Unit 3- Redox Reactions

Question 1

Atoms from what area of the periodic table have multiple oxidation states?

Answer 1

Transition metals

Question 2

Can oxidation happen by itself?

Answer 2

No, reduction must also occur

Question 3

Elements in Group 1 and 2 of the periodic table are more likely to - oxidise or reduce?

Answer 3

Oxidise

Question 4

For monoatomic ions, how is the oxidation number determined?

Answer 4

The oxidation number is determined by the charge on the ion Eg, Cu2+ has an oxidation number of +2

Question 5

The sum of the oxidation numbers in a polyatomic ion should equal what?

Answer 5

The charge on the ion

Question 6

What does AN OX represent?

Answer 6

Oxidation always occurs at the anode

Question 7

What does OILRIG stand for?

Answer 7

Oxidation is loss of electrons, reduction is gain of electrons

Question 8

What does RED CAT represent?

Answer 8

Reduction always occurs at the cathode

Question 9

What do oxidation numbers represent?

Answer 9

They represent the gain or loss of electrons.

Question 10

What happens to the oxidation states when the atom undergoes oxidation?

Answer 10

Oxidation states increase

Question 11

What happens to the oxidation states when the atom undergoes reduction?

Answer 11

Oxidation state decreases

Question 12

What is a corrosion reaction?

Answer 12

Process where metal reacts with chemicals in the atmosphere. The metal must be more stable as an ion than a solid

Question 13

What is a half- equation?

Answer 13

An equation that represents either oxidation or reduction

Question 14

What is an overall redox equation made up of?

Answer 14

The oxidation and reduction half equations and added together

Question 15

What is an oxidising agent?

Answer 15

A reactant that causes another reactant to lose electrons and be oxidised and is itself reduced

Question 16

What is a REDOX reaction?

Answer 16

One where both reduction and oxidation occurs simultaneously

Question 17

What is a spectator ion?

Answer 17

An ion that exists in the same state on the reactant and product side of a reaction. Its oxidation state does not change.

Question 18

What is oxidation?

Answer 18

Oxidation is the loss of electrons

Question 19

What is reduction?

Answer 19

Reduction is the gain of electrons

Question 20

What is the common oxidation number of Group 1 metals ?

Answer 20

Group 1 is + 1 Including - Li+, Na+

Question 21

What is the common oxidation number of Group 2 metals?

Answer 21

Group 2 is +2 including - Mg2+, Ca2+

Question 22

What molecule has oxidation number of 0?

Answer 22

Elements including - He, Fe, Li, O2

Question 23

What occurs to a reducing agent?

Answer 23

Oxidation

Question 24

What should be the sum of the oxidation numbers in a neutral compound equal?

Answer 24

zero

Question 25

What type of chemical reactions are redox reactions?

Answer 25

Single displacement, combustion, electrochemical cells, corrosion

Question 26

When elements lose their valence electrons, do they act as oxidising or reducing agents?

Answer 26

The elements are oxidised and act as reducing agents

Question 27

When is Hydrogen’s oxidation number not equal to +1?

Answer 27

In metal hydrides, hydrogen has a oxidation number of -1 Including - LiH

Question 28

When is Oxygen’s oxidation number not equal to -2?

Answer 28

In peroxide (H2O2), oxygen has an oxidation number of -1