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Which of the following is a physical change?
Rusting of iron
Melting of ice
Burning of wood
Digestion of food
Melting of ice
A physical change involves a change in the physical state, shape, or size of a substance without altering its chemical composition or creating new substances. Melting of ice is a reversible physical change where H2O transitions from solid to liquid phase without changing its molecular formula.
A physical change involves a change in the physical state, shape, or size of a substance without altering its chemical composition or creating new substances. Melting of ice is a reversible physical change where H2O transitions from solid to liquid phase without changing its molecular formula.
The law of conservation of mass, formulated by Antoine Lavoisier, applies to all chemical reactions, whereas physical changes typically involve changes in intermolecular forces rather than atomic bonds.
Physical changes are generally reversible, whereas chemical changes are usually irreversible.
No new chemical substance is formed during a physical change.
Chemical changes result in the formation of one or more new substances with different chemical properties.
Rusting of iron (Option A) is a chemical change involving the oxidation of iron in the presence of oxygen and moisture to form hydrated iron(III) oxide.
Burning of wood (Option C) is a chemical change (combustion) that releases heat, light, and produces ash, carbon dioxide, and water vapor.
Digestion of food (Option D) is a complex chemical change involving enzymatic breakdown of large food molecules into simpler substances.
Phase transitions such as freezing, melting, condensation, and sublimation are classic examples of physical changes.
B is correct тАФ Melting of ice is a reversible state change where the chemical identity remains H2O.
In Chemistry exams, always look for indicators of chemical change such as gas evolution, temperature change, or permanent color change, which differentiate them from simple phase shifts.
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