Question

how can we say that whether a chemical reaction has taken place or not​

Answer 1

Answer:

pls mark me as a brainlist

Explanation:

A chemical reaction is usually accompanied by easily observed physical effects, such as the emission of heat and light, the formation of a precipitate, the evolution of gas, or a color change.

Answer 2

$We can say a reaction a chemical change when there is a irreversible change or the change that can't be reversed$