Chapter 4

Question 1

Define Oxidation Number?

Answer 1

The number that shows the number of electrons lost/ gained by an atom in bonding with another.

Question 2

What are the 5 oxidation rules?

Answer 2

1. In uncombined elements, Oxidation Number = 0.
2. Certain elements have fixed oxidation numbers
3. In monoatomic ions, the oxidation number = the charge on the ion
4. In neutral compounds the sum of the oxidation number = 0
5. In polyatomic ions, the sum of the oxidation numbers = the charge on the ion.

Question 3

What is the oxidation rule for Group 1 elements?

Answer 3

All group 1 are +1

Question 4

What is the oxidation rule for Group 2 elements?

Answer 4

All group 2 are +2

Question 5

What is the oxidation rule for Oxygen?

Answer 5

Oxygen = -2 (except in H2O2 when it is -1 or with Fluorine with it is +2)

Question 6

What is the oxidation rule for Hydrogen elements?

Answer 6

Hydrogen is +1 (except in metal hydrides its H-)

Question 7

What is the oxidation rule for Chlorine elements?

Answer 7

Chlorine is -1 (except with oxygen or fluorine when its +1)

Question 8

What is the oxidation rule for fluorine?

Answer 8

-1

Question 9

Define a Oxyanion?

Answer 9

Negative ions that contain oxygen

Question 10

What is oxidation?

Answer 10

The loss of electrons

Question 11

What is reduction?

Answer 11

The gain of electrons

Question 12

What always occurs in REDOX reactions?

Answer 12

Both oxidation and reduction

Question 13

What is a half equation?

Answer 13

An equation that shows which elements have gained or lost electrons in a redox reaction.

Question 14

What is disproportionation?

Answer 14

When a single element is simultaneously oxidised and reduced in the same reaction.

Question 15

What are some everyday uses of REDOX reactions?

Answer 15

.Batteries
.Photosynthesis
.Corrosion
.Fuel combustion