August 2018 1 13 Report
Determinar si es una sustancia pura o mescla
-amoniaco, borax, marmol, yeso, ozono, metano, cal, laton, oxida de molibdeno, petroleo, manzana, papel, vidrio, madera, grafito, cuarzo, ferro molibdeno, concreto
por favor ayudaaaaa...!!!!

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