UNLV CHEM 103 - Lecture 10 (36 pages)

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Lecture 10



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Lecture 10

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Lecture Notes


Pages:
36
School:
University of Nevada, Las Vegas
Course:
Chem 103 - Preparatory Chemistry
Preparatory Chemistry Documents

Unformatted text preview:

Chemistry 103 Lecture 10 EXAM I Survey How did you do on this exam Grade range don t give your actual score Did your performance meet your expectations Did you complete and check the practice exam Did you finish all homework If you did not meet your performance expectations what will you do differently next time Please list any recommendations for improving the course Outline EXAM I SURVEY I Ionic Compounds in review Nomenclature Polyatomic Ions Nomenclature II Covalent Compounds Lewis Dot Diagrams Lewis structures Nomenclature Properties predicted Bonds Ionic Bonds electron transfer process Typically between a metal and a nonmetals Covalent Bonds electrons shared Typically involving nonmetals Ionic and Covalent Bonds Atoms acquire octets To become more stable By losing gaining or sharing valence electrons By forming ionic bonds or covalent bonds Copyright 2005 by Pearson Education Inc Publishing as Benjamin Cummings Metal Ions Why Are They Positive Let s look at Mg Its electron configuration is 1s22s22p63s2 If it loses two electrons to become Mg2 it will have the electron configuration 1s22s22p6 If it gains 6 electrons to become Mg6 it will have the electron configuration 1s22s22p63s23p6 8 Valence Electrons 8 Valence Electrons The question is which is easier To lose TWO electrons or to gain SIX Losing two Therefore Mg tends to form Mg2 ions Nonmetal Ions Why Are They Negative Let s look at Cl Its electron configuration is 1s22s22p63s23p5 If it loses seven electrons to become Cl7 it will have the electron configuration 1s22s22p6 If it gains 1 electron to become Cl it will have the electron configuration 1s22s22p63s23p6 8 Valence Electrons 8 Valence Electrons The question is which is easier To lose SEVEN electrons or to gain ONE Gaining ONE Therefore Cl tends to form Cl ions Elements in a Compound Table salt is a compound that contains the elements sodium and chlorine Copyright 2005 by Pearson Education Inc Publishing as Benjamin Cummings Salt is An Ionic Compound



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