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

List the initial substances and the final products. Usually a story-based problem (e

A core rule taught in these papers—the total mass remains constant before and after a transformation. Usually a story-based problem (e.g.

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: Usually a story-based problem (e

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

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