20 multiple-choice questions in College Board exam style. Each has four choices and a full explanation of why each option is right or wrong.
Always compare Q to K to predict direction. This single comparison answers most equilibrium-direction questions on the exam.
Leave pure solids and liquids out of equilibrium expressions. Only gases and aqueous species belong in K or Q.
Remember temperature changes K itself; concentration and volume changes only shift the position of equilibrium (not K).
Read the explanations even when you got it right. Each one teaches a small fact that often returns in a different form on the exam.