Chemistry - 1.7 - Oxidation, Reduction, Redox reactions

Question 1

What is oxidation in terms of electron transfer?

Answer 1

Oxidation is the loss of electrons.

Question 2

What is reduction in terms of electron transfer?

Answer 2

Reduction is the gain of electrons.

Question 3

True or False: In a redox reaction, one species is oxidized while another is reduced.

Answer 3

True

Question 4

What does the term ‘redox’ stand for?

Answer 4

Redox stands for reduction and oxidation.

Question 5

What is the oxidation state of oxygen in most compounds?

Answer 5

-2

Question 6

What is the oxidation state of hydrogen in most compounds?

Answer 6

+1

Question 7

Fill in the blank: A substance that donates electrons is called a __________.

Answer 7

reducing agent

Question 8

Fill in the blank: A substance that accepts electrons is called an __________.

Answer 8

oxidizing agent

Question 9

What is the oxidation state of chlorine in NaCl?

Answer 9

-1

Question 10

What happens to the oxidation state of an element that is oxidized?

Answer 10

The oxidation state increases.

Question 11

What happens to the oxidation state of an element that is reduced?

Answer 11

The oxidation state decreases.

Question 12

What is the oxidation state of carbon in CO2?

Answer 12

+4

Question 13

What is a common example of a redox reaction in everyday life?

Answer 13

Rusting of iron.

Question 14

True or False: Oxidation and reduction can occur independently of each other.

Answer 14

False

Question 15

What is the general equation for a redox reaction?

Answer 15

Oxidation + Reduction → Products

Question 16

What do the terms ‘oxidizing agent’ and ‘reducing agent’ refer to?

Answer 16

Oxidizing agent gains electrons; reducing agent loses electrons.

Question 17

In the reaction 2Mg + O2 → 2MgO, what is being oxidized?

Answer 17

Magnesium (Mg)

Question 18

In the reaction 2Mg + O2 → 2MgO, what is being reduced?

Answer 18

Oxygen (O2)

Question 19

What is the oxidation state of nitrogen in NH3?

Answer 19

-3

Question 20

What is the oxidation state of sulfur in H2SO4?

Answer 20

+6

Question 21

Fill in the blank: A half-equation shows either oxidation or __________.

Answer 21

reduction

Question 22

What is the role of an electron in redox reactions?

Answer 22

Electrons are transferred between species.

Question 23

What is the oxidation state of iron in Fe2O3?

Answer 23

+3

Question 24

What type of reaction is 2H2 + O2 → 2H2O?

Answer 24

A combustion reaction.

Question 25

True or False: In a redox reaction, the total number of electrons lost equals the total number of electrons gained.

Answer 25

True

Question 26

How can you identify a redox reaction?

Answer 26

By tracking changes in oxidation states of the elements involved.

Question 27

What is the oxidation state of potassium in KCl?

Answer 27

+1

Question 28

Identify the reducing agent in the reaction: Zn + Cu²⁺ → Zn²⁺ + Cu.

Answer 28

Zinc (Zn)

Question 29

Identify the oxidizing agent in the reaction: Zn + Cu²⁺ → Zn²⁺ + Cu.

Answer 29

Copper ion (Cu²⁺)

Question 30

What is the oxidation state of phosphorus in H3PO4?

Answer 30

+5

Question 31

Fill in the blank: In a redox reaction, the species that is __________ is oxidized.

Answer 31

losing electrons

Question 32

What is the oxidation state of manganese in KMnO4?

Answer 32

+7

Question 33

What is a disproportionation reaction?

Answer 33

A reaction where a single substance is both oxidized and reduced.

Question 34

In the reaction 4Fe + 3O2 → 2Fe2O3, how many electrons are transferred?

Answer 34

6 electrons per Fe atom.

Question 35

What is the oxidation state of lead in PbO2?

Answer 35

+4

Question 36

Fill in the blank: The process of gaining oxygen or losing hydrogen is known as __________.

Answer 36

oxidation

Question 37

Fill in the blank: The process of losing oxygen or gaining hydrogen is known as __________.

Answer 37

reduction

Question 38

What is the common oxidation state of alkali metals?

Answer 38

+1

Question 39

What is the common oxidation state of alkaline earth metals?

Answer 39

+2

Question 40

True or False: All redox reactions involve oxygen.

Answer 40

False

Question 41

What is the oxidation state of zinc in ZnO?

Answer 41

+2

Question 42

What is the oxidation state of copper in CuO?

Answer 42

+2

Question 43

In a redox reaction, what does the term 'electron transfer' imply?

Answer 43

Electrons are exchanged between reactants.