What type of property can be observed only by changing a substance into a different substance

When you perform this reaction, what could remain at the end of the reaction? check all that apply. excess reactant aqueous copper chloride excess reactant aluminum oxygen product solid copper carbon dioxide product aqueous aluminum chloride water

0.2348 grams of pbcl2 used to form 44.0 ml of solution.

Which of these expressions are correct variations of the combined gas law? p1v1t2 = p2v2t1 both