Explain the law of chemical combination

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1. Law of Conservation of Mass:
In simple terms, this law states that matter can neither be created nor destroyed. In other words, the total mass, that is, the sum of mass of reacting mixture and the products formed remains constant. Antoine Lavoisier gave this law in the year 1789 based on the data he obtained after carefully studying numerous combustion reactions.

2. Law of Definite Proportions:
Joseph Proust, a French chemist stated that the proportion of elements by weight in a given compound will always remain exactly the same. In simple terms we can say that, irrespective of its source, origin or its quantity, the percent composition of elements by weight in a given compound will always remain the same.

3. Law of Multiple Proportions:
This law states that if two elements combine to form more than one compound, the masses of these elements in the reaction are in the ratio of small whole numbers. This law was given by Dalton in the year 1803.

4. Gay Lussac?s Law of Gaseous Volumes:
In 1808, Gay Lussac gave this law based on his observations. This law states that when gases are produced or combine in a chemical reaction, they do so in simple ratio by volume given that all the gases are at same temperature and pressure. This law can be considered as another form of law of definite proportions. The only difference between these two laws of chemical combination is that Gay Lussac?s Law is stated with respect to volume while law of definite proportions is stated with respect to mass.

5. Avogadro?s Law:
Avogadro proposed this law in the year 1811. It stated that under same conditions of temperature and pressure, equal volume of all the gases contain equal number of molecules. This implies that 2 litres of hydrogen will have the same number of molecules as 2 litres of oxygen given that both the gases are at same temperature and pressure.

The laws of chemical combination discussed above form the base for quantitative study of chemical reactions.

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In chemical reactions, pure elements or combinations of elements called compounds get rearranged. In nuclear reactions, the nucleus of atoms change. In both cases, mass is conserved even though new substances are created. Imagine an empty room with one door and five people walk into the room. Eventually five people have to leave the room. What goes in has to come out. The?law of the conservation of mass?states that mass before reaction has to equal mass after reaction. So, let's go through a chemical and nuclear reaction to show how mass before a reaction equals mass after a reaction.
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