PChem312 f20 w3

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Monday, Aug 31, 2020

Continue reading chapter 2

Sec 2.1: Internal Energy and !st Law of Thermodynamics

U <-- internal energy (1st thermodynamic state function)

Uf - Ui = ΔU, the change in the internal energy
  • we cannot measure Uf or Ui, only ΔU.

First Law of Thermodynamics: the change in the system's internal energy is equal to, but opposite in sign, to the change in the surround's internal energy.

ΔUsys = - ΔUsurr

How does one measure ΔU?

- changes in the system variables (ΔP, ΔV, ΔT, Δn) are an indication of ΔU.
ΔP, ΔV, ΔT, Δn --> q (heat), w (work) --> ΔU

Sec 2.2: Heat

Sec 2.2: Work

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