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What Is a Chemical Change and Examples

Chemistry

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Definition of chemical change

A change in which one or more new substances are formed is called a chemical change. A chemical change is also called a chemical reaction. 
Examples are burning of any substance, rusting of iron.

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Burning magnesium in air.

Clean the tip of strip of magnesium with sandpaper. Bring the tip near a candle flame.It burns with a brilliant white, light. When it is completely burnt, it leaves behind a powdery ash.
Chemical reaction will be:

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Conditions for chemical change

The criteria for chemical change is the production of one or more new substances.
Conditions are: Minimum amount of energy to initiate reaction, collision between molecules for reaction to occur.

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