Chemistry 2000+ Qualification Phase is the continuation of Chemistry 2000+ Introductory Phase. Due to the consistent implementation of the new core curriculum for North Rhine-Westphalia, this newly presented volume differs from the already established Chemistry 2000+ upper school volumes through a more detailed representation of the currently prescribed content, which is summarized in newly structured content areas and thus modified chapters. The prescribed basic concepts serve as criteria for the elementalization of subject content and their connection to larger units and related STEM subjects. The double-page principle, the experiment-based approach, and the context- and competence-oriented exploration of the subject content have been optimized. Similar to Chemistry 2000+ Introductory Phase, this volume for the Qualification Phase includes dedicated pages for competence acquisition.