Intermolcular

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the difference of physical properties (boiling point, freezing point) based on differences in intermolecular forces (van der Waals forces, London forces, and hydrogen bonding)

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Intermolcular

  1. 1. Chemistry<br />
  2. 2. Water<br />?<br />Boiling point<br />
  3. 3. have the same boiling point??<br />X<br />Y<br />
  4. 4. the difference of physical properties (boiling point, freezing point) based on differences in intermolecular forces (van der Waals forces, London forces, and hydrogen bonding).<br />
  5. 5. There are three <br />intermolecular forces<br />Let’ssee<br />
  6. 6. Quizz<br />Which of the following has the lowest boiling point?O2 F2 Cl2<br />Fill the blank below.Boiling point and freezing point of polar molecules are ….. than non polar molecules.<br />Higher Lower<br />Which of the following has the highest boiling point?HI CH4 H2O<br />
  7. 7. For non polar molecules, only intermolecular force of attraction is London force<br />London force stronger for larger molecules, weaker for smaller molecules<br />Which of the following has the lowest boiling point?<br />O2 F2 Cl2<br />
  8. 8. Which of the following has the lowest boiling point?<br />O2 F2 Cl2<br />Atomic size decreases across a row (left to right). F is smaller than O. F2 is smaller than O2<br />Atomic size increases going down a column. F is smaller than Cl. F2 smaller than Cl2<br />
  9. 9. relative molecular mass >><br />london force >><br />Boiling point and freezing point increase<br />>><br />Butane<br />Pentane<br />
  10. 10. For polarmolecules, not only intermolecular force of attraction is London force. There is dipole-dipole force.<br />intermolecular force in polarmolecules is stronger than intermolecular force in non polar molecules.<br />Boiling point and freezing point of polarmolecules is higher than non polar molecules.<br />
  11. 11. Freezing point<br />Boiling point<br />relative molecular mass<br />
  12. 12. Hydrogen bonding is much stronger than the van der Waals force.<br />Energy to break the hydrogen bond is about 15-40 kJ / mol while for the van der Waals force of about 2-20 kJ / mol.<br />That is why the substances that have a hydrogen bond has a higher freezing point, and boiling point<br />
  13. 13. Higher boiling point is due to stronger<br />intermolecular forces. Lower boiling point<br />is due to weaker intermolecular force.<br />Hydrogen<br />bonding<br />Dipole-dipole<br />force<br />London<br />force<br />A<br />B<br />C<br />1st<br />2nd<br />3rd<br />Which one that have highest boiling point?<br />
  14. 14. Hydrogen<br />bonding<br />Dipole-dipole<br />force<br />London<br />force<br />H2O<br />HI<br />CH4<br />1st<br />2nd<br />3rd<br />

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