CHEM 130 Lecture Notes - Lecture 4: Boiling Point, Bromine, Caesium
16 Sep 2016
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Changes of state: solid melts > liquid, solid sublimes > gas, melting - turning from solid to liquid at a certain melting point, freezing - turning from liquid to solid at a certain freezing point, heat of fusion. Amount of heat released when 1 g of liquid freezes (at its freezing point) The amount of heat needed to melt 1 g of solid (at its melting point) 79. 8 cal/1 g h2o or 334j/1g h2o: heat of vaporization is the amount of heat. Absorbed to change 1 g of liquid to gad at the normal boiling point. Released when 1 g of gas changes to liquid at the boiling point. Boiling point of water = 100 c. Heat of vaporization of water = 540 cal/1 g h2o or 2260j/1 g h2o: sublimation and deposition. Occurs when a solid changes directly to a gas. Typical of dry ice which sublimes at -78 c.
