10-26-10 - Lecture 9 - Chapter 6

10-26-10 - Lecture 9 - Chapter 6 - Energy and Change of...

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Energy and Change of State Energy (heat) must be added to cause a substance to vaporize
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Heat Transfer and Heat Transfer and Changes of State Changes of State Requires energy (heat). This is the reason a) you cool down after swimming b) you use water to put out a fire. + energy Liquid Liquid Vapor Vapor
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Changes in State Vaporization – liquid to gas (requires energy) Condensation – gas to liquid (releases energy) Fusion (melting) – solid to liquid (requires energy) Sublimation – solid to gas (requires energy) Freezing – liquid to solid (releases energy)
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Enthalpy of physical change Enthalpy of vaporization: ∆H vap = H vapor – H liquid Enthalpy of fusion: ∆H fus = H liquid – H solid
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Enthalpy To obtain the enthalpy change for the reverse of any process, take the negative of the enthalpy change for the original process. Enthalpy Initial state Final state ∆H ־ ∆H ∆H (reverse process) = ־ ∆H (forward process)
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Since enthalpy is a state
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This note was uploaded on 01/05/2011 for the course CHEM 6A taught by Professor Pomeroy during the Fall '08 term at UCSD.

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10-26-10 - Lecture 9 - Chapter 6 - Energy and Change of...

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