Liq-Sol1 - Section 12 Liquids and Solids Change of State...

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Section 12 Liquids and Solids Change of State Intermolecular Forces Molecular motion is rapid and random, but molecules maintain continuous contact. The average molecular kinetic energy is enough to oppose placement of molecules in a rigid crystal lattice. Assumes shape of container as defined by gravity Only slightly compressible The Liquid Phase
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Vaporization… Molecules with sufficiently high kinetic energies may overcome intermolecular attractive forces and escape to the gaseous state
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The tendency to vaporize increases dramatically with… increased temperature
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Kinetic energy needed to overcome Intermolecular forces in liquid Molecules with enough KE to vaporize at T 1
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As high KE molecules escape, the average KE and T of the remaining liquid decreases. Heat from surroundings must be added to maintain the liquid’s original T… Kinetic energy needed to overcome Intermolecular forces in liquid Molecules with enough KE to vaporize at T 2
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Liq-Sol1 - Section 12 Liquids and Solids Change of State...

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