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Warm-Up 1/10/14

Take the next 5-10 minutes to complete the water mini-lab. After seeing what happens, write 3+ sentences explaining what you saw and what you think this has to do with the concept of polarity. Warm-Up 1/10/14. Attractions Between Molecules: Intermolecular Forces. Fri day 1/10/14.

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Warm-Up 1/10/14

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  1. Take the next 5-10 minutes to complete the water mini-lab. After seeing what happens, write 3+ sentences explaining what you saw and what you think this has to do with the concept of polarity. Warm-Up 1/10/14

  2. Attractions Between Molecules: Intermolecular Forces Friday 1/10/14

  3. Types: Ionic, Covalent (polar and nonpolar) • Electrons are being shared or transferred between ATOMS. Summary: Bonds Between Atoms

  4. How are molecules held together?? There must be something, or materials would never stick together.

  5. Inter: Between, Molecular: Molecules • Forces that attract molecules to other molecules. These include: • Dipole-dipole attraction • Hydrogen bonding • London dispersion forces Intermolecular Forces

  6. NOTE: Intermolecular Forces are NOT bonds!!!! Friends don’t let friends make this mistake!!

  7. Attraction between oppositely charged regions of neighboring POLAR molecules. Dipole-Dipole Attraction Dipole-dipole attraction in hydrogen chloride, a gas that is used to make hydrochloric acid

  8. Attractions between the semi-positive H atoms with the semi-negative N, O, and F atoms. Hydrogen Bonding: A Special Type of Dipole-Dipole Ex) Base pairing in DNA by hydrogen bonding

  9. Hydrogen Bonding in Water

  10. Hydrogen bonds are very strong. Evidence: High boiling point of water and high surface tension

  11. Temporary attractive force that results when the electrons in two adjacent atoms occupy positions that make the atoms form temporary dipoles • Electrons are in constant motion, so atoms can have areas that are temporarily + or - • This type of force is always present for all categories of molecules (polar or not) London Dispersion Forces

  12. These are the only forces of attraction between completely nonpolarmolecules • The strength of LDFs is proportional to a molecule’s size (weight) • Large nonpolar molecules may have substantial dispersion forces • Small nonpolar molecules have weak dispersion forces and exist almost exclusively as gases

  13. More LDFs

  14. What intermolecular forces exist between ammonia (NH3) and water (H2O) molecules? • Always exists for all molecules: _________________ • Is it polar? What does that mean? • Does it have the correct atoms for H-Bonding? Example

  15. Complete questions 1-6 on the Intermolecular Forces Worksheet. (We will finish the rest another day) • Reminder: Quest next Wednesday Your Job

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