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Unformatted text preview: 11/23/2008 1 Lecture 15: Intermolecular forces Great job on midterm! •85+ A •70-84 B •50-69 C Don’t get too excited. • Final counts more and is cumulative! • Will not have seen questions beforehand beforehand. • Must integrate concepts from different parts of course. Layout for next 3 lectures • Today: Intermolecular forces and structure, HW on boiling points and hydrogen bonds (chap 8.1,8.2,8.3,8.9) • Next Tuesday: Moles, molecular and empirical formulas (chap 1.15-20). • Next Thursday: Summary and integration. From single to many lonesome… getting things done States of Matter three states of matter: 11/23/2008 2 States of Matter gas liquid solid Special states: plasma Bose Einstein condensate Densities Changes of state • Solids melt to form liquids, or liquids freeze to form solids, at the melting point. • Liquids evaporate or boil into gases, or gases condense to form liquids, at the boiling point. • A few solids at 1 atm sublimate to gas. • BP’s and MP’s are affected by: – Molecular weight, intermolecular forces, shape Types of intermolecular forces • Depends on...
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- Fall '10
- Hydrogen Bond, Intermolecular force, Chemical polarity