January 2018 NY Regents Chemistry Exam
49 The cooling curve below represents the uniform cooling of a substance, starting at a temperature above its boiling point.
During which time interval does the substance exist as both a liquid and a solid? (1) min2 to min4
(2) min4 to min5
(3) min5 to min7
(4) min7 to min9
Solution: The horizontal lines represent two phases together. In the cooling curve, we start with a gas (1-2min), then gas and liquid (2-6min), followed by liquid (6-7min), followed by liquid and solid (7-9mins) and finally only solid (9-11min).
Answer: 4
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