Chemistry Redox

Oxidation Number

100

The sum of oxidation numbers in a compound.

Zero

200

The oxidation state of a group 1 element

+1

300

The oxidation state of Br in Br₂

0

400

The oxidation state of H in CaH₂

-1

500

The oxidation state of sulfur in Na₂S₂O₃

+2

Oxidation Number II

100

The oxidation number of Ca.

Zero

200

The oxidation number of oxygen in H₂O₂

-1

300

Oxygen will have a positive oxidation state when combined with this element.

Fluorine

400

The oxidation number of nitrogen in NaNO₂

+3

500

The oxidation state of carbon in NaHCO₃

+4

Redox Reactions

100

Defined as the loss of electrons.

Oxidation

200

Defined as the gain of electrons.

Reduction

300

The substance that is oxidized in a redox reaction is known as this Agent.

Reducing Agent

400

The change in oxidation number from 0 to -2 represents this type of redox change. 

Reduction

500

Fe + 2AgCl → 2Ag + FeCl₂

In the redox reaction above which species is oxidized.

Fe