5
AssignmentMultiple Choice

Heat

Question 5 • *25-26 KCS18 Chemistry IC

Which chemical or physical change is an endothermic process?

Answer
A
the burning of a candle
B
the condensing of gaseous water on a glass filled with a cold liquid
C
the melting of an ice cube
D
the rusting of an old car

Explanation

An endothermic change absorbs heat from its surroundings. Melting ice requires heat to break the solid water structure, so the ice cube takes in energy as it melts. Burning and rusting release energy overall, while condensation releases heat as water vapor becomes liquid.

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