Looking for structured, AP-aligned practice to help students master percent composition, empirical formulas, and molecular formulas? This AP Chemistry Unit 1.3 resource provides scaffolded problem sets and AP-style free-response questions (FRQs) designed to help students apply the correct mathematical relationships, show their work clearly, and understand how points are earned on assessments. What’s Included✔ Scaffolded problem set focused on percent composition and formula determination