Redox and Oxidation Numbers Flashcards Preview

WJEC AS Chemistry > Redox and Oxidation Numbers > Flashcards

Flashcards in Redox and Oxidation Numbers Deck (12)
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1
Q

What happens when an element is oxidised

A

It loses electrons

2
Q

What happens when an element is reduced

A

It gains electrons

3
Q

What oxidation number do all uncombined elements have

A

0

4
Q

What is the oxidation number of ions

A

Oxidation state is the same as the charge

5
Q

What oxidation number do all neutral compounds have

A

0

6
Q

What is the oxidation number of complex ions

A

Overall oxidation number is equal to their charge

7
Q

What elements have a reliable oxidation number of 1

A

Hydrogen, group one metals and silver

8
Q

What elements have a reliable oxidation number of 2

A

Group 2 metals and zinc

9
Q

What element has a reliable oxidation number of -1

A

Fluorine (other halogens usually -1 also but can vary)

10
Q

What is the oxidation number of oxygen most of the time

A

-2

11
Q

What is a redox reaction

A

Where elements or compounds are both reduced and oxidised in the same reaction

12
Q

What is it called when the same element is both oxidised and reduced in the same reaction

A

Disproportionation