Question

What is meant by 'reversible changes ' and ' irreversible changes'explain with an example

Answer 1

A reversible reaction is a reaction where the reactants form products, which react together to give the reactants back. 

In many chemical reactions, the reactants form products and that is the end of the story. The products cannot re-form the reactants. ... These are called reversible reactions. An example of a reversible reaction involves ammonia gas (NH3), hydrogen chloride gas (HCl), and ammonium chloride solid (NH4Cl).


In a irreversible reaction, the reactants react to form the products, which cannot revert back into reactants.


This example demonstrates the irreversible reaction capabilities of PHREEQC in modeling the oxidation of pyrite. Oxygen (O 2 ) and NaCl are added irreversibly to pure water in six amounts (0.0, 0.001, 0.005, 0.01, 0.03, and 0.05 mol); the relative proportion of O 2 to NaCl in the irreversible reaction is 1.0 to 0.5.

Answer 2

Answer:

reversible changes are the changes which can be  reversed  and we can get the original thing/object back whereas irreversible changes are the changes which cannot be reverse and we cannot get the original item back , it is either destroyed or transformed into another substance

Explanation:

if we fold a paper  and then unfold it , we can say  that it is a reversible change ,i.e., it could be reversed and we got the original thing back.

on the other hand, if we burn a paper , we can say that it is a irreversible change,i.e., the original paper is destroyed and it is formed into a new item that i sashes of the paper.