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astuce?

yrr

By yrr
in UE1 - Chimie

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yrr AvaTATar

yrr

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salut,

 

est ce que quelqu un aurait une astuces pour savoir si au cours d une reaction le nombre d'oxydation augmente sans passer par le calcul?

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NIcotine tic tat

NIcotine

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Salut, désolé mais je ne vois pas d'autre méthode que le calcule pour trouver le no du MnO4- par exemple. 

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