June 2023 Regents Chemistry Exam
16 The melting of an ice cube is an example of an
(1) endothermic, chemical change
(2) endothermic, physical change
(3) exothermic, chemical change
(4) exothermic, physical change
Solution: Chemical changes change the identity of the substance and physical changes do not. Phases changes such as melting are physical changes, eliminating choices 1 and 3. Heat is required to melt ice (go from solid to liquid). Endothermic is a process where heat is absorbed.
Answer: 2
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