CHEM 001 Lecture Notes - Lecture 7: Calorimetry, Enthalpy, State Function
29 May 2020
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Document Summary
Law of conservation of energy is often called the first law of thermodynamics. Internal energy e of a system is the sum of the kinetic and potential energies of all the. To change the internal energy of a system: Q represents heat & w represents work. Sign reflects the system"s point of view. System does work on surroundings: w is negative. Surroundings do work on the system: w is positive work. H is the piston moving a distance. For an expanding gas, v is a positive quantity because the volume is increasing. Thus v and w must have opposite signs: w = p v. This equation holds for shrinking gas too! To convert between l atm and joules, use 1 l atm = 101. 3 j. enthalpy and. State function: h = e + pv. Specific heat capacity: the energy required to raise the temperature of one gram of a substance by one degree celsius.
