Class 9th
Science
Write the both laws of chemical combination.
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Answer:
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Laws Of Chemical Combination For Elements And Compounds:
(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 the mass of the 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.
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(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.
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(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.
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(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 a simple ratio by volume given that all the gases are at the same temperature and pressure. This law can be considered as another form of the 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 the law of definite proportions is stated with respect to mass.
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(5) Avogadro’s Law :
Avogadro proposed this law in the year 1811. It stated that under the same conditions of temperature and pressure, an equal volume of all the gases contains an equal number of molecules. This implies that 2 liters of hydrogen will have the same number of molecules as 2 liters of oxygen given that both the gases are at the same temperature and pressure.
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Answer:
there are five types of chemical combination that govern the chemical combination of element
1) laws of conservation of mass.
2)laws of multiple proportion.
3)laws of definete proportion.
4)law of gaseous volumes.
5) avogadro law