Redox

Question 1

What is redox chemistry?

Answer 1

The chemistry of reduction and oxidation reactions

Question 2

In terms of electrons what is oxidation?

Answer 2

Oxidation is the loss of electrons

Question 3

In terms of electrons what is reduction?

Answer 3

Reduction is the gain of electrons

Question 4

What is the pneumonic for remembering what oxidation and reduction is?

Answer 4

OIL - RIG

Oxidation is loss of electrons

Reduction is gain of electrons

Question 5

What is oxidation number?

Answer 5

The charge an atom has in a molecule or ion

Question 6

What is the oxidation number of a pure element?

Answer 6

Zero

Question 7

What is the oxidation number of an ion consisting of a single atom?

Answer 7

Its the charge on the ion

Question 8

What is normally the oxidation state of oxygen?

Answer 8

-2

Question 9

What is normally the oxidation state of hydrogen?

Answer 9

+1

Question 10

What can you use to determine an atoms oxidation number?

Answer 10

It can be determined by looking at an atoms electron configuration

Question 11

In terms of oxidation number, what is oxidation?

Answer 11

Increase in oxidation number

Question 12

In terms of oxidation number, what is reduction?

Answer 12

Decrease in oxidation number

Question 13

What is a reducing agent?

Answer 13

Something that causes the reduction of another substance -> it is oxidised itself

Question 14

What is an oxidation agent?

Answer 14

Something that causes the oxidation of another substance -> it is reduced itself

Question 15

When is the oxidation number of hydrogen not +1?

Answer 15

When hydrogen bonds with metal hydrides e.g. NaH

H = -1

Question 16

When is the oxidation number of oxygen not -2?

Answer 16

When its bound to something more electronegative e.g. fluorine

O = -1

Question 17

What is the oxidation number of Cl, Br and I usually?

Answer 17

-1

Question 18

When are the oxidation numbers of Cl, Br and I not -1?

Answer 18

Oxygen or Fluorine