To go with the ore-processing and fire-assay materials in the chemistry section, we include two lesson plans. The lesson on ore processing suggests the students first examine ore minerals and their related metal products, then explore a model ore-processing activity. Last, the lesson suggests that students read the ore-processing material and discuss it to review and extend their understandings. The lesson on fire assaying follows the same scheme, suggesting a model activity, then reading the material and discussing to review and extend the students' understanding.