A physical change involves alterations in state without changing chemical composition - as observed in processes like water evaporation. Particle size changes, like in calcium carbonate, retain the original properties without forming new substances.
Physical change: A physical change is one where the particles of the substances that are involved in the change are not broken up in any way. For example, when water is heated and evaporates to form water vapor, it is a physical change. The molecular structure of the water remains the same. It is an alteration in state without changing the chemical composition.
Particle size change: In the case of calcium carbonate undergoing a particle size change, it still retains its original properties and does not transform into a new substance. This is a physical change because while there is a change in particle size, the chemical identity remains the same. Calcium carbonate remains calcium carbonate despite the change in particle size.
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