Which of the following everyday activities is a chemical change?
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A.
Dissolving sugar in water
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B.
Breaking a pencil
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C.
Cooking an egg
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D.
Cutting an apple
Correct Answer:
C. Cooking an egg
Explanation:
A chemical change occurs when a substance's molecular structure is altered, resulting in the formation of one or more new substances with different properties. In the case of cooking an egg, the application of heat causes the proteins to denature and undergo a permanent chemical transformation, changing the egg's texture and composition. In contrast, dissolving sugar, breaking a pencil, and cutting an apple are physical changes because the fundamental identity of the material remains the same. Since cooking involves a chemical reaction that cannot be easily reversed, it is classified as a chemical change.
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