Lecture_27 - Today's Lecture Liquids and Solids 16.1...

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1 1 Liquids and Solids Today’s Lecture 16.1 Intermolecular Forces 1 Physical States of Matter ± Gas ± assumes shape of its container ± completely fills a container ± easily compressed ± low densities ± Solid ± maintains its own shape (regardless of its container) ± virtually incompressible Red Beryl, Be 3 Al 2 Si 6 O 18 2 ± high densities ± Liquid ± haspropert iesinbetweenthoseofso l idsandgasesbut are more similar to solids (e.g. density of water and ice are quite close)
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2 2 Physical States of Matter (cont’d) 3 General conclusion: the liquid and solid states have many similarities but both are very different from the gaseous state Figure 16.1 - Schematic representations of the 3 states of matter Intermolecular Forces ± intramolecular forces ± forces acting between two atoms within a molecule (i.e. sharing of electrons between two atoms - covalent bonding) ± butwhataretheforcesthatcausetheaggregat ionofthe individual components to form liquids and solids? ± these forces may involve covalent or ionic bonding or weaker interactions usually called intermolecular forces 4 ± intermolecular forces ± forces acting between molecules
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3 3 Types of Intermolecular Forces ± Dipole-Dipole Forces ± London Dispersion Forces collectively called van der Waals forces ± Dipole –Dipole Forces ± recall that polar molecules have a net dipole moment (i.e.
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Lecture_27 - Today's Lecture Liquids and Solids 16.1...

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