3. a) State the law of chemical combination and explain it.

1.	3. a) State the law of chemical combination and explain it.
Answer» Law of Conservation of MassIt states thatmatter can neither be created nor destroyed.Law of Definite ProportionsIt stated thata given compound always contains exactly the same proportion of elements by weight.Example : Oxygen and hydrogen in water always bear ratio of 16:2 or 8:1 by massLaw of Multiple ProportionsAccording to this law,if two elements can combine to form more than one compound, the masses of one element that combine with a fixed mass of the other element, are in the ratio of small whole numbers.ExampleHydrogen + Oxygen → Water2g 16g 18gHydrogen + Oxygen → Hydrogen Peroxide2g 32g 34gHere, the masses of oxygen (i.e. 16 g and 32 g) which combine with a fixed mass of hydrogen (2g) bear a simple ratio, i.e. 16:32 or 1: 2.

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