Question

Name any two laws of chemical combination.

Answer 1

To solve this we must recall the concept of laws of chemical combination. The matter transfers from one form to another. The transformation is the result of a combination of two different types of matter.

Complete step by step answer:
We know that there are five laws of chemical combination as follows:
1- Law of conservation of mass.
2- Law of definite proportions.
3-Law of multiple proportions.
4-Gay Lussac’s law of gaseous volumes.
5-Avogadro’s law.

-We will explain the two laws: law of conservation of mass and law of definite proportions.
1-Law of conservation of mass:
The law of conservation of mass states that matter can neither be created nor be destroyed in a chemical reaction.
The law explains that in a chemical reaction, mass of reactants and the mass of products will always be equal. According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus, we always balance a chemical equation.
-For any chemical reaction, the mass of reactant consumed is equal to the mass of the product formed.
Example of the law of conservation of mass is the formation of water. The reaction is as follows:

${\text{2}}{{\text{H}}_{\text{2}}} + {{\text{O}}_{\text{2}}} \to {\text{2}}{{\text{H}}_{\text{2}}}{\text{O}}$

Here, the mass of reactants is equal to the mass of the product. Thus, the reaction proves the law of conservation of mass.

2-Law of definite proportions:
The law is also known as law of constant proportions. The law of definite proportions states that in a chemical substance, the elements are always present in definite proportions by mass.
-According to the law, the relative number and kinds of atoms are constant for every compound.
Example of the law of definite proportion is as follows:

In a water molecule $\left( {{{\text{H}}_{\text{2}}}{\text{O}}} \right)$, the ratio of mass of hydrogen and the mass of oxygen is ${\text{1:8}}$. The ratio is always constant.

Note: Other three laws are:
- The law of multiple proportions states that if the elements combine to form two or more compounds then; the mass of the elements in the compounds are in the ratio of small whole numbers.
-Gay Lussac’s law of gaseous volumes states that the ratio of volumes of reacting gases are small whole numbers at same temperature and pressure.
-Avogadro’s law states that equal volumes at the same temperature and pressure contain equal numbers of moles of gas.