The problem is contextualized,flexible,and multi-faceted,and plays an important role in promoting higher-order thinking and improving students'problem-solving abilities.Therefore,in this paper,we develop a fixed project-based learning about nitrogen based on the characteristics of poorly constructed problems.In the process of completing the project tasks and presenting the project results,we help students understand the composition and changes of substances around them,develop the concept of particles,change and balance,and enhance the core literacy of the subject.
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