when looking at a chemical equation what are the evidences that a chemical reaction has occured. Or what is the evidence that it has not occured

Question

thanks:):) <3

Answer 1

I look for the following to determine if a reaction will occur:
a. a precipitate (insoluble material) is formed.
b. a gas is formed.
c. a slightly ionized material is formed (for example, H2O or acetic acid).