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Explain why a change is physical or chemical based on the "reversibility" or "appearance of new substances" criteria.

Changes that result in new substances with different properties (e.g., combustion of paper, iron rusting, fermentation). Explain why a change is physical or chemical

A core rule taught in these papers—the total mass remains constant before and after a transformation. combustion of paper

List the initial substances and the final products. Explain why a change is physical or chemical