Multiple choice

Which of the following changes does not represent a chemical change?

  1. Cooking of food

  2. Melting of ice

  3. Butter turning rancid

  4. Burning of wood
Reveal answer Fill a bubble to check yourself
B Correct answer
Explanation

Melting ice is a physical change: only the state changes from solid to liquid while H₂O molecules remain unchanged (reversible). Cooking, butter turning rancid (oxidation), and burning all involve chemical reactions creating new substances with different properties (irreversible).

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