Chemistry 1109 Students in the eleventh grade learn the branches and languages of chemistry. They study chemical bonds, thermodynamics, mean, and standard deviation. Students study the atomic model, the nucleus of an atom, atomic weight, and mass number. They study development of Quantum Theory and Quantum Mechanics as well as Mendeleev's Contribution. Students learn about elements and energies and the physical properties of matter. Eleventh grade students study nuclear processes, organic chemistry and biochemistry, acids and bases, and reaction rates.