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Unit 7.5 Comparing Intermolecular Forces

Unit 7.5 Comparing Intermolecular Forces. Teacher: Dr. Van Der Sluys. Objectives. To determine Relative melting and boiling points Relative solubility of various combinations of compounds. Vocabulary. Solution - a homogeneous mixture of two or more compounds.

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Unit 7.5 Comparing Intermolecular Forces

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  1. Unit 7.5 Comparing Intermolecular Forces Teacher: Dr. Van Der Sluys

  2. Objectives • To determine • Relative melting and boiling points • Relative solubility of various combinations of compounds

  3. Vocabulary • Solution - a homogeneous mixture of two or more compounds. • Solvent - The compound that comprises the majority of a solution. • Solute - A minor component of a solution. • Aqueous solution - A mixture of liquid water and one or more solutes.

  4. Types of Bonding

  5. Like Dissolves Like • In order for a mixture to combine and become homogeneous on the molecular level, the compounds must have similar intermolecular bonding properties, i.e. ethanol and water. • Two compounds that have very different intermolecular forces will not mix and will produce a heterogeneous mixture, i.e. Italian salad dressing.

  6. Comparing Intermolecular Forces

  7. Comparing Intermolecular Forces

  8. Comparing Intermolecular Forces

  9. Comparing Intermolecular Forces

  10. Comparing Intermolecular Forces

  11. Melting and Boiling Points • The relative melting and boiling of various compounds are due to the strength of intermolecular forces. • If two compounds have the same types of intermolecular forces, the total number of electrons can usually be used to predict the degree of London dispersion forces. The compound with more electrons usually has the higher melting and boiling points. • For compounds with hydrogen bonding, the ratio of hydrogen atoms to lone pairs can be important.

  12. Comparing Intermolecular Forces

  13. Comparing Intermolecular Forces

  14. Comparing Intermolecular Forces

  15. Comparing Intermolecular Forces

  16. Summary • If compounds have similar intermolecular forces they tend to form homogeneous solutions, “like dissolves like.” • The strength of intermolecular forces can be used to predict relative melting and boiling points

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