This document contains a chemistry exam with multiple choice and subjective questions covering various topics: 1. The multiple choice section contains 17 questions testing concepts like the octet rule, standard enthalpy change, pH calculations, cathode materials in batteries, percentage compositions, and isotopes. 2. The subjective section asks students to define key terms, explain concepts like limiting reactants and gas behavior, solve problems involving electron mass and molecular formula determination, and balance a chemical equation. 3. Students must also answer 3 out of 7 multi-part essay questions covering topics such as liquid crystals, combustion analysis, Dalton's law of partial pressures, electronegativity, bomb calorimetry, and colligative properties.