Chemistry 21 Friday, October 20, 2006

Chemistry 21 Friday, October 20, 2006 - Friday, October 20,...

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Friday, October 20, 2006 Chemistry ORDER IN THE COURT! How can you determine if a reaction will go? Text: Sections 9.5 – 9.7 DOES A REACTION GO? 1. Cannot tell from chemical equation 2. Establish criteria to predict 3. Need to explain observations o Both endothermic and exothermic can go o H 2 O decomposition required constant input of E o Once started, H 2 + O 2 went all the way o H 2 + O 2 needed “ lighting” to start 4. Spontaneous process: a. Will happen by itself without continues outside assistance i. (balloon blowing up) (make no assumption about timescale) (Fast or slow) Depends on more than ∆ H ENTROPY (S) 1. Technically: a. # of ways E can be distributed Generally: # of ways a system can be arranged RESTRICTIONS ARRANGEMENT ENTROPY None Many High Touching Fewer Lower Fewest Lowest Lined up 2. S gas >> S liquid > S solid a. Fewer constraints = more “disorder” = higher S
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Friday, October 20, 2006 3. S highT > S lowT 4. 5.
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Chemistry 21 Friday, October 20, 2006 - Friday, October 20,...

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