1. Hydrolysis of magnesium chloride, aluminum chloride, and silicon tetrachloride with water, forming hydroxides and oxides. 2. Chloride ion titration in meat products, mole calculations, and ionic equations for sodium and potassium chlorides. 3. Iodination of benzene, enthalpy calculations for iodine formation, and oxidation state changes in iodine and nitrogen. 4. Nitrogen oxide catalysis in acid rain formation, explained with chemical equations and mechanisms. 5. Cu²⁺ electronic configuration, d-orbital splitting in transition metal complexes, and ammonia's effect on copper solution color. 6. Curcumin structure, functional group analysis, and reactions with bromine and KMnO₄ for product identification.