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List the initial substances and the final products.

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:

Explain why a change is physical or chemical based on the "reversibility" or "appearance of new substances" criteria. List the initial substances and the final products

These integration situations typically test a student's ability to distinguish between physical and chemical changes through real-world scenarios:

A core rule taught in these papers—the total mass remains constant before and after a transformation. Using tests like the limewater test to detect

Usually a story-based problem (e.g., a kitchen accident or a laboratory observation).

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

Using tests like the limewater test to detect CO2cap C cap O sub 2 or using a flame to identify oxygen or hydrogen. How to Use the Paper: