Question

How do you determine chemical reaction had took place 0?

Answer 1

Answer:

New substances formed, as evidenced by the color changes and bubbles. Some signs of a chemical change are a change in color and the formation of bubbles. The five conditions of chemical change: color chage, formation of a precipitate, formation of a gas, odor change, temperature change.

Answer 2

evolution of gas ,change in temperature, change in color ,change in physical state