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Structure, Polarity & Physical Properties

Structure, Polarity & Physical Properties

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Structure, Polarity & Physical Properties

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  1. Structure, Polarity & Physical Properties Supplemental packet handouts 92-96

  2. Supplemental packet page 92 ~80% ~20% trace triple bond double bond single bond inert supports combustion explosive The order of stability often parallels the bond order; 3, 2, 1. Stability is directly related to bond energy. Bond energy is defined as the amount of energy required to break a bond holding two atom together. triple bond > double bond > single bond Bond order 3 2 1 Strength strongest weakest

  3. Supplemental packet page 92

  4. Supplemental packet page 93 bond dipole

  5. Supplemental packet page 93 Polar molecules have a NET DIPOLE NONpolar molecules DON’T have a NET DIPOLE B. Molecular Polarity - A molecule is polar if1. its centers of positive and negative charge do not coincide. 2. a molecule behaves as a dipole a3. possesses a dipole moment.

  6. Balloon Bending Water Demostration

  7. Supplemental packet page 93 solids at 25°C liquid at 25°C gases at 25°C really sticking around strong physical attractions sticking around moderate physical attractions when tempers flare weak physical attractions The strength of a physical attraction between molecules will determine how tolerant a molecule is of temperature

  8. Changes in Physical State The addition of thermal energy (when tempers flare) • causes changes in physical state • physical attractions change NOT chemical bonds as (temperature) thermal energy is added to a substance

  9. Supplemental packet page 94 polar molecules are high boiling than nonpolar molecules hydrogen bonding > dipole-dipole Water (l) is higher boiling than HCl(g)

  10. Supplemental packet page 99

  11. Supplemental packet page 96 Study this graph and view the physical properties powerpoint Also work the problems on supplemental packet page 97.