Which method of testing substances is a sure way to identify a chemical reaction?
a. change in color
b. formation of bubbles
c. change in density
d. increase in temperature
e. solubility in water

Chemical reaction includes chemical changes (modifications in the structures of molecules, new compounds )of the substances in the reaction. As a result of the chemical reaction new substances are formed that cannot be reversed using physical means.

The following method of testing substances is a sure way to identify a chemical reaction:

A. color change

B. Formation of bubbles

D. increase in temperature  

the inner core.

good luck: )

klicker