Lecture18_upload

Lecture18_upload - Phase Changes Solid H2O (ice). As heat...

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Unformatted text preview: Phase Changes Solid H2O (ice). As heat is added, temperature rises (the ice gets warmer) Phase Changes Ice melting. Temperature is constant as heat is added. Phase Changes Liquid H2O (water). Temperature increases as heat is added. Phase Changes Water boiling. Temperature is constant as heat is added. Phase Changes Gaseous H2O (steam). Temperature increases as heat is added. Phase Changes Phase changes q = m · ∆ H Phase Changes For melting ∆ Hf = “heat of fusion” Phase Changes For boiling ∆ Hv = “heat of vaporization” Phase Changes During temp increases q = m · C · ∆ T Example How much heat must be added to convert 100 g of liquid water at 20.0°C completely to steam at 100°C? ∆ Hv = 2256 J/g ; C = 4.184 J/(g·K) A. 33.4 kJ B. 22.5 kJ C. 259 kJ D. 8368 J E. 122 kJ ? 44 kcal For Palm Sugar: Is this true ? Constant-volume calorimeter Constant-pressure calorimeter Measure H for a reaction Measure U for a reaction Example: Verifying nutritional label of palm sugar:...
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This note was uploaded on 02/27/2012 for the course CHEM 116 taught by Professor Stevenson during the Spring '08 term at Purdue.

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Lecture18_upload - Phase Changes Solid H2O (ice). As heat...

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