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The experiment aims to clarify the meaning of purity in the chemical sense ; apply the method of recrystallization in the purification of a solid sample; recognize melting point as a physical property that can serve as an index of purity; determine the melting point of a substance using a simple apparatus; and compare the melting point of a pure versus impure sample of a substance.
Best Answer: 1. in most pure substances, melting occurs at a specific Temperature called the melting point. 2. the change of state from liquid to solid is called freezing (solidification) 3. the change from a liquid to gas is called Condensation.