Question

how do we come to know that the chemical reaction has taken place​

Answer 1

Answer:

We can tell if a chemical reaction has taken place when one or more of the following things happen:

• There has been a colour change inside the reaction flask.
• A gas has formed. Usually we know a gas has formed when we can see bubbles. ...
• A solid has formed.

Explanation:

HOPE IT WILL HELP YOU

Answer 2

Answer: Here is your answer :)

Explanation:

We get to know when chemical reaction takes place as the components , colour , and overall look changes .

sometimes , the reaction might be subtle so we should carefully observe the reaction