1 / 11

Bonding…

Bonding…. Intra molecular Forces. Bonds that occur between ATOMS Example: H-O-H, the bonds that hold the H to the O are called intramolecular forces. Relatively strong bonds 2 main types of bonds that are based on their strength Covalent Ionic Which is stronger??. Covalent vs. Ionic.

derry
Télécharger la présentation

Bonding…

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Bonding…

  2. Intramolecular Forces • Bonds that occur between ATOMS • Example: H-O-H, the bonds that hold the H to the O are called intramolecular forces. • Relatively strong bonds • 2 main types of bonds that are based on their strength • Covalent • Ionic • Which is stronger??

  3. Covalent vs. Ionic • Covalent • Share electrons • Liquids or gases at room temp • Do not form crystals • Poor conductors of electricity • Stronger bonds b/t atoms • No attraction b/t ions • Low m.p. and b.p.

  4. Ionic • Transfer electrons • Solids at room temp • Tend to form crystal structures • Good conductors of electricity • Weaker bonds b/t atoms • High attraction b/t ions surrounding each other • High m.p. and b.p

  5. Why do ionic cmpds have a high m.p. and b.p? Cl- Na+ The bond between the Na and Cl is not as strong as a covalent bond would be Cl- Na+ But, the attraction between the (-) and (+) ions over and over again, makes for a really strong attraction increasing the m.p. and b.p.

  6. Intermolecular Forces • Bonds that occur between MOLECULES • Example: You have several water molecules bonded together. The forces holding them are intermolecular forces. • Much weaker bonds than intramolecular forces • 3 main types based on strength of their bond • London Dispersion Forces • Dipole-Dipole • Hydrogen Bonds

  7. London Dispersion Forces • Weakest of all intermolecular forces • Occurs between nonpolar covalent molecules and solids with low melting points • Why would molecules with LD forces have low melting points? • Examples: H2, N2, Cl2, paradichlorobenzene

  8. Dipole-Dipole • Stronger than LD forces, but weaker than intramolecular forces • Occurs between polar covalent molecules • Medium m.p. and b.p. of the 3 intermolecular forces • Examples: HCl, H2S • Don’t get too hung up on what is polar covalent not testing that again right now

  9. Hydrogen Bonds • Strongest of the 3 intermolecular forces, but weaker than intramolecular forces • Attraction between polar molecules that contain hydrogen bonded to one of the following: fluorine, nitrogen, or oxygen • Will have the highest m.p. and b.p. of the 3 intermolecular foces

  10. van der Waals forces • These are the two weakest intermolecular forces combined • London Dispersion • Dipole-Dipole

  11. Intra- molecular Forces Inter- molecular Forces Increasing Strength of Bond van der Waals Forces

More Related