Designed by Koen, my 4 yr old son for daddy.

Designed by Koen, my 4 yr old son for daddy.

Monday, August 3, 2009

Types of Oxide

First of all, what do we consider to be oxides? Generally when a substance is made up of an element and oxygen only, its considered to be an oxide.

The compound CaO, is considered an oxide since it is made up of calcium element and oxygen only. While NaOH, sodium hydroxide is not an oxide as it contains 3 elements. Hence in order to be an oxide it has to follow the sequence below.

Element A + Oxygen -----> A Oxide.

There are 2 major categories of oxide, namely metallic and non metallic oxide.

Metallic Oxide
Basic Oxide
a)The first type of metallic oxide is known as basic oxide. This group of oxide reacts with acid in a neutralization reaction and if it dissolves in water, it will form alkali (the soluble basic oxides are all the group 1 oxides and calcium hydroxide based on O levels syllabus).

Amphoteric Oxides
b)The second type of metal oxide is made up of zinc oxide, aluminium oxide and lead (II) oxide.
This group of oxides react with both acid and alkalis.

Non Metallic oxides
c)Acidic oxides
Acidic oxides are non metal oxides that produces hydrogen ions when dissolved in water. Otherwise, any non-metal oxides can be classified as acidic oxides. However there are a few exceptions and these are the neutral oxides

d) Neutral oxides
This last group of oxide are made up of all monoxides (carbon monoxide or nitrogen monoxide etc) and water. They do not have an effect on any indicators. Cheers.


Entry by
Json Lim

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