Chemical Equilibria Exam Questions

A full walkthrough of chemical equilibrium for undergraduate chemistry students, drawn from real CHE past exam papers and final exams. This bank covers 7 sections and 36 questions total, each with a full worked solution (first-time questions) or guided hints (practice questions): Section A — Fundamentals of Equilibrium & Kc/Kp Expressions Writing Kc and Kp expressions from balanced equations, identifying homogeneous vs. heterogeneous equilibria, and converting between Kc and Kp. Section B — Reaction Quotient (Q) & Direction of Equilibrium Using K to predict whether a mixture favors reactants or products, and comparing Q to K to determine which direction a system will shift. Section C — Relating Kp and Kc Applying Kp = Kc(RT)^Δn to convert between the two constants using gas-phase mole changes. Section D — Equilibrium Constant & Gibbs Free Energy Linking K to ΔG° using ΔG° = −RT ln K. Section E — Equilibrium Concentrations from ICE Tables Building I-C-E tables to solve for unknown equilibrium concentrations, including small-x approximations for very small K values. Section F — Le Chatelier's Principle Predicting shifts in equilibrium position from changes in concentration, temperature, and pressure — including multi-stress problems and reaction optimization (e.g. maximizing NH₃ yield). Section G — Solubility Product (Ksp) & Molar Solubility Writing Ksp expressions, calculating molar solubility in pure water and in common-ion solutions, and using Q vs. Ksp to predict precipitation. Every "first-time" question includes a full step-by-step worked solution with explanatory notes. Practice questions come with guided hints and common-mistake warnings only — attempt the full working yourself before checking the answer key on the final page. 📎 Full worked solutions inside. Premium members get complete access. 🔗 https://transcendedstudyhub.com/