Remove and cool the wire. Scrape a section of the wire that was in the flame, and compare the interior appearance with that of the outer surface. Remove the test tube from the boiling water and observe closely as it cools. Use the above behavior of Cu and I 2 to comment on the reversibility of chemical vs. physical changes. Use this result, along with the NaCl solubility determined earlier to decide which product is the solid and which remains in solution.
Filtration is a method used to separate a liquid from a solid.
Filter the mixture according to directions given by your instructor. The tarnishing of silverware. Carefully define and distinguish between melting and burning. Give a reason for your answer. Describe in detail the procedures, measurements, and calculations you would perform.