January 2019 NY Regents Chemistry Exam
39 A mixture consists of ethanol and water. Some properties of ethanol and water are given in the table below.
Which statement describes a property of ethanol after being separated from the mixture?
(1) Ethanol is nonflammable.
(2) Ethanol has a melting point of 0.°C.
(3) Ethanol has a density of 0.80 g/cm3 at STP.
(4) Ethanol has a boiling point of 89°C at standard pressure.
Solution: Let's look at the chart to eliminate some of the answer choices. According to the chart ethanol is flammable, eliminating choice 1. It has a melting point of -114C eliminating choice 2. It has a boiling point of 78C eliminating choice 4. It has a a density of 0.80 g/cm3 according to the chart.
Answer: 3
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