January 2019 NY Regents Chemistry Exam
19 Given the equation: I2(s) → I2(g) Which phrase describes this change? (1) endothermic chemical change
(2) endothermic physical change
(3) exothermic chemical change
(4) exothermic physical change
Solution: (s) stands for solid and (g) stands for gas. Changing phases is a physical change. Going from solid to liquid to gas requires energy absorption and is an endothermic process.
Answer: 2
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