3 - Redox 1 Flashcards Preview

Edexcel A Level Chemistry > 3 - Redox 1 > Flashcards

Flashcards in 3 - Redox 1 Deck (19)
Loading flashcards...
1

What is oxidation?

Loss of electrons and hydrogens. Gain of oxygens

2

What is reduction?

Gain of electrons and hydrogens. Loss of oxygens

3

What happens it oxidation?

The element looses electrons

4

What happens in reduction?

The element gains electrons

5

Example of an oxidising agent?

Halogens and Hydrogen peroxide

6

Example of a reducing agent?

Reactive metals

7

Balancing redox equations?

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

8

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

Right

9

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

left

10

What are the roman numerals to indicate charge called?

stock notation

11

What do you do if the electrons are unbalanced?

x the half equation

12

OIL RIG

oxidation is loss, reduction is gain

13

Oxidation number of oxygen

-2 usually
-1 in peroxides

14

Oxidation number of hyrogen

+1 usually
-1 when combined with metals

15

Oxidation number of aluminium

+3 ALWAYS

16

oxidation number of flourine

-1 ALWAYS

17

What does the charge of a lone element indicate?

The oxidation number e.g Fe3+ = +3

18

What does the charge of a molecule mean?

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

19

What do you balance redox equations with?

H+ and H2O