Question

The formation of a solid, also known as a _____, is an indication of a chemical change.

Answer 1

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

$2AgNO_3(aq)+BaCl_2(aq)\rightarrow 2AgCl(s)+Ba(NO_3)_2(aq)$

3) Change in color

4) Production of gas

Answer 2

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.