Astudent 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.

Fugu, also known as puffer fish, is a sushi delicacy that can also be lethal. puffer fish contain a powerful toxin that can kill an adult a few hours after ingestion. sushi chefs who prepare fugu must be specially trained because any contamination of the toxin-free areas of the fish can be deadly. recently this toxin has been put to good use, as scientists have discovered that a purified form of it can treat severe pain in cancer patients. this recent scientific discovery would fall under which area of chemistry? applied biochemistry pure organic chemistry pure physical chemistry applied inorganic chemistry

How many miles of water are produced if 5.43 mol pbo2 are consumed

2pos suppose an object in free fall is dropped from a building. its starting velocity is 0 m/s. ignoring the effects of air resistance, what is the speed (in m/s) of the object after falling 3 seconds? give your answer as a positive decimal without units. answer here