Friday, 18 January 2013

Compounds

Compounds are formed when elements are chemically combined together.

Example: When the element magnesium burns in the element oxygen, a brilliant white flame is seen and a new substance, magnesium oxide, is called a compound. The compound has very different properties from the elements that form it.

Compound                                   Elements present
common salt (sodium chloride)    sodium, chlorine
carbon dioxide                             carbon, oxygen
marble (calcium carbonate)          calcium, carbon, oxygen
copper(||) sulphate                        copper, sulphur, oxygen
hydrogen chloride                        chlorine, hydrogen



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