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chemistry

Addition of oxygen

Oxidation in terms of movement of oxygen

Removal of oxygen

Reduction in terms of movement of oxygen

Addition of hydrogen

Reduction in terms of movement of hydrogen

Loss of electrons

Oxidation in terms of electron transfer

Gain of electrons

Reduction in terms of electron transfer

Oxidising agent

A that brings about oxidation in other substances

Reduced

What happens to the oxidising agent

Reducing agent

A substance that brings about reduction in other substances

Oxidised

What happens to the reducing agent

Halogens

Group of elements which are good oxidising agents - they oxidise chemicals in the cells of germs which kills them

Hydrogen peroxide

Oxidising agent used to bleach hair

Carbon monoxide

Reducing agent (gas) used to remove the oxygen from iron ore in order to convert it to pure iron

Oxidation number

The charge that an atom has or appears to have when electrons are distributed according to certain rules

0

The oxidation number of any uncombined element

(Adds to) 0

The sum of the oxidation numbers of all the elements in a compound

Same as its charge

The oxidation number of an ion of an element

(Adds to) the charge

The sum of the oxidation numbers of all the elements in a complex ion

-2

Oxidation number of Oxygen normally

-1

Oxidation number of Oxygen peroxides

+2

Oxidation number of Oxygen in the compound OF2

+1

Oxidation number of Hydrogen normally

-1

Oxidation number of Hydrogen in the metal hydrides

-1

Oxidation number of Halogens normally

+1

Oxidation number of Halogens when bonded to a more electronegative atom

Increase

Oxidation in terms of oxidation number

Decrease

Reduction in terms of oxidation number

Displace (takes electrons from)

What a halogen does to solutions of salts of less electronegative halogens

Oxidises sulfite to sulfate

What chlorine does to a sodium sulfite solution

Oxidises Fe2+ to Fe3+

What chlorine does to an iron(II) sulfate solution

Displaces Cu2+ ions as copper metal

What happens when a piece of zinc metal or magnesium metal is dipped into copper sulfate solution

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