Question 1

KMnO4 in acidic media is a powerful oxidizing agent, which is often used in redox titrations.

Accepted Answer

A) True 
 B)False

Question 2

A solution was made by taking 2.500 g of KMnO4 and dissolving it in enough water to make 1.000 liter of solution. This solution was used to titrate H2C2O4·2H2O, which can be readily obtained in high purity. In acidic media, the reaction is:2 MnO4-(aq)+ 5 H2C2O4(aq)+ 6 H+ → 10 CO2(g)+ 2 Mn2+(aq)+ 8 H2O How many mL of this solution are required to titrate a 0.480 g sample of H2C2O4·2H2O? Hint: Remember to use moles as an intermediary when performing your stoichiometry calculations for the titration.

Accepted Answer

Question 3

What two products are formed when CH4 reacts with a very limited supply of molecular oxygen? Hint: Oxygen must be conserved in the products.

Accepted Answer

Question 4

What is the oxidation number of the arsenic atom in the AsO43 ion?

Accepted Answer

A) +1 
B) +3 
C) +4 
D) +5 
E) +6 
A) +1 
B) +3 
C) +4 
D) +5 
E) +6

Question 5

Which substance in the reaction 5 H2O(l)+ 4 Cl2(g)+ S2O32-(aq)→ 2 SO42-(aq)+ 8 Cl-(aq)+ 10 H+(aq)is the reducing agent?

Accepted Answer

Question 6

Identify the reducing agent in the chemical reaction Cd + NiO2 + 2H2O → Cd(OH)2 + Ni(OH)2.

Accepted Answer

Question 7

The activity series of metals is Au < Ag < Cu < Sn < Cd < Zn < Al < Mg < Na < Cs Which reaction below occurs spontaneously upon mixing the reagents shown?

Accepted Answer

A) Sn(s)+ Zn2+(aq)$\rarr$Sn2+(aq)+ Zn(s) 
B) Ag(s)+ Mg2+(aq)$\rarr$ Ag+(aq)+ Mg(s) 
C) Zn(s)+ Au3+(aq)$\rarr$Zn2+(aq)+ Au(s) 
D) Ag(s)+ Zn2+(aq)$\rarr$ Ag+(aq)+ Zn(s) 
E) Sn(s)+ Al3+(aq)$\rarr$Sn2+(aq)+ Al(s) 
A) Sn(s)+ Zn2+(aq)$\rarr$Sn2+(aq)+ Zn(s) 
B) Ag(s)+ Mg2+(aq)$\rarr$ Ag+(aq)+ Mg(s) 
C) Zn(s)+ Au3+(aq)$\rarr$Zn2+(aq)+ Au(s) 
D) Ag(s)+ Zn2+(aq)$\rarr$ Ag+(aq)+ Zn(s) 
E) Sn(s)+ Al3+(aq)$\rarr$Sn2+(aq)+ Al(s)

Question 8

The activity series of metals is Au < Ag < Cu < Sn < Cd < Zn < Al < Mg < Na < Cs Which reaction below does not occur spontaneously upon mixing the reagents shown?

Accepted Answer

A) Cd(s)+ Al3+(aq)$\rarr$ Cd2+(aq)+ Al(s) 
B) Cd(s)+ Cu2+(aq)$\rarr$ Cd2+(aq)+ Cu(s) 
C) Zn(s)+ Cu2+(aq)$\rarr$ Zn2+(aq)+ Cu(s) 
D) Al(s)+ Ag+(aq)$\rarr$Al3+(aq)+ Ag(s) 
E) Cu(s)+ Au3+(aq)$\rarr$ Cu2+(aq)+ Au(s) 
A) Cd(s)+ Al3+(aq)$\rarr$ Cd2+(aq)+ Al(s) 
B) Cd(s)+ Cu2+(aq)$\rarr$ Cd2+(aq)+ Cu(s) 
C) Zn(s)+ Cu2+(aq)$\rarr$ Zn2+(aq)+ Cu(s) 
D) Al(s)+ Ag+(aq)$\rarr$Al3+(aq)+ Ag(s) 
E) Cu(s)+ Au3+(aq)$\rarr$ Cu2+(aq)+ Au(s)

Question 9

A partial activity series of metals is: Au 3+, Pb2+, Ag+?

Accepted Answer

Question 10

Which element would react most rapidly with water?

Accepted Answer

A) K 
B) Cd 
C) Cs 
D) Na 
E) Zn 
A) K 
B) Cd 
C) Cs 
D) Na 
E) Zn

Question 11

Three metallic elements, copper, magnesium and gold, can be distinguished from one another on the basis of how they react with two strong acids, HNO3(aq)and HCl(aq). Which set below, using the abbreviations R (for reaction occurs)and NR (no reaction)correctly describes what occurs?

Accepted Answer

Question 12

A partial activity series is: Au 2 3)2(aq); Fe(NO3)2(aq); HNO3(aq); Cu(NO3)2(aq); Sn(NO3)2(aq)?

Accepted Answer

Question 13

When organic compounds that contain sulfur undergo complete combustion with oxygen, one of the products is hydrogen sulfide.

Accepted Answer

A) True 
 B)False

Question 14

You can dissolve a penny using nitric acid, HNO3. The reaction 
Cu(s)+ 4 HNO3(aq)$\rarr$Cu(NO3)2(aq)+ 2 NO2(g)+ 2 H2O(l)is used to dissolve copper metal. If there is 1.000 g of copper to be dissolved, and instructions say to use four times as much acid as the required amount, how many mL (to the nearest mL)of 15.0 M nitric acid would be required to dissolve the copper? Hint: Don't forget the coefficients in the balanced reaction above when performing your calculations with nitric acid.

Accepted Answer

A) 4 mL 
B) 5 mL 
C) 10 mL 
D) 17 mL 
E) 25 mL 
A) 4 mL 
B) 5 mL 
C) 10 mL 
D) 17 mL 
E) 25 mL

Question 15

Which statement is true concerning an oxidation-reduction reaction?

Accepted Answer

A) The reactant which is reduced is the oxidizing agent. 
B) The reactant which is oxidized is the oxidizing reagent. 
C) The reactant which gains electrons is the reducing agent. 
D) The reactant which loses electrons is the oxidizing agent. 
E) None of the statements, A-D, is true. 
A) The reactant which is reduced is the oxidizing agent. 
B) The reactant which is oxidized is the oxidizing reagent. 
C) The reactant which gains electrons is the reducing agent. 
D) The reactant which loses electrons is the oxidizing agent. 
E) None of the statements, A-D, is true.

Question 16

The activity series of metals is Au < Ag < Cu < Sn < Cd < Zn < Al < Mg < Na < Cs Based on this list, which element below would undergo oxidation least readily?

Accepted Answer

A) Mg 
B) Al 
C) Cu 
D) Cd 
E) Zn 
A) Mg 
B) Al 
C) Cu 
D) Cd 
E) Zn

Question 17

Balancing a redox reaction in acidic media is no different than balancing the same reaction in a basic media.

Accepted Answer

A) True 
 B)False

Question 18

The activity series of metals is Au < Ag < Cu < Sn < Cd < Zn < Al < Mg < Na < Cs Based on this list, which element below would undergo oxidation most readily?

Accepted Answer

A) Ag 
B) Al 
C) Cu 
D) Cd 
E) Zn 
A) Ag 
B) Al 
C) Cu 
D) Cd 
E) Zn

Question 19

When aluminum is exposed to the environment it does not corrode in the same way as iron. Which of the following best explains why? Hint: Look at the chemical properties of iron and aluminum.

Accepted Answer

A) Aluminum quickly oxidizes at the surface and forms a protective coating that prevents further oxidation. 
B) Aluminum is not as reactive as iron, and does not react with molecular oxygen. 
C) Aluminum is not easily reduced, so it is not reduced by exposure to oxygen. 
D) Aluminum normally treated with a polymer coating that prevents oxidation. 
E) Aluminum reacts with water to form a hydride coating that protects the rest of the aluminum from oxidation. 
A) Aluminum quickly oxidizes at the surface and forms a protective coating that prevents further oxidation. 
B) Aluminum is not as reactive as iron, and does not react with molecular oxygen. 
C) Aluminum is not easily reduced, so it is not reduced by exposure to oxygen. 
D) Aluminum normally treated with a polymer coating that prevents oxidation. 
E) Aluminum reacts with water to form a hydride coating that protects the rest of the aluminum from oxidation.

Question 20

When a metal is reacted with nitric acid, which element in nitric acid is reduced?

Accepted Answer

The answer of When a metal is reacted with nitric...

Exam 6: Oxidation-Reduction Reactions

KMnO4 in acidic media is a powerful oxidizing agent, which is often used in redox titrations.

What two products are formed when CH4 reacts with a very limited supply of molecular oxygen? Hint: Oxygen must be conserved in the products.

What is the oxidation number of the arsenic atom in the AsO43 ion?

Which substance in the reaction 5 H2O(l)+ 4 Cl2(g)+ S2O32-(aq)→ 2 SO42-(aq)+ 8 Cl-(aq)+ 10 H+(aq)is the reducing agent?

Identify the reducing agent in the chemical reaction Cd + NiO2 + 2H2O → Cd(OH)2 + Ni(OH)2.

The activity series of metals is Au < Ag < Cu < Sn < Cd < Zn < Al < Mg < Na < Cs Which reaction below occurs spontaneously upon mixing the reagents shown?

The activity series of metals is Au < Ag < Cu < Sn < Cd < Zn < Al < Mg < Na < Cs Which reaction below does not occur spontaneously upon mixing the reagents shown?

A partial activity series of metals is: Au < Ag < Cu < Pb < Sn. Which ion is most easily reduced: Au3+, Pb2+, Ag+?

Which element would react most rapidly with water?

Three metallic elements, copper, magnesium and gold, can be distinguished from one another on the basis of how they react with two strong acids, HNO3(aq)and HCl(aq). Which set below, using the abbreviations R (for reaction occurs)and NR (no reaction)correctly describes what occurs?

A partial activity series is: Au < Ag < Cu < H2 < Pb < Sn < Co < Fe. Which metal will be produced when each of the following compounds reacts with Sn metal:Co(NO3)2(aq); Fe(NO3)2(aq); HNO3(aq); Cu(NO3)2(aq); Sn(NO3)2(aq)?

When organic compounds that contain sulfur undergo complete combustion with oxygen, one of the products is hydrogen sulfide.

Which statement is true concerning an oxidation-reduction reaction?

The activity series of metals is Au < Ag < Cu < Sn < Cd < Zn < Al < Mg < Na < Cs Based on this list, which element below would undergo oxidation least readily?

Balancing a redox reaction in acidic media is no different than balancing the same reaction in a basic media.

The activity series of metals is Au < Ag < Cu < Sn < Cd < Zn < Al < Mg < Na < Cs Based on this list, which element below would undergo oxidation most readily?

When aluminum is exposed to the environment it does not corrode in the same way as iron. Which of the following best explains why? Hint: Look at the chemical properties of iron and aluminum.

When a metal is reacted with nitric acid, which element in nitric acid is reduced?

A Very Brief History of Chemistry

Scientific Measurements

Elements, Compounds, and the Periodic Table

The Mole and Stoichiometry

Molecular View of Reactions in Aqueous Solutions

Energy and Chemical Change

The Quantum Mechanical Atom

The Basics of Chemical Bonding

Theories of Bonding and Structure

Properties of Gases

Intermolecular Attractions and the Properties of Liquids and Solids

Mixtures at the Molecular Level: Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases, a Molecular Look

Acid-Base Equilibria in Aqueous Solutions

Solubility and Simultaneous Equilibria

Thermodynamics

Electrochemistry

Nuclear Reactions and Their Role in Chemistry

Metal Complexes

Organic Compounds, Polymers, and Biochemicals

Filters

KMnO₄ in acidic media is a powerful oxidizing agent, which is often used in redox titrations.

What two products are formed when CH₄ reacts with a very limited supply of molecular oxygen? Hint: Oxygen must be conserved in the products.

What is the oxidation number of the arsenic atom in the AsO₄³ ion?

Which substance in the reaction 5 H₂O(l)+ 4 Cl₂(g)+S₂O₃^2-(aq)→ 2 SO₄^2-(aq)+ 8 Cl^-(aq)+ 10 H⁺(aq)is the reducing agent?

Identify the reducing agent in the chemical reaction Cd + NiO₂ + 2H₂O → Cd(OH)₂ + Ni(OH)₂.

A partial activity series of metals is: Au < Ag < Cu < Pb < Sn. Which ion is most easily reduced: Au³⁺, Pb²⁺, Ag⁺?

Three metallic elements, copper, magnesium and gold, can be distinguished from one another on the basis of how they react with two strong acids, HNO₃(aq)and HCl(aq). Which set below, using the abbreviations R (for reaction occurs)and NR (no reaction)correctly describes what occurs?

A partial activity series is: Au < Ag < Cu < H₂ < Pb < Sn < Co < Fe. Which metal will be produced when each of the following compounds reacts with Sn metal:Co(NO₃)₂(aq); Fe(NO₃)₂(aq); HNO₃(aq); Cu(NO₃)₂(aq); Sn(NO₃)₂(aq)?