Question

Which describes a process where a precipitate is formed?

A.
A solution of AgNO3 is added to a solution of CaCl2 to produce solid AgCl and a solution of CaNO3.

B.
Propane gas combusts to form CO2 and H2O.

C.
A solution of HCl mixes with a solution of Ca(OH)2 to produce H2O and CaCl2.

D.
A solution of H2SO4 mixes with a solution of NaOH to produce water and Na2SO4.

Answer 1

A. because a solid or precipitate is forming. The rest are just solution.