20 MORE Common Errors on the AP Chem Exam...and how to avoid them!

Get ready for the AP Chemistry exam with Dr V! Learn to avoid common errors in writing answers to free response questions and what to watch out for. Get tips for writing better answers to FRQ and feel more confident on test day! 00:00 - Introduction: How to Avoid AP Chem FRQ Errors 00:16 - Error 1: SigFigs in Calculations (The 2025 Exam Pitfall) 02:26 - Error 2: Signs in Enthalpy Changes (Q vs ΔH) 04:13 - Error 3: Stopping Multi-Step Calculations Early (pH vs. pOH) 05:55 - Error 4: Dilution Calculation Mistakes (M₁V₁=M₂V₂) 08:08 - Error 5: Writing Ksp Expressions (Charges & Brackets) 12:18 - Error 7: Q vs. K - Predicting Precipitate Formation 14:30 - Error 9: Coulomb's Law - Identifying Interacting Particles 16:52 - Error 10: Atomic Structure & Isotopes (Neutron Count) 17:55 - Error 11: Buffer Calculations (Ka Rearrangement Strategy) 21:04 - Error 12: Method of Initial Rates - Explaining Data 22:17 - Error 13: Combustion Analysis - The 2:1 Hydrogen Ratio 24:08 - Error 14: Particle Level Diagrams - Counting is Key! 25:47 - Error 15: Le Chatelier's Principle & Equilibrium Shifts 30:01 - Error 16: Explaining Entropy (Avoiding "Disorder") 32:03 - Error 17: Confusing Endo/Exothermic Temp Changes 34:07 - Error 18: Catalyst vs. Intermediate in Mechanisms 36:30 - Error 19: Gibbs Free Energy & Thermodynamic Favorability 41:02 - Error 20: Identifying Intermolecular Forces (IMFs) 44:42 - Drawing Hydrogen Bonds Correctly (Methanol & Formaldehyde) Note: at 22:00 I should say to compare trials 2 and 3...oops!