The Humphreys series is a group of lines in the spectrum of atomic hydrogen. It begins at 12 368nm and has been traced to 3281.4nm. What are the transitions involved? What are the wavelengths of the intermediate transitions?
Chemistry for Non-Science Majors Wednesday, January 27 Lecture Notes SHORT REVIEW FROM LAST CLASS: Ionic Bonds= metal + nonmetal (lose or gain electrons) Covalent Bond= 2 or more nonmetals (share electrons) Polyatomic Molecules= contains more than 2 atoms Atoms always want 8 valence electrons (electrons on their outer shell) ORGANIC CHEMISTRY Chemistry of carbon containing atoms We know more than 20 million chemical compounds, over 95% are compounds of Cm All organic molecules contain Hydrogen (H) and Carbon (C) o Some also contain O, N, P, S (Oxygen, Nitrogen, Phosphorus, Sulfur) Known as heteroatoms Compounds that contain only H and C = hydrocarbons o Simplest kind of organic compound HYDROCARBONS 2 groups of hyrdrocarbons: o Saturated Hydrocarbons= single covalent bonds, just C + H o Unsaturated Hydrocarbons= form double or triple bonds Saturated Hydrocarbons: o known as alkanes o All have tetrahedral geometry As long as C is forming a single bond it forms a tetrahedal Simplest organic compound= CH (meth4ne) o 2 ndsimplest org compound= C H (2th6ne) rd o 3 simplest org compound= C H (pro3a8e) Carbon always bonds to 4 atoms in all molecules ISOMERS Molecules can have the same molecular formula, but different structural representation o Example: Butane C H (4ee10elow)