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 check the sign convention in ΔG = ΔH − TΔS carefully. A favorable process needs ΔG < 0, which depends on the signs of ΔH, ΔS, and the value of T.
Thermodynamic favorability and reaction rate are unrelated. Don't assume a favorable reaction happens quickly — that's a kinetics question.
Oxidation always happens at the anode, reduction always happens at the cathode — in both galvanic and electrolytic cells.
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.