1 / 9

Unit Nine Review

Unit Nine Review. IMF. Intermolecular forces Attractive forces between molecules The three states of matter depend on Strength of IMF relative to the amount of thermal energy Weaker IMF Gas Stronger IMF Solid or liquid. IMF. Surface tension Tendency of liquids to minimize surface area

kemal
Download Presentation

Unit Nine Review

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. Unit Nine Review

  2. IMF • Intermolecular forces • Attractive forces between molecules • The three states of matter depend on • Strength of IMF relative to the amount of thermal energy • Weaker IMF • Gas • Stronger IMF • Solid or liquid

  3. IMF • Surface tension • Tendency of liquids to minimize surface area • Stronger IMF, greater surface tension • Viscosity • Resistance of a liquid to flow • Stronger IMF, greater viscosity • Volatile • Easily evaporates • Dynamic equilibrium • Rate of condensation = rate of evaporation • Vapors condensing = liquid evaporating • Vapor pressure • Pressure exerted by a liquids vapor molecules

  4. Phase Change • Melting • Solid to liquid • Freezing • Liquid to solid • Boiling • Liquid to gas • Condensation • Gas to liquid • Sublimation • Solid to gas • Deposition • Gas to solid • Boiling occurs throughout the liquid • Evaporation occurs only at the surface • Rate of Vaporization increases • Increase surface area • Increase temperature • Decrease strength of IMF • Vapor pressure increases • Decrease strength of IMF • Increase temperature • Make a liquid boil • Increase temperature • Decrease atm pressure (lowers bp) • Make a gas condense • Decrease temperature • Increase atm pressure

  5. Calculations • Be able to use the • Heat of vaporization (boiling/condensing plateau) • Heat of fusion (melting/freezing plateau) • Specific Heat (slope) • q=mCΔT equations to calculate the energy required

  6. Types of IMF • Dispersion • Temporary uneven distribution of electrons • Molar mass • Symmetry • Surface area • Dipole – Dipole • Permanent uneven distribution of electrons • Hydrogen Bonds • H bonded to N, O, or F

  7. Solids • Molecular • Neutral corners • Low melting points • NM & NM • M & ML or ML & NM • Covalent • Neutral corners • High melting points • ML & ML • M & ML or ML & NM • Metallic • Positive ions (cations) • M & M • Ionic • Positive and negative ions (cations and anions) • M & NM

  8. Water • Why is water unique? • Hydrate calculations (Worksheet 4)

More Related