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CHEMISTRY 161 Chapter 9 Chemical Bonding I chem.hawaii/Bil301/welcome.html

CHEMISTRY 161 Chapter 9 Chemical Bonding I www.chem.hawaii.edu/Bil301/welcome.html. THE OCTET RULE. atoms combine to form compounds in an attempt to obtain a stable noble gas electron configuration. ns 2 np 6. IONIC BONDING. COVALENT BONDING. COVALENT BONDING. F. F. F. F.

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CHEMISTRY 161 Chapter 9 Chemical Bonding I chem.hawaii/Bil301/welcome.html

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  1. CHEMISTRY 161 Chapter 9 Chemical Bonding I www.chem.hawaii.edu/Bil301/welcome.html

  2. THE OCTET RULE atoms combine to form compounds in an attempt to obtain a stable noble gas electron configuration ns2np6

  3. IONIC BONDING COVALENT BONDING

  4. COVALENT BONDING F F F F THE OCTET RULE sharing electrons (electron pair) electronic configuration of F is 1s22s22p5

  5. F F F F F F + non-bonding, or lone pair of electrons bonding pair of electrons

  6. H2is the simplest covalent molecule + H H H H + the bond length of H2 is the distance where the total energy of the molecule is minimum

  7. EXAMPLES NH3 HX H2O CH4 single bonds O2 CO2 C2H4 double bonds C2H2 N2 HCN triple bonds transition metal compounds w/ halides quadruple bonds

  8. EXAMPLES NH3 HX H2O CH4 O2 CO2 C2H4 C2H2 N2 HCN

  9. few thousands kJ/mol

  10. IONIC OR COVALENT electronegativity difference between the two atoms involved in the bond

  11. ELECTRONEGATIVITY Li C N O F Na S Cl K Br Rb I Cs Ba Fr Ra is the tendency of an atom in a bond to attract shared electrons to itself F > O > N, Cl > Br > I, C, S …….. Na, Ba, Ra > K, Rb > Cs, Fr Electronegativity increases energies of the atomic orbital with the unpaired electron

  12. ELECTRONEGATIVITY Li C N O F Na S Cl P K Br Rb I Cs Ba Fr Ra F > O > N, Cl > Br > I, C, S …….. Na, Ba, Ra > K, Rb > Cs, Fr Electronegativity increases Se F is the most electronegative H has an electronegativity about the same a P

  13. IONIC VERSUS COVALENT BONDS bonds are neither completely ionic nor covalent (only in homonuclear molecules)

  14. IONIC VERSUS COVALENT BONDS compounds composed of elements with large difference in ELECTRONEGATIVITY significant ionic character in their bonding B has greater electronegativity A B

  15. IONIC VERSUS COVALENT BONDS B has a greater share A B

  16. H F H F HYDROGEN FLUORIDE Fluorine is more electronegative than hydrogen. + +

  17. H F H F HYDROGEN FLUORIDE Fluorine is more electronegative than hydrogen. + + d+ d– This is a polar covalent bond. The bond has a partly ionic and partly covalent nature.

  18. Variation of ionic character with electronegativity.

  19. H2O2 NF3 CO32- NO3- OF2 HCOOH H2CO CH3COOH

  20. SUMMARY IONIC BONDING COVALENT BONDING

  21. Homework Chapter 9 pages 338-346, problem sets

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