CHEM101 Lecture Notes - Lecture 1: Magnetic Quantum Number, Electromagnetic Radiation, Robert Andrews Millikan

• School: University of Alberta
• Department: Chemistry
• Course: CHEM101
• Professor: Ran Zhao

Document Summary

Law of conservation of mass - lavoisier (1789) Mass in an isolated system cannot be created or destroyed by chemical reactions or physical transformations. The mass of the products in a chemical reaction must equal the mass of the reactants. Law of definite proportions - proust (1799) A compound is always comprised of the same elements in the same fractions. A given chemical compound always contains the same elements in the exact same proportions by mass. Law of multiple proportions - dalton (1808) Compounds are formed by defined mass ratios of reacting elements. When elements form compounds, the proportions of those chemical compounds can be expressed in small whole number ratios. Dalton"s theory is a significant advance in chemistry but it is not perfect. #1: atoms have substructures (protons, electrons, and neutrons) Shows the existence of negatively charged particles (e-) This discovery obtained the mass to charge ratio. Experiment designed by r. millikan in 1909.