There was nothing for the metal to react with, so only a physical change could have occurred.
The sample was only heated, so neither a physical nor a chemical change occurred.
A student mixes
crystals with distilled water in a beaker. After the mixture was
stirred, no crystals are visible and the solution is clear. After several days, all of the water
evaporates and white crystals are found in the beaker. Which of following pieces of experimental
evidence would best help the student to confirm that a new compound had not been made and that
only a physical change occurred?