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.
The answer is A.) <span>A chemical change has occurred creating a precipitate.
</span>Chemical changes occur when a substance combines with another to form a new substance, or two or more different substances. Precipitate <span>causes (a substance) to be deposited in solid form from a solution. </span>
The answer is C. build up of electrical charges by friction
Static electricity is a stationary electric charge, typically produced by friction, which causes sparks or crackling or the attraction of dust or hair.
