What is the difference between a pure substance and a mixture ?

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Answer

A pure substance consists of only one kind of matter, that is, all the particles are same. It has a definite composition and constant properties. It cannot be split into simpler substances by physical means. All pure substances have characteristic melting and boiling points. A pure substance is either a compound or an element.
A Mixture contains two or more substances in any proportion which can be separated by physical methods. Mixtures are generally of two types : Homogeneous and Heterogeneous.
In a mixture, the constituents can be present in any ratio. They do not have characteristic melting and boiling points. In a mixture each constituent retain its original properties. These can be separated by physical means.

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Column A	Column B
1. a change which cannot be easily reversed	a. man-made change
2 a change that repeats itself at regular intervals	b. chemical chang
3. a change that is made by humans	c. physical change
4. a change in which the original substance cannot be obtained	d. periodic change
5. a change where no new substance is formed	e. irreversible change
	f . slow change