This 60-minute IB DP Chemistry lesson focuses on Structural Analysis II: The Unknown-Molecule Challenge. Students solve progressively less-supported unknown-molecule cases and justify a structure while rejecting an alternative.

Subtopic S3.2, lesson 20 of 20 in the teaching sequence. Syllabus coverage: S3.2.12 (second boundary).

The teacher walkthrough provides a lesson sequence, prompts and teaching guidance. The student activity document includes activity sheets, an exit ticket and a teacher answer key; keep the answer pages for teacher use.

Included: two editable Word (DOCX) documents in one ZIP. The teaching ZIP contains no PDFs.

Single-teacher classroom licence; no sharing with other teachers, public uploading, redistribution or resale. Independently authored by The Science Shop; customer-file integrity and packaging audited.