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Par exemple
La chimie étudie également les transformations de la matière qui font intervenir des modifications sur les couches électroniques externes : réactions chimiques oxydo-réduction, acido-basique.
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Are you know about Chemistry
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Branch of science which deals with structure, composition, properties and changes in energy with laws or principles which govern these changes is called chemistry. the word chemistry is taken from ALKIMIYA which was changes to Alchemy .

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