Metallic Bonds and Bond Energy - PowerPoint PPT Presentation

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Metallic Bonds and Bond Energy

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  1. Metallic Bonds and Bond Energy

  2. Metallic Bond • Bond that exists between metal atoms • Alloy – two or more different metal atoms bonded together

  3. Electron Sea Model • Metal atoms give up valence electrons and form + ions • The released electrons move freely around the + metal ions

  4. Properties of Metallic Bonds • Good conductors of electricity – free electrons • Malleable and ductile – not in rigid position so ions can be shaped and drawn into wires • Conduct heat because of free electrons • Lusterous – absorb and emit light in regular pattern due to free electrons

  5. Bond Energy • Energy, in kJ, required to break a bond in 1 mole of a compound • Bond energies given in Table 8.4 (pg. 373)

  6. Enthalpy (H) • Bond energies can be used to calculate an approximate energy of reaction • H can be thought of as the energies required to break old bonds plus the energies released when new bonds are formed H = D(bonds broken) - D(bonds formed)

  7. Example • Use bond energies to calculate the H for the reaction of methane with chlorine and fluorine to give freon (CF2Cl2) CH4 + 2Cl2 + 2F2 CF2Cl2 + 2HF + 2HCl

  8. Homework • Pg. 407 # 47 – 55 (odd)