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Given the equation:I2(s) → I2(g)Which phrase describes this change?

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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