Lec17 Solids and its Properties

# Lec17 Solids and its Properties - SOLID AND ITS PROPERTIES...

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LMALaput Chemistry 16 Lecture 17 SOLID AND ITS PROPERTIES 1. Melting Point of Solids 2. Heat Transfer involving Solids 3. Sublimation and Vapor Pressure 4. Phase diagrams 5. Amorphous and Crystalline solids 6. Structures of Crystals 7. Bonding in Solids 8. Band Theory of Metals MELTING POINT The normal melting point is the temperature at which the solid melts (liquid and solid in equilibrium) at exactly 1.00 atm of pressure. The melting point increases as the strength of the intermolecular attractions increase. The normal melting point is the temperature at which the solid melts (liquid and solid in equilibrium) at exactly 1.00 atm of pressure. The melting point increases as the strength of the intermolecular attractions increase. The melting point of a solid is same as the freezing point of its liquid. HEAT TRANSFER INVOLVING SOLIDS Heat of fusion is the amount of heat required to melt one gram of a solid at its melting point at constant temperature. Heat of crystallization is the reverse of the heat of fusion. The molar heat of fusion is the amount of heat required to melt a mole of a substance at its melting point. The molar heat of crystallization is the reverse of molar heat of fusion Calculate the amount of heat required to convert 150.0 g of ice at -10.0°C to water at 40.0° C. Specific heat of ice is 2.09 J/g° C ?J= ( ) ( ) ( ) ?J = ( ) ( ) ?J = ( ) ( ) ( ) (3.14 + 5.01 + 2.51) x 10 4 J = 7.83 x 10 4 J SUBLIMATION AND VAPOR PRESSURE OF SOLIDS In the sublimation process the solid transforms directly to the vapor phase without passing through the liquid phase.

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