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Chem Lec 20100908 - Welcome to Chemistry 110 Chemistry...

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Welcome to Welcome to Chemistry 110 Chemistry 110 General Chemistry General Chemistry Prof. Ian Butler Dept. of Chemistry Otto Maass Bldg. Room 427 Tel: 514-398-6910 OFFICE HOURS OFFICE HOURS Mondays: 2:00-4:00 pm (unless otherwise stated) Otto Maass Chemistry Building Room 427 FINAL EXAMINATION FOR CHEM 110 THE EXAMINATION PERIOD IS BETWEEN DECEMBER 6-21, 2010, INCLUSIVE. DO NOT MAKE ANY TRAVEL PLANS BEFORE DECEMBER 22, 2010 LABORATORY QUESTIONS LABORATORY QUESTIONS All questions about laboratory schedules and related problems should be directed directly to Dr. Jean-Marc Gauthier either through webCT or by going to Room 1 in the basement of the Otto Maass Chemistry Building. A scanned version of this book will be on sale at the Bookstore next week. ~$30 THE BEGINNING OF THE COURSE!
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Electromagnetic Force Coulomb’s law: charged bodies Force on Body 1 by Body 2 (charges q 1 q 2 ) 1,2 2 o 2 1 1,2 r 4 ° q q (r) F ° ± ² ³ ´ µ = ε ° 1 2 1,2 ε o = Permittivity of free space = 8.854 x 10 -12 F . m -1 Electromagnetic Force Electromagnetic Force Opposite charges: q 1 q 2 < 0 Body 1 is pushed toward Body 2: Attraction 1,2 2 o 2 1 1,2 r 4 ° q q (r) F ° ± ² ³ ´ µ = ε ° 1 2 1,2 1,2 F ° “Opposites attract”! Electromagnetic Force Electromagnetic Force Like charges: q 1 q 2 > 0 Body 1 pushed away from Body 2: Repulsion 1,2 2 o 2 1 1,2 r 4 ° q q (r) F ° ± ² ³ ´ µ = ε ° 1 2 1,2 1,2 F ° Electromagnetic Force Electromagnetic Force Like charges: q 1 q 2 > 0 Body 1 pushed away from Body 2: Repulsion 1,2 2 o 2 1 1,2 r 4 ° q q (r) F ° ± ² ³ ´ µ = ε ° 1 2 1,2 1,2 F ° “Likes repel”! Electromagnetic Force Coulomb’s law: charged bodies Force depends on the square of the distance 1,2 2 o 2 1 1,2 r 4 ° q q (r) F ° ± ² ³ ´ µ = ε ° 1 2 1,2 “Inverse square law”
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Electromagnetic Force Electromagnetic Force Electromagnetic force “rules” in Chemistry Attraction & repulsion influence properties e - e - Repulsion between electrons Electromagnetic Force Electromagnetic force “rules” in Chemistry Attraction & repulsion influence properties p + e - Attraction between electrons & protons Review: Atomic Structure Chap. 2 Review: Atomic Structure Chap. 2-3 Electrons carry negative charge Small “particles” (wavelike properties too!) They define the extent of an atom 10 -10 m = 0.1 nm = 1 Å Electron “cloud” Review: Atomic Structure Chap. 2 Review: Atomic Structure Chap. 2-3 Nucleus Positively charged protons Neutral neutrons 10 -10 m = 0.1 nm = 1 Å 10 -14 m = 10 fm Nucleus Review Atomic Review Atomic “ Particles Particles” Chap. 2 Chap. 2-3 Protons: mass 1.673 x 10 -27 kg Neutrons: mass 1.675 x 10 -27 kg Electron: mass 9.109 x 10 -31 kg + Proton: p atomic charge +1 SI units: +1.602 x 10 -19 C Neutron: n neutral charge - Electron: e atomic charge -1 SI units: -1.602 x 10 -19 C Elements and Isotopes Chap. 2 Elements and Isotopes Chap. 2-4 Element : identical atoms, same atomic no.
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