What are indications that a chemical reaction has occurred?

1 Answer
May 23, 2016

Answer:

See below.

Explanation:

The indications of a chemical change or a chemical reaction has occurred are the following:

  1. Formation of a precipitation.
  2. Change in color.
  3. Evolution of gas.
  4. Evolution or absorption of heat.
  5. Odor.

Here is a video that features experimental procedures on physical and chemical change:
Lab Experiment #2: Physical & Chemical Changes.