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Intermolecular Forces

Intermolecular Forces. Chapter 4. Intermolecular Forces. Intermolecular forces - also called molecular attraction . Are forces of attraction between stable molecules. Example: hydrogen bonds (see section 3-3). Two types of IM forces:.

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Intermolecular Forces

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  1. Intermolecular Forces Chapter 4

  2. Intermolecular Forces • Intermolecular forces - also called molecular attraction. • Are forces of attraction between stable molecules. • Example: hydrogen bonds (see section 3-3).

  3. Two types of IM forces: • Cohesion - intermolecular force of attraction between LIKE molecules. • Adhesion - intermolecular force of attraction between DIFFERENT molecules.

  4. Intermolecular Forces • Why do they occur? • Due to differences in charge densities or uneven distribution of electrons!

  5. Polar vs. Non-Polar Molecules • Polar - unequal distribution of charge means a great amount of attraction between molecules. • Non-Polar - equal distribution of charge means a weak attraction between molecules.

  6. Do Polar and Non-Polar Solutions Mix? • Polar solutions mix with other polar solutions! • Example: Milk and water. • Non-polar solutions mix with other non-polar solutions! • Example: Oil and grease. • Polar solutions will NEVER mix with non-polar solutions! • Example: Italian salad dressing.

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