MCAT CHEM6 Kaplan Review | 90+ Questions | Equilibrium, Le Chatelier, Keq vs Q, Thermodynamic Control

This expert-verified Kaplan MCAT CHEM6 resource contains 90+ Q&A flashcards focused on chemical equilibrium, tailored for the MCAT Chemical and Physical Foundations section. With simplified breakdowns of concepts like reaction quotient (Q), equilibrium constant (Keq), and Le Chatelier’s principle, it prepares pre-med students for logic-heavy MCAT problems involving reaction direction, concentrations, and temperature/pressure effects. Key concepts covered: Dynamic equilibrium: reactions still occur, but forward and reverse rates are equal Law of Mass Action: Keq = [C]^c[D]^d / [A]^a[B]^b, only for gases and aqueous ions (not solids or pure liquids) Difference between Q and Keq: Q < Keq → forward reaction favored (–ΔG) Q = Keq → equilibrium (ΔG = 0) Q > Keq → reverse reaction favored (+ΔG) Le Chatelier’s Principle: system shifts to oppose applied stress Δ[Concentration], Δ[Pressure]/Volume, ΔTemperature ↑Pressure = shift toward side with fewer moles of gas ↓Temperature = shift toward heat-producing direction Kinetic vs Thermodynamic control: Kinetic product forms faster at low temp, less stable Thermodynamic product forms slower, more stable, lower ΔG Real-world application: carbonated beverages and gas equilibrium Sample Keq calculations using balanced chemical equations (e.g., Haber process N₂ + 3H₂ ⇌ 2NH₃) Application of Ka/pKa to pH and acid-base behavior Reversibility and Keq inversion: if reaction is reversed, Keq becomes 1/Keq This document is highly valuable for: MCAT candidates needing conceptual and formula-based equilibrium practice Students in General Chemistry, Physical Chemistry, and Intro to Thermodynamics Reinforcement of graph-based, logic-based, and data-based MCAT chemistry questions Keywords: chemical equilibrium, Keq, reaction quotient, Q vs Keq, Le Chatelier’s principle, equilibrium constant, dynamic equilibrium, Gibbs free energy, reversible reactions, pressure effect, temperature effect, reaction direction, kinetic control, thermodynamic product, rate vs stability, Ka, pKa, MCAT chemistry, Kaplan CHEM6