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Chemical Bonding

Chemical Bonding. LET ’ S REVIEW…. How do atoms form chemical bonds?. Why do atoms form bonds?. By gaining, losing, or sharing electrons. To attain a noble gas configuration. A + B  AB. When a bond formed = energy is released = reaction is exothermic. B reaking a Bond

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Chemical Bonding

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  1. Chemical Bonding LET’S REVIEW…

  2. How do atoms form chemical bonds? Why do atoms form bonds? By gaining, losing, or sharing electrons To attain a noble gas configuration

  3. A + B  AB When a bond formed = energy is released = reaction is exothermic

  4. Breaking a Bond Absorbs Energy (endothermic)!

  5. Ionic Bonding Occurs between? (type of elements) Electrons (shared or transferred?) • Metals and nonmetals • Transferred, metal loses, nonmetal gains

  6. Ionic Bonding Type of structure? Properties • Crystal Lattice • High Boiling Point, High Melting Point, Hard, Brittle, Conduct electricity if melted or in solution (dissolved in water)

  7. Metallic Bonding Occurs between? (type of elements) Electrons (shared or transferred?) • Metals • Mobile sea of electrons

  8. Metallic Bonding Type of structure? Properties • Crystal Lattice • High Boiling Point, High Melting Point, Hard, Good Conductors electricity

  9. Covalent Bonding Occurs between? (type of elements) Electrons (shared or transferred?) • Nonmetals only • shared

  10. Covalent Bonding Type of structure? Properties • Molecules – held together by IMF (intermolecular forces) • Low Boiling Point, Low Melting Point, soft, poor conductors of electricity

  11. CH4 Cu SO2 NaCl H2O CsF Covalent Ionic Ionic Mg Na2S Li3N Metallic Ionic Metallic CO2 Ag Au Covalent Metallic CaBr2 Al2O3 CH3OH Ionic Ionic Al N2O5 ZnO Ionic Metallic Identify Bond Type from Formula Covalent Covalent Metallic Ionic Covalent Covalent

  12. So what? Why is structure so important? Structure determines physical properties!

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