What method of testing substances is the best way to identify a chemical reaction

The chemical reaction comprises chemical changes, that is, changes in the composition of the molecules, the formation of new compounds. As a consequence of the chemical reaction, new substances are produced, which cannot be reversed by any physical means.  

One of the best ways to identify a chemical reaction is observing the change in color, or changes in the color of the substance. This is one of the most general observable chemical reaction known, the basic example is the changing of litmus paper color when it comes in contact with the acid.  

honesty and integrity.

inspire others.

commitment and passion.

good communicator.

decision-making capabilities.

accountability.

delegation and empowerment.

creativity and innovation.

here are the traits of a good leader.i'm not going to give you the examples so you can copy right it.that's illegal but i hope that this you out.

i just calculated it all out, and not including weekends, and all the different days off. as of this school year (2018-2019) students are spending 2198 hours in school this year