Question

How matter is conserved during chemical reaction?

Answer 1

Hint: As we know that the chemical reactions generally involve the rearranging of various atoms to result in the formation of new substances and we are also aware of the laws of chemical combinations which are obeyed when a chemical reaction takes place.

Complete step-by-step answer:
As we know that chemical reactions conserve mass because according to the law of conservation of mass during any physical or chemical change, the same number of atoms of a particular element must exist on the reactant and products sides. In other words, we can say that the mass is conserved in a chemical reaction where reactants are neither created nor destroyed but they are simply converted to their particular products.

We can show this with the help of an example where mercuric oxide is heated to produce free mercury and oxygen as shown below:
$2HgO\xrightarrow{\Delta }2Hg + {O_2}$

Where, we can assume that the mass of mercuric oxide is $100g$ and $92.6g$ free mercury and $7.4g$ oxygen is produced on heating. So the sum of the masses of the product formed is equivalent to the mass of the reactant. Hence we can say that the mass is conserved.

So in conclusion we can say that matter is conserved in a chemical reaction when there is neither creation of any matter nor the matter is destroyed. It may be assumed that during heating or burning can destroy the matter but we see that the same amount or same mass exist when a wood is burnt.

Note: Always remember that in conservation of matter in any chemical or physical reaction, the number and kind of atoms should be the same after the chemical reaction as they were present before the chemical reaction.