Chemistry 121, Week 7 Notes
Chemistry 121, Week 7 Notes 121
Popular in General Chemistry I
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This 2 page Class Notes was uploaded by Brigette Honaker on Friday October 14, 2016. The Class Notes belongs to 121 at University of North Dakota taught by Dr. David Pierce in Fall 2016. Since its upload, it has received 3 views. For similar materials see General Chemistry I in Chemistry at University of North Dakota.
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Date Created: 10/14/16
Week Seven Wednesday, October 5, 2016 3:02 PM October 3rd, 2016 Chemical Bonds (4.1) Ionic bonds: electrons transferred between atoms Covalent bonds: electrons shared between atoms Ionic vs Covalent Bonding o Compounds show different behavior o We can gauge electron sharing based on electronegativity o Electronegativity is goes down from right to left and from top to bottom Naming Molecular Compounds (4.5) Binary naming because there are only 2 elements Prefix - en prefix - en - ide o Ex: N2O3= dinitrogen trioxide October 5th, 2016 Electron Dot Structures (4.7) Nonmetals o Nonmetals share their valence electrons o Shared pair of electrons: covalent bond o Nonmetals share enough electrons to complete their octet (or duplet) Atoms can share more than one pair of electrons What is bonded to what in polyatomic molecules? o Central atom has the lowest electronegativity; the trend continues outwards. o Arrangement should be symmetrical October 7th, 2016 Expanded Octects (4.8) Some atoms have extra room for valence electrons o P and S have an expanded d octet Resonance Structures (4.9) Equivalent octet rule structures Same atom arrangement but different electron pairing Formal Charge (4.10) Calculate formal charge for each atom in the structure Sum of formal charge = charge of structure Best structures have minimal formal charges of atoms