemical reaction?
 PbS(s)+ HBr(aq)→ PbBr2(s)+ H2S(g)

Accepted Answer

A) 1, 1, 2, 2 
B) 1, 2, 1, 1 
C) 1, 2, 2, 1 
D) 2, 1, 1, 1 
E) 2, 2, 1, 2 
A) 1, 1, 2, 2 
B) 1, 2, 1, 1 
C) 1, 2, 2, 1 
D) 2, 1, 1, 1 
E) 2, 2, 1, 2

Question 8

Determine the oxidizing agent in the following reaction. 
Ni(s)+ 2AgClO4(aq)→ Ni(ClO4)2(aq)+ 2Ag(s)

Accepted Answer

A) Ag 
B) Ni 
C) Cl 
D) O 
E) This is not an oxidation-reduction reaction. 
A) Ag 
B) Ni 
C) Cl 
D) O 
E) This is not an oxidation-reduction reaction.

Question 9

What are the required coefficients to properly balance the following chemical reaction? 
H2(g)+ Cl2(g)→ HCl(g)

Accepted Answer

A) 1, 1, 2 
B) 2, 2,   
C) 1, 1, 1 
D) 2, 1, 2 
E) 1, 2, 1 
A) 1, 1, 2 
B) 2, 2,   
C) 1, 1, 1 
D) 2, 1, 2 
E) 1, 2, 1

Question 10

Determine the number of grams H2 formed when 250.0 mL of 0.743 mol L-1 HCl solution reacts with 3.41 × 1023 atoms of Fe according to the following reaction: 2HCl(aq)+ Fe(s)→ H2(g)+ FeCl2(aq)

Accepted Answer

A) 0.374 g 
B) 1.33 g 
C) 1.14 g 
D) 0.187 g 
E) 1.51 g 
A) 0.374 g 
B) 1.33 g 
C) 1.14 g 
D) 0.187 g 
E) 1.51 g

What are the required coefficients to properly balance the following chemical reaction? Cu(s)+ S(s)→ Cu₂S(s)

Determine the oxidation state of P in PO₃^3-.

Choose the statement below that is TRUE.

According to the following reaction, how many grams of sulfur are formed when 37.4 g of water are formed? 2H₂S(g)+ SO₂(g)→ 3S(s)+ 2H₂O(l)

If 294 grams of FeS₂ is allowed to react with 176 grams of O₂ according to the following unbalanced equation, how many grams of Fe₂O₃ are produced? FeS₂ + O₂ → Fe₂O₃ + SO₂

Which of the following compounds is an Arrhenius base?

What are the required coefficients to properly balance the following chemical reaction? PbS(s)+ HBr(aq)→ PbBr₂(s)+ H₂S(g)

Determine the oxidizing agent in the following reaction. Ni(s)+ 2AgClO₄(aq)→ Ni(ClO₄)₂(aq)+ 2Ag(s)

What are the required coefficients to properly balance the following chemical reaction? H₂(g)+ Cl₂(g)→ HCl(g)

Determine the number of grams H₂ formed when 250.0 mL of 0.743 mol L^-1 HCl solution reacts with 3.41 × 10²³ atoms of Fe according to the following reaction: 2HCl(aq)+ Fe(s)→ H₂(g)+ FeCl₂(aq)

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 Metallury

Transition Metals and Coordination Compounds

Filters

Exam 4: Chemical Reactions and Stoichiometry

What are the required coefficients to properly balance the following chemical reaction? Cu(s)+ S(s)→ Cu2S(s)

Determine the oxidation state of P in PO33-.

Choose the statement below that is TRUE.

According to the following reaction, how many grams of sulfur are formed when 37.4 g of water are formed? 2H2S(g)+ SO2(g)→ 3S(s)+ 2H2O(l)

If 294 grams of FeS2 is allowed to react with 176 grams of O2 according to the following unbalanced equation, how many grams of Fe2O3 are produced? FeS2 + O2 → Fe2O3 + SO2

Which of the following compounds is an Arrhenius base?

What are the required coefficients to properly balance the following chemical reaction? PbS(s)+ HBr(aq)→ PbBr2(s)+ H2S(g)

Determine the oxidizing agent in the following reaction. Ni(s)+ 2AgClO4(aq)→ Ni(ClO4)2(aq)+ 2Ag(s)

What are the required coefficients to properly balance the following chemical reaction? H2(g)+ Cl2(g)→ HCl(g)

Determine the number of grams H2 formed when 250.0 mL of 0.743 mol L-1 HCl solution reacts with 3.41 × 1023 atoms of Fe according to the following reaction: 2HCl(aq)+ Fe(s)→ H2(g)+ FeCl2(aq)

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 Metallury

Transition Metals and Coordination Compounds

Filters

What are the required coefficients to properly balance the following chemical reaction? Cu(s)+ S(s)→ Cu₂S(s)

Determine the oxidation state of P in PO₃^3-.

According to the following reaction, how many grams of sulfur are formed when 37.4 g of water are formed? 2H₂S(g)+ SO₂(g)→ 3S(s)+ 2H₂O(l)

If 294 grams of FeS₂ is allowed to react with 176 grams of O₂ according to the following unbalanced equation, how many grams of Fe₂O₃ are produced? FeS₂ + O₂ → Fe₂O₃ + SO₂

What are the required coefficients to properly balance the following chemical reaction? PbS(s)+ HBr(aq)→ PbBr₂(s)+ H₂S(g)

Determine the oxidizing agent in the following reaction. Ni(s)+ 2AgClO₄(aq)→ Ni(ClO₄)₂(aq)+ 2Ag(s)

What are the required coefficients to properly balance the following chemical reaction? H₂(g)+ Cl₂(g)→ HCl(g)

Determine the number of grams H₂ formed when 250.0 mL of 0.743 mol L^-1 HCl solution reacts with 3.41 × 10²³ atoms of Fe according to the following reaction: 2HCl(aq)+ Fe(s)→ H₂(g)+ FeCl₂(aq)