3 - Redox 1 Flashcards Preview

Edexcel A Level Chemistry > 3 - Redox 1 > Flashcards

Flashcards in 3 - Redox 1 Deck (19)
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1
Q

What is oxidation?

A

Loss of electrons and hydrogens. Gain of oxygens

2
Q

What is reduction?

A

Gain of electrons and hydrogens. Loss of oxygens

3
Q

What happens it oxidation?

A

The element looses electrons

4
Q

What happens in reduction?

A

The element gains electrons

5
Q

Example of an oxidising agent?

A

Halogens and Hydrogen peroxide

6
Q

Example of a reducing agent?

A

Reactive metals

7
Q

Balancing redox equations?

A
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
Q

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

A

Right

9
Q

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

A

left

10
Q

What are the roman numerals to indicate charge called?

A

stock notation

11
Q

What do you do if the electrons are unbalanced?

A

x the half equation

12
Q

OIL RIG

A

oxidation is loss, reduction is gain

13
Q

Oxidation number of oxygen

A
  • 2 usually

- 1 in peroxides

14
Q

Oxidation number of hyrogen

A

+1 usually

-1 when combined with metals

15
Q

Oxidation number of aluminium

A

+3 ALWAYS

16
Q

oxidation number of flourine

A

-1 ALWAYS

17
Q

What does the charge of a lone element indicate?

A

The oxidation number e.g Fe3+ = +3

18
Q

What does the charge of a molecule mean?

A

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

19
Q

What do you balance redox equations with?

A

H+ and H2O