1. Dipole-Dipole and Ion-Dipole Interactions By: Katlyn, Christina, Jonathan, Jeet

2. Intermolecular Forces Attraction between two molecules Van der Waals wanted to test the behavior and the strength of the bonds liquids - The weak intermolecular bonds in liquids and solids Categorized in three groups: dipole-dipole, dipole- induced dipole, induced dipole-induced dipole

3. Dipole-Dipole Forces When polar molecules come in contact with each other partially positive end of a molecule is attracted to a partially negative end and vice-versa. strength of intermolecular attractions increases with increasing polarity for molecules with about equal mass and size The bonds are stronger in solids(more closely packed together) than in liquids(molecules are loose)

4. Dipole-Dipole Forces Not as strong as an ionic bond but is usually stronger than London forces Great effect only when the polar molecules are close together Hydrogen bonding is a type of dipole-dipole bonding.

5. Dipole-Dipole Forces The HCl, or the hydrochloric acid, is attracted to one another through dipole-dipole forces. The partially positive hydrogen is attracted to the partially negative chlorine. The water molecule is attracted to the other water molecules through dipole-dipole forces. The partially positive hydrogen is attracted to the partially negative oxygen. This is also considered a hydrogen bond, because the force of attraction between the hydrogen of one molecule to an electronegative element, which is oxygen.

6. Check it Out! http://www.yteach.co.za/index.php/resources/intermolecular_ force_matter_dipol_polar_non_polar_dispersion_hydrogen_b onding_t_page_11.html http://www.yteach.co.za/index.php/resources/intermolecular_ force_matter_dipol_polar_non_polar_dispersion_hydrogen_b onding_t_page_11.html http://antoine.frostburg.edu/chem/senese/101/liquids/faq/h- bonding-vs-london-forces.shtml http://antoine.frostburg.edu/chem/senese/101/liquids/faq/h- bonding-vs-london-forces.shtml

7. Ion-Dipole Forces between an ion and a polar molecule cations are attracted to the partially negative ends of a neutral polar molecule, while anions are attracted to the partially positive ends of a neutral polar molecule the most commonly found in solution and is very important for an ionic compound in a polar liquid. becomes stronger as the charge on the ion changes or the magnitude of the polarity of the polar molecule increases

8. Ion-Dipole Forces The cation and anion are attracted to the polar molecules. The anion is attracted to the positive end of the polar molecule, while the cation is attracted to the negative end of the polar molecule. The cation, the Na, attracts the oxygen molecules. The positively charged cation is attracted to the negatively charged oxygen polar molecule.

9. Check it Out! http://www.sumanasinc.com/webcontent/animations/content /propertiesofwater/water.html http://www.sumanasinc.com/webcontent/animations/content /propertiesofwater/water.html

10. Comparison Similarities Both interactions are between a positively charged end of a molecule with a negatively charged end of a molecule Differences Dipole-Dipole interactions are between two polar molecules, while Ion-Dipole interactions are between an ionic compound and a polar compound Ion-Dipole has a stronger bond than a Dipole- Dipole bond

11. Bibliography http://chemed.chem.purdue.edu/genchem/topicreview/bp/intermol/intermol.ht ml#force http://chemed.chem.purdue.edu/genchem/topicreview/bp/intermol/intermol.ht ml#force http://www.chem.purdue.edu/gchelp/liquids/dipdip.html http://abeliaschemistry.blogspot.com/p/dipole-dipole-forces.html http://www.sumanasinc.com/webcontent/animations/content/propertiesofwate r/water.html http://www.sumanasinc.com/webcontent/animations/content/propertiesofwate r/water.html http://antoine.frostburg.edu/chem/senese/101/liquids/faq/h-bonding-vs- london-forces.shtml http://antoine.frostburg.edu/chem/senese/101/liquids/faq/h-bonding-vs- london-forces.shtml http://www.yteach.co.za/index.php/resources/intermolecular_force_matter_dip ol_polar_non_polar_dispersion_hydrogen_bonding_t_page_11.html http://www.yteach.co.za/index.php/resources/intermolecular_force_matter_dip ol_polar_non_polar_dispersion_hydrogen_bonding_t_page_11.html