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Which process represents a chemical change?(1) Iodine sublimes.


NY Chemistry Regents Exam Jan 2023


Which process represents a chemical change? (1) Iodine sublimes. (2) Water evaporates.

(3) An ice cube melts.

(4) A candle burns in air.


Solution: A chemical change is a change where an identity of the substance changes (a reaction will happen). Phase changes are not reactions and are therefore physical changes. A candle burning represents a reaction and is therefore a chemical change.


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