Chapter 2, Problem 2.4TC

Specific gravity is a physical property. Beakers hold three clear, colorless liquids A, B, and C. The values of the specific gravities of the liquids are measured and then listed in the “Before freezing” column. The beakers are placed in a freezer until a solid crust forms across the surface of each. The beakers are placed in a freezer until a solid crust forms across the surface of each. The crusts are removed, and the liquids are warmed to room temperature. Their specific gravities are measured again, and then their values are listed in the “After Freezing” column. Which beaker(s) contain(s) a pure substance, and which contain a mixture? Explain your reasoning