The formation of a solid, also known as a precipitation reaction, is an indication of a chemical change.
Precipitation reaction talks about when a solid substance formed in the water, or the reaction upon mixing two aqueous (water-like or containing water) solutions.
Answer: precipitate
Explanation: Chemical change is a change in which the chemical composition of the atoms changes. The following changes are seen when chemical reaction takes place:
1) Release or absorption of heat
2) Formation of solid or a precipitate
[tex]2AgNO_3(aq)+BaCl_2(aq)\rightarrow 2AgCl(s)+Ba(NO_3)_2(aq)[/tex]
3) Change in color
4) Production of gas
