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I. Kinetic Molecular Theory KMT

I. Kinetic Molecular Theory KMT. Assumptions of KMT. All matter is composed of tiny particles These particles are in constant, random motion. Some particles are moving fast, some are moving slowly.

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I. Kinetic Molecular Theory KMT

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  1. I. Kinetic Molecular TheoryKMT

  2. Assumptions of KMT • All matter is composed of tiny particles • These particles are in constant, random motion. • Some particles are moving fast, some are moving slowly. • Temperature is a measure of the average Kinetic Energy and is proportional to the average speed of the molecules.

  3. KMT Model • http://preparatorychemistry.com/Bishop_KMT_frames.htm • Click on the link above to see how particles of matter behave according to the KMT.

  4. Liquids & Solids II. Intermolecular Forces

  5. Definition of IMF • Attractive forces between molecules. • Much weaker than chemical bonds within molecules. • a.k.a. van der Waals forces

  6. Types of IMF • London Dispersion Forces View animation online.

  7. + - Types of IMF • Dipole-Dipole Forces View animation online.

  8. Types of IMF • Hydrogen Bonding

  9. Types of IMF

  10. Ion-Dipole • Attraction between an Ion and a polar covalent bond (dipole) • IMF responsible for salts dissolving in water. • Strength determines salt solubility.

  11. Liquids & Solids III. Physical Properties

  12. LIQUIDS Stronger than in gases Y high N slower than in gases SOLIDS Very strong N high N extremely slow Liquids vs. Solids IMF Strength Fluid Density Compressible Diffusion

  13. Liquid Properties • Surface Tension • attractive force between particles in a liquid that minimizes surface area

  14. water mercury Liquid Properties • Capillary Action • attractive force between the surface of a liquid and the surface of a solid

  15. decreasing m.p. Types of Solids • Crystalline - repeating geometric pattern • covalent network • metallic • ionic • covalent molecular • Amorphous - no geometric pattern

  16. Types of Solids Ionic (NaCl) Metallic

  17. Types of Solids Covalent Molecular (H2O) Covalent Network (SiO2 - quartz) Amorphous (SiO2 - glass)

  18. Solvation In Aqueous Solutions • Solvation – process of surrounding solute particles with solvent particles Why are some substances soluble in a solvent and some others are not? must be compatibility between solute and solvent

  19. “like dissolves like” • Defn – rule used to determine if substance will dissolve in another - based on attractive forces between solute and solvent

  20. Solubility • Defn – max amt of solute that can dissolve in a solvent at a specific temp how much solute can be put into solvent?

  21. Unsaturated Solution • Defn – less than max amt of solute dissolved if I put sugar into water and all sugar is dissolved, solution is unsaturated

  22. Saturated Solution • Defn – contains max amt of solute dissolved if I put sugar into water and not dissolves (you can see the sugar), the solution is saturated

  23. Supersaturated Solution • Defn – contains more solute than saturated solution at the same conditions a saturated solution made at high temp cools slowly. Slow cooling allows excess solute to remain dissolved in solution at lower temperature very unstable

  24. Curve represents max amount solute allowed Solubility Curve (generic) Saturated (above line) Solubility (g solute/ 100 g H2O) Unsaturated (below line) Temperature

  25. Solubility Rules • Some ions always form water soluble compounds. • Other ions always form water insoluble compounds • The rest are sometimes water soluble and sometimes insoluble

  26. Always Soluble • The following ions are always soluble, no matter what the other ion is. • Group IA (Li, Na…) • Ammonium (NH4+) • Nitrates (NO3-) • Chlorates (ClO3-) • Acetates (C2H3O2-)

  27. Almost always soluble • Halides (Cl, Br…) • Except for fluorides • Except for silver, mercury(I) and lead • Sulfates • Except for barium, calcium, lead, mercury(I)

  28. Mostly insoluble • Hydroxide (OH-) • Except for barium, strontium and calcium (these ARE soluble along with the always soluble ions) • Sulfides, carbonates, chromates, and phosphates.

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