define chemical changes
and give it features
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chemical Changes occur when a substance combined with another to form a new substance.
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THE ORIGINAL SUBSTANCE LOSE THEIR IDENTITY AS WELL AS NATURE AND FORM DIFFERENT CHEMICAL SUBSTANCES
THESE ARE KNOWN AS CHEMICAL CHANGES
THE FEATURES ARE :-
1)-there generally a change in colour of the reacting species taking part in the change
2)-the physical state if the substance normally changes
3)-in some cases, a gas may be evolve
4)-in some cases, a precipitate may be formed
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