Question

How do we come to know that a chemical reaction has takes place?​

Answer 1

Explanation:

Anyone who has encountered WTF in the wild probably knows that its primary meaning is “what the luck,” but the W can also stand for various other question words

Answer 2

Answer:

$\huge{\tt{\red{}\green{A}\purple{N}\pink{S}\blue{W}\orange{E}\red{R}}}࿐࿐$

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.