Question 1

Magnesium burns brightly in the presence of oxygen. When magnesium reacts with oxygen, the compound formed is

Accepted Answer

When magnesium reacts with oxygen, the compound formed is magnesium oxide, which is chemically represented as MgO. This is a simple combination of magnesium (Mg) and oxygen (O) in a 1:1 ratio, forming a basic oxide.

Question 2

The black tarnish on silver is

Accepted Answer

The black tarnish on silver is primarily silver sulfide (Ag2S), which forms when silver reacts with sulfur compounds in the air.

Question 3

Roughly ________% of all iron and steel produced each year is used to replace corroded items.

Accepted Answer

According to the World Steel Association, approximately 20% of all iron and steel produced each year is used to replace corroded items.

Question 4

When metals react with oxygen, they form

Accepted Answer

When metals react with oxygen, they form oxides such as iron oxide (rust) or copper oxide.

Question 5

Which of the following statements about the rusting of iron is true?

Accepted Answer

Rusting of iron is a process of oxidation in which iron reacts with oxygen to form iron oxide or hydroxide. Hence, option B is correct. Option A is incorrect as iron does not undergo reduction during rusting. Option C is incorrect as the protective coating of iron(III) hydroxide is not effective in preventing further rusting. Option D is incorrect as rusting occurs due to the presence of water or moisture.

Question 6

Most chemical explosions are ________ reactions.

Accepted Answer

Most chemical explosions involve oxidation-reduction reactions, where there is a transfer of electrons between reactants leading to a rapid release of energy. Nuclear fission reactions involve the splitting of atomic nuclei, while neutralization reactions involve the combination of an acid and a base to form a salt and water. Condensation reactions involve the joining together of molecules to form a larger molecule with the release of a small molecule such as water.

Question 7

When your car rusts, the major chemical reaction is that between the iron from the steel in the car body with the oxygen from the air to form iron(III) oxide. When the reaction is balanced, the coefficient of iron is

Accepted Answer

The answer of When your car rusts, the major chemical...

Question 8

________ is used as an explosive and a heart medication.

Accepted Answer

Nitroglycerin is used both as an explosive and a heart medication. It can relax the smooth muscle in blood vessels and is commonly used to treat angina. However, it is also highly explosive and can be used in dynamite and other explosives.

Question 9

Aluminum is more reactive than iron, yet it is used today for a variety of applications in which iron would corrode (cans, rain gutters, etc.). The reason for the corrosion durability of aluminum is that

Accepted Answer

When aluminum is exposed to air, it forms a very thin layer of aluminum oxide on its surface. This very thin layer prevents further oxidation which makes aluminum durable.

Question 10

ANFO is an explosive mixture of ammonium nitrate, NH₄NO₃, and fuel oil. When this mixture explodes, the ammonium nitrate undergoes

Accepted Answer

Ammonium nitrate in ANFO acts as an oxidizing agent, meaning it undergoes reduction itself while oxidizing the fuel oil. Thus, in the explosion process, ammonium nitrate undergoes both oxidation and reduction, depending on the part of the reaction you're looking at.

Question 11

With respect to volume, approximately what percentage of the air we breathe is composed of elemental argon?

Accepted Answer

Elemental argon makes up only about 0.93% of the Earth's atmosphere, so it is unlikely that it would compose a large portion of the air we breathe. Therefore, choice B, which suggests that approximately 1% of the air we breathe is composed of elemental argon, is the best choice.

Question 12

Photochromic lenses contain

Accepted Answer

Photochromic lenses contain both silver chloride (AgCl) and copper chloride (CuCl) embedded in the glass. When exposed to UV light, these compounds react and cause the lenses to darken.

Question 13

A mixture of ammonium nitrate (NH₄NO₃) and fuel oil has often been used in terrorist attacks around the world. Which of the following statements is NOT true for this type of explosive mixture?

Accepted Answer

The answer of A mixture of ammonium nitrate (NH₄NO₃) and...

Question 14

The most abundant element (by mass) in the human body is

Accepted Answer

Oxygen is the most abundant element by mass in the human body, making up about 65% of the body's mass.

Question 15

All of the following are commonly involved in explosions EXCEPT

Accepted Answer

While aluminum can burn and cause fires, it is not typically involved in explosions. The other choices are all explosives commonly involved in explosions.

Question 16

The corrosion of metals, such as the rusting of iron, is an example of

Accepted Answer

Corrosion, specifically rusting, involves the reaction of iron with oxygen in the presence of water. This results in the loss of electrons by the iron atoms, which is a characteristic of oxidation. Therefore, the correct choice is B) oxidation.

Question 17

Aluminum is more reactive than iron is, but iron corrodes more quickly. This occurs because

Accepted Answer

Aluminum reacts with oxygen to form a thin layer of aluminum oxide on its surface, which protects the metal from further reaction. This is why aluminum is used extensively in outdoor applications such as window frames and aircraft parts. Iron, on the other hand, does not form a protective oxide layer and is more susceptible to corrosion in the presence of oxygen and water.

Question 18

When silver tarnishes,

Accepted Answer

When silver tarnishes, it reacts with sulfur in the air to form silver sulfide (Ag2S), which is a process of oxidation where Ag atoms lose electrons to form Ag+ ions that then combine with S2- ions to form Ag2S.

Question 19

A battery in which a fuel is oxidized at the anode and oxygen is reduced at the cathode is a(n)

Accepted Answer

The description given matches that of a fuel cell, in which a fuel (such as hydrogen) is oxidized at the anode and oxygen is reduced at the cathode.

Question 20

The removal of silver tarnish from silverware using aluminum foil and a solution of electrolyte is an example of

Accepted Answer

The process involves the oxidation of aluminum metal to aluminum ions, the reduction of silver ions to silver metal, and the overall process constitutes an electrochemical cell where a chemical reaction is driven by an electrical current.

Quiz 8: Oxidation and Reduction

Magnesium burns brightly in the presence of oxygen. When magnesium reacts with oxygen, the compound formed is

The black tarnish on silver is

Roughly ________% of all iron and steel produced each year is used to replace corroded items.

When metals react with oxygen, they form

Which of the following statements about the rusting of iron is true?

Most chemical explosions are ________ reactions.

When your car rusts, the major chemical reaction is that between the iron from the steel in the car body with the oxygen from the air to form iron(III) oxide. When the reaction is balanced, the coefficient of iron is

________ is used as an explosive and a heart medication.

Aluminum is more reactive than iron, yet it is used today for a variety of applications in which iron would corrode (cans, rain gutters, etc.) . The reason for the corrosion durability of aluminum is that

ANFO is an explosive mixture of ammonium nitrate, NH₄NO₃, and fuel oil. When this mixture explodes, the ammonium nitrate undergoes

With respect to volume, approximately what percentage of the air we breathe is composed of elemental argon?

Photochromic lenses contain

A mixture of ammonium nitrate (NH₄NO₃) and fuel oil has often been used in terrorist attacks around the world. Which of the following statements is NOT true for this type of explosive mixture?

The most abundant element (by mass) in the human body is

All of the following are commonly involved in explosions EXCEPT

The corrosion of metals, such as the rusting of iron, is an example of

Aluminum is more reactive than iron is, but iron corrodes more quickly. This occurs because

When silver tarnishes,

A battery in which a fuel is oxidized at the anode and oxygen is reduced at the cathode is a(n)

The removal of silver tarnish from silverware using aluminum foil and a solution of electrolyte is an example of

Quiz 8: Oxidation and Reduction

Magnesium burns brightly in the presence of oxygen. When magnesium reacts with oxygen, the compound formed is

The black tarnish on silver is

Roughly ________% of all iron and steel produced each year is used to replace corroded items.

When metals react with oxygen, they form

Which of the following statements about the rusting of iron is true?

Most chemical explosions are ________ reactions.

When your car rusts, the major chemical reaction is that between the iron from the steel in the car body with the oxygen from the air to form iron(III) oxide. When the reaction is balanced, the coefficient of iron is

________ is used as an explosive and a heart medication.

Aluminum is more reactive than iron, yet it is used today for a variety of applications in which iron would corrode (cans, rain gutters, etc.) . The reason for the corrosion durability of aluminum is that

ANFO is an explosive mixture of ammonium nitrate, NH4NO3, and fuel oil. When this mixture explodes, the ammonium nitrate undergoes

With respect to volume, approximately what percentage of the air we breathe is composed of elemental argon?

Photochromic lenses contain

A mixture of ammonium nitrate (NH4NO3) and fuel oil has often been used in terrorist attacks around the world. Which of the following statements is NOT true for this type of explosive mixture?

The most abundant element (by mass) in the human body is

All of the following are commonly involved in explosions EXCEPT

The corrosion of metals, such as the rusting of iron, is an example of

Aluminum is more reactive than iron is, but iron corrodes more quickly. This occurs because

When silver tarnishes,

A battery in which a fuel is oxidized at the anode and oxygen is reduced at the cathode is a(n)

The removal of silver tarnish from silverware using aluminum foil and a solution of electrolyte is an example of

ANFO is an explosive mixture of ammonium nitrate, NH₄NO₃, and fuel oil. When this mixture explodes, the ammonium nitrate undergoes

A mixture of ammonium nitrate (NH₄NO₃) and fuel oil has often been used in terrorist attacks around the world. Which of the following statements is NOT true for this type of explosive mixture?