Chemistry 101 Notes Week 4: Lewis Structures, VSEPR theory, AXE class, Geometry and Shape
Chemistry 101 Notes Week 4: Lewis Structures, VSEPR theory, AXE class, Geometry and Shape 101
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This 4 page Class Notes was uploaded by Satori Le on Friday September 18, 2015. The Class Notes belongs to 101 at Washington State University taught by Michael Finnegan in Fall 2015. Since its upload, it has received 255 views. For similar materials see Chemistry in Chemistry at Washington State University.
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Date Created: 09/18/15
September 14 2015 Exam 1116 24 quizzes 13 HW 14 lab WS 2and experiment 5 Lewis Structure for nitrate ion N03 O 139 DD can move double bonds to other O39s 0 Resona nce Structures 0 Structures with the same sequence of atoms but different bonding patterns quotquotquot o If resonance exists you must draw all possible structures that obey the octet rule Sulfur dioxide 502 6e2 6e 18e Exceptions to the octet rule BF3 F B F 3e37e24e F BECIz CI Be C 2e2 7e 16e Molecules and polyatomic ions can be classi ed by AXE type AXnEm N the of bonding groups around the central atom Any bond single double or triple is one bonding group M the number of lone pairs on the central atom VSEPR theory 0 Groups valence electrons around an atom will tend to stay as far apart from each other as possible 0 Geometry electron geometry is the arrangement of electron groups around the central atom o shape molecular shape the arrangement of atoms or bonds around the central atoms the book calls its molecular geometry September 16 2015 Type AXE Class Geometry addition Molecular Type if of subscripts E0 type is same as geometry C02 AX2E0 Linear Linear CO AX1E1 Linear Linear CIO439 AX4E0 Tetrahedral tetrahedral NO339 AX3E0 Trigonal planar Trigonal planar 502 AX2E1 Trigonal planar Bent BF3 AX3E0 Trigonal planar Trigonal planar BeC2 AX2E0 Linear Linear E lone pairs around central atom X branching off structures refer to the Lewis structure Six AXE possibilities Polar molecules work the same as polar bonds 0 Polar molecule 0 A molecule that has a positive and negative end 0 A molecule will be polar if it has polar bonds and is asymmetric about the central atom ln symmetric molecules the polar bonds are positioned so that the polarities oppose each other and cancel Such molecules are non polar even though they have polar bonds OOOO Symmetric non polar Asymmetric polar Triangle shape tends to be non polar Bent tends to be polar September 18 2015 Name Lewis AXE Geometr Shape Bond 3D SKetch structur Class y polarity e Selenium O Se AX2E1 Trigonal Bent Se 0 SE dioxide 0 planar l Se02 O O Formaldehy O AX3E0 Trigonal Trigonal C O 0 de CH20 planar planar C H H H C H I C H H Chlorometh CI AX4E0 Tetrahedr Tetrahedr C CI ane a a D I CH3C H C H C H 3quotquot tr I D H l H H H HCN H C AXZEO Linear Linear C N H C N N D D C H Polar D PBr3 Br P AX3E1 Tetrahedr Trigonal P Br 222pm Br a pyramid D mo Blr l Br Br CCI4 AX4E0 Tetrahedr Tetrahedr l 3 C al al C CI 7 CI C fl C CI CIOZ39 OC AX2E2 Tetrahedr Bent CI 0 CI O39 al I OO
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