Question

A student is given two clear solutions. One solution contained lead ions, Pb2+ and the other solution contains chloride ions, Cl-. When the two solutions are mixed, a clear solution with white powder at the bottom results. What has happen to cause this change?
A) A chemical change has occurred creating a precipitate.
B) A physical change has occurred creating a precipitate.
C) A chemical change has occurred creating a dissociation.
D) A physical change has occurred creating a dissociation.

Answer 1

The answer is A.) A chemical change has occurred creating a precipitate. 

Chemical changes occur when a substance combines with another to form a new substance, or two or more different substances. Precipitate causes (a substance) to be deposited in solid form from a solution.