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Lecture 13 Enthalpy; Heating Curves

# Lecture 13 Enthalpy; Heating Curves - Lec-13 Enthalpy...

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h l Lec-13: Enthalpy; Heating Curves Roy A. Lacey, Stony Brook University; Che 131, Spring 2011 1 Systems Roy A. Lacey, Stony Brook University; Che 131, Spring 2011 2

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Heat Flow ` In an exothermic process, heat flows from a system into its surroundings. ` In an endothermic process, heat flows from the surroundings into the system. Roy A. Lacey, Stony Brook University; Che 131, Spring 2011 3 Systems A system is characterized by state variables (P, T, V, n) state variables (P, T, V, n) A change in conditions is a change of state . Physical change (eg gas expansion) Physical change (eg. gas expansion) • Chemical change (eg. reaction) For chemical systems we focus on the initial For chemical systems we focus on the initial and final conditions Roy A. Lacey, Stony Brook University; Che 131, Spring 2011 4
System Energy H Here ` The internal energy of a system is the sum of all the KE and PE of all of the sum of all the KE and PE of all of the components of the system. Roy A. Lacey, Stony Brook University; Che 131, Spring 2011 5 State Function Why is the state function so important ? Distance between two cities is a Distance between two cities is a state function , but distance traveled is a path function Roy A. Lacey, Stony Brook University; Che 131, Spring 2011 6

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State Functions The internal energy E is a state function state function Roy A. Lacey, Stony Brook University; Che 131, Spring 2011 7 First law of thermodynamics Energy cannot be created nor destroyed.
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Lecture 13 Enthalpy; Heating Curves - Lec-13 Enthalpy...

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