Question

Q13. What are the different observations that help us to indicate that a
chemical reaction has completed? Write example in each​

Answer 1

 $\huge\boxed{\underline{\mathcal{\red{A}\green{N}\pink{S}\orange{W}\blue{E}\pink{R}}}}$

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

Answer 2

Answer:

signs of chemical reaction

Explanation:

there are several indications that a chemical reaction has taken place. These includes a spontaneous color change, precipitation of a solid, a change in temperature, change in pH, or bubbling ( gas evolving)