3 - Redox 1

Question 1

What is oxidation?

Answer 1

Loss of electrons and hydrogens. Gain of oxygens

Question 2

What is reduction?

Answer 2

Gain of electrons and hydrogens. Loss of oxygens

Question 3

What happens it oxidation?

Answer 3

The element looses electrons

Question 4

What happens in reduction?

Answer 4

The element gains electrons

Question 5

Example of an oxidising agent?

Answer 5

Halogens and Hydrogen peroxide

Question 6

Example of a reducing agent?

Answer 6

Reactive metals

Question 7

Balancing redox equations?

Answer 7

Work out what's oxidised and reduced.
Assign oxidation numbers
Write 2 1/2 equations to show whats lost/ gained
Balance with H+ and H2O
Make sure electron charge is the same
Add together

Question 8

Which side of the equation do the lost electrons go on?

Answer 8

Right

Question 9

Which side of the equation do the gained electrons go on?

Answer 9

left

Question 10

What are the roman numerals to indicate charge called?

Answer 10

stock notation

Question 11

What do you do if the electrons are unbalanced?

Answer 11

x the half equation

Question 12

OIL RIG

Answer 12

oxidation is loss, reduction is gain

Question 13

Oxidation number of oxygen

Answer 13

• 2 usually

- 1 in peroxides

Question 14

Oxidation number of hyrogen

Answer 14

+1 usually

-1 when combined with metals

Question 15

Oxidation number of aluminium

Answer 15

+3 ALWAYS

Question 16

oxidation number of flourine

Answer 16

-1 ALWAYS

Question 17

What does the charge of a lone element indicate?

Answer 17

The oxidation number e.g Fe3+ = +3

Question 18

What does the charge of a molecule mean?

Answer 18

That the sum of the oxidation numbers how to equal the charge

Question 19

What do you balance redox equations with?

Answer 19

H+ and H2O