burge_ch5_notes

burge_ch5_notes - Chapter 5 Ionic and Covalent Bonds 2011...

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©2011 Donald L. Siegel, All Rights Reserved Chapter 5 Chapter 5 Ionic and Covalent Bonds
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©2011 Donald L. Siegel, All Rights Reserved What are bonds? What are bonds? W Because the nuclei cannot change, the formation of bonds has to involve the electrons W Because the inner core electrons are held so tightly, it must be the valence electrons
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©2011 Donald L. Siegel, All Rights Reserved Representing valence Representing valence electrons electrons W Lewis symbols are a convenient representation of atoms and their valence electrons W Symbol surrounded by one dot for each valence electron Location doesn’t matter Put paired electrons together
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©2011 Donald L. Siegel, All Rights Reserved Examples Examples H He : Li Be : B : C : N : :O : :F :
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©2011 Donald L. Siegel, All Rights Reserved Compounds Compounds W A form of matter that cannot be separated physically from another is called a pure substance W If a substance is composed of two or more elements, it is called a compound W Compounds obey the Law of Constant Composition All samples of a given compound contain the same ratio of elements W Compounds can be subdivided in several ways Organic vs. inorganic - organic compounds contain C Molecular vs. ionic
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©2011 Donald L. Siegel, All Rights Reserved Ionic Bonds Ionic Bonds W Ionic compounds are formed from the transfer of electrons W The coulombic attraction of cation and anion for each other are what hold in together This force is the so-called “ionic bond” Lewis formula shows the transferred electrons W Most stable configuration octet for elements past the first period duplet for the first period Noble gas-like configuration W Force holding ionic materials is called Lattice energy It is just Coloumb’s Law
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©2011 Donald L. Siegel, All Rights Reserved Coulomb Coulomb s Law in action s Law in action
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©2011 Donald L. Siegel, All Rights Reserved Ionic compounds Ionic compounds W Positively charged ions are called cations (pronounced cat’-ions) W Negatively charged ions are called anions (pronounced an’-ions) W Metallic elements tend to form cations, non-metals form anions
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©2011 Donald L. Siegel, All Rights Reserved Ionic Compounds Ionic Compounds
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©2011 Donald L. Siegel, All Rights Reserved Examples Examples Molecular Ionic
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©2011 Donald L. Siegel, All Rights
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burge_ch5_notes - Chapter 5 Ionic and Covalent Bonds 2011...

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