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2º revo. de química

2da revolución de la química

Ley de las proporciones definidas Los elementos de un mismo compuesto están presentes en una proporción fija en masa, independientemente de cómo se prepare el compuesto.
¿Quién propuso la ley de las proporciones definidas? Químico francés Joseph Louis Proust
Ley de las proporciones múltiples Determinados elementos pueden combinarse en distintas proporciones de masa para formar compuestos diferentes.
En el siglo XIX varios científicos contribuyeron a organizar la diversidad de elementos conocidos hasta entonces Stanislao Canizzaro y Dimitri Mendeleiev
¿Quién resolvió las inconsistencias que mostraban los valores de masa atómica expuestos por John Dalton? Canizzaro (1858)
¿Qué fue lo que consideró Canizzaro? Algunos elementos no se encontraban en la Naturaleza como átomos aislados, sino formando moléculas
¿Por qué se inventó la uma? La masa de los átomos era muy pequeña y la de los gramos muy grande, así que se inventó la uma.
¿Qué significa unidad de masa atómica? Unidad de masa atómica
¿En qué siglos se inventó la uma? Siglo XIX
Created by: valeriarg



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