Usually a story-based problem (e.g., a kitchen accident or a laboratory observation).
These integration situations typically test a student's ability to distinguish between physical and chemical changes through real-world scenarios: Usually a story-based problem (e
List the initial substances and the final products. Usually a story-based problem (e.g.
Changes that result in new substances with different properties (e.g., combustion of paper, iron rusting, fermentation). combustion of paper
A core rule taught in these papers—the total mass remains constant before and after a transformation.