Chem208_Lecture_21_BW - Today Thermodynamics(Chapter 19...

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1 Today: Thermodynamics (Chapter 19) Exam coverage: Chapters 15–18, 24 PS9 will go out in lecture on Thursday Exam II: Tonight, 7:30-9:00 Room Assignments are shown on last Tuesday’s handout
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2 Spontaneous Changes A spontaneous change is a change that, once begun, has a tendency to occur without being driven by an external influence. A spontaneous change does not necessarily occur rapidly.
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3 Thermodynamics What determines whether a process will proceed spontaneously? H 2 O ( l ) H 2 0 ( s ) or H 2 O ( s ) H 2 0 ( l ) 2 H 2 ( g ) + O 2 ( g ) 2 H 2 0 ( i ) or 2 H 2 O ( l ) 2 H 2 ( g ) + O 2 ( g )
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4 Natural Pattern Energy and matter tend to become more disordered (or random) The quantitative measure of this disorder or randomness is known as Entropy
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5 Second Law of Thermodynamics The entropy of the universe increases in the
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