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Changes in state or form where the nature of the substance remains the same (e.g., melting ice, dissolving salt in water).

Explain why a change is physical or chemical based on the "reversibility" or "appearance of new substances" criteria. Changes in state or form where the nature

List the initial substances and the final products. combustion of paper

You can find and download these educational papers on the Lazib.com Physical Sciences section or via reputable Algerian educational portals like Education-DZ or Encyclo-Education. Key Concepts in the "Matter and its Transformations" Paper: Changes in state or form where the nature

Changes that result in new substances with different properties (e.g., combustion of paper, iron rusting, fermentation).