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UMass Amherst CHEM 261 - Syllabus Overview, Energy Levels, Electron Configurations

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Lecture 1CHEM 261 1st EditionOutline of Last Lecture:N/AOutline of Current Lecture:I. Outline Syllabus II. What is Organic ChemistryIII. Atomic StructureCurrent Lecture:I. Outline Syllabus Lecture: MWF, ISB 135, 4:00-4:50Office Hours: LGRT 745C, M 1:30-3:30, Th 3:30-5:30Exams: Exam 1: February 25 (Wed)- 25%Exam 2: April 1 (Wed)- 25%Final Exam: May 6 (Wed)-30%OWL Assignments: Given on a weekly basis- 20% 5 attempts per question, only end of chapter questions requiredElectronic Necessities:Textbook: Organic Chemistry, John McMurray (comes with purchase of owl)Moodle: Course announcements, syllabus, lecture notes, exam slot polling, etc.OWL: course- related activities and assignments (should buy 24 month OWL to cover Chem 261 and Chem 262, includes online textbook)iClicker: provide feedback in lecture, course exercises, etc. Tips from Professor Farkas:- Go to class-Read ahead-Buy and use molecular models (and bring them to class!)-Use available resources (TA/SI/office hours, OWL problems, etc.)-Pace yourself/don’t try to learn or do everything all at onceII. What is Organic Chemistry?- “the study of primarily carbon-based compounds”-Why is this important?-90% of more than 30 million chemical compounds contain carbon-Earth life is completely dependent upon organic chemistry -Organic compounds can be either simple or complex, and so are useful models for theories of chemical bonding and reactivityiii. Atomic Structure-Atomic number (Z) : number of protons in the nucleus of an atom**nucleus=protons and neutrons (positively charged and small) , electrons orbit nucleus, are in a cloud around it, with a diameter ~2 x10-10 m, or 200 picometers** 1 angstrom (A) = 10-10 m = 100 pm(Most of organic chemistry is, “where are the electrons?” or “to where are they moving?”)-Mass number(A): number of protons and neutrons in the nucleus of an atom-All atoms of an element have the same atomic number! What can change is the mass numberIsotope: atoms of the same element that have a different number of neutrons, which causes them to have a different massAtomic Mass: (atomic weight) of an element is the weighted average mass in atomic mass units (amu) of an element’s naturally occurring isotopesWhere are the electrons?s-orbital: spherical shape, nucleus is at the center. No nodesp-orbital: dumbbell shape, nucleus in the middle. One noded-orbital: Energy Levels:-p orbitals in the same shell are perpendicular (px, py, pz)Class example: Energy Level Diagram-Carbon atomHow many e- in carbon?


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