A. Mohammed's procedure was correct, but he tested a type of water that boils more quickly than isopropyl alcohol.

B. The heating vessel or hot plate was not at the same temperature
each time.

C. The boiling vessel might have been dirty, so the solutions got
mixed.

D. Mohammed could have mixed up the labels on the containers.

Suppose that some of the compound spilled out of the crucible after it was heated. would that cause the percent by mass of water in the compound determined by the experiment to be too low, too high, or unchanged? briefly explain your answer.

What prefix multiplier is appropriate for reporting a measurement of 5.57 ×10−5 m?

You are attempting to recrystallize a crude product mixture. you add the appropriate amount of hot solvent and are allowing the solution to slowly cool to room temperature. however, at room temperature no crystals have appeared, which of the following methods should be used to induce crystallization? choose all correct answers. a) place the flask in an ice bath. b) swirl the contents of the flask. c) add a small seed crystal of the desired product. d) scratch the inside of the glassware using a stir rod. it can be multiple choices