Select all of the true statements about melting points. a. The melting point range of a pure substance is the same as the range for an impure sample of the substance b. A pure substance has a narrow range of melting temperatures c. All solids have melting points below room temperature. d. The melting point of a substance is determined by heating the substance in a beaker using a Bunsen burner. e. The melting point of a pure substance is an exact temperature measured to 3 or more decimal places. Explain each

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