define law of chemical combinations
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LAWS OF CHEMICAL COMBINATIONS: Law of Conservation of Mass. It states that matter can neither be created nor destroyed. Law of Definite Proportions. It stated that a given compound always contains exactly the same proportion of elements by weight.
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Law of Conservation of Mass. The lawof conservation of mass states that the net change in mass of the reactants and products before and after a chemical reaction is zero. This means mass can neither be created nor destroyed. In other words, the total mass in a chemical reaction remains constant.
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