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Liquids, Solids and Intermolecular Forces

Liquids, Solids and Intermolecular Forces. Question What types of molecular forces are present in H 2 CCl 4 SCO NH 3. The stronger intermolecular forces, the higher the melting/boiling point of subtances Dispersion (london) forces exist between all molecules

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Liquids, Solids and Intermolecular Forces

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  1. Liquids, Solids and Intermolecular Forces

  2. Question What types of molecular forces are present in H2 CCl4 SCO NH3

  3. The stronger intermolecular forces, the higher the melting/boiling point of subtances • Dispersion (london) forces exist between all molecules • As molar mases increases dispersion forces becomes stronger and the boiling point of subtances increase

  4. Question List the following subtances in order of increasing boiling points? BaCl2 H2 HF CO Ne

  5. List the following subtances in order of increasing boiling points?CCl4 Cl2 HF ClNO N2

  6. Comparetheboilingpoints of ethanolanddimetileter (theybothhavethesamesimpleformula C2H6O , MA=46,07) CH3CH2OH CH3OCH3

  7. Comparetheboilingpoints of CH3OCH3 (MA=46) and H2O (MA=18)

  8. Some Properties of Liquids and solids

  9. Solids are incompressible, do not flow. In a solid the structural particles (atoms, ions or molecules) are in direct contact and intermolecular forces hold them into a fixed volume and shape. Liquids are incompressible, flow readily. In a liquid atoms or molecules are close together and intermolecular forces are strong enough to hold them in a fixed volume but not a definite shape.

  10. Phase diagrams

  11. SupercriticalFluids

  12. Carbon dioxide

  13. Iodine

  14. Some Properties of Liquids • Cohesive Forces • Intermolecular forces between like molecules. • Adhesive Forces • Intermolecular forces between unlike molecules. • Surface Tension • The resistance of a liquid to spread out and increase its surface area. Energy or work required to increase the surface area of a liquid. • Viscosity • is an internal resistance to flow liquids with strong intermolecular attractions are generally more viscous than liquids with weak intermolecular attractions.

  15. Surface Tension • The resistance of a liquid to spread out and increase its surface area. • Energy or work required to increase the surface area of a liquid.

  16. liquid contains some molecules in the gaseous or vapor state, the partial pressure of these gaseous molecules in equilibrium with a liquid is called vapor pressure. The vapor pressure of a liquid always increases as temperature rises

  17. Question: an organic compound has a vapor pressure 0f 91.0 mmHg at 40°C. Calculate its vapor pressure at 25 °C, taking the heat of vaporization to be 5.31 x 104 J.mol

  18. Question: the vapor pressure of napyhalene (C10H8)at 25 °C is 0.300mmHg, • How many napthalene will sublime into an evacutaed 500.0ml flask?

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