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Announcements

Stay updated with Lon-Capa announcements! The 5th HW assignment is due on Friday, 10/21 by 5 pm, and the 4th Quiz is due on Sunday, 10/23 by 10 pm. Don't forget about Exam 2 on Tuesday, October 25, same rooms as Exam 1. Equation sheet will be available online. Office hours on Tuesday at 1 pm instead of 10 am.

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Announcements

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  1. Announcements • Lon-Capa: 5th HW assignment due Friday 10/21 by 5 pm. • Lon-Capa: 4th Quiz due Sunday, 1023 by 10 pm. Opens Friday 10/21 at 5 pm. • Exam 2 is Tuesday, October 25; rooms the same as Exam 1; equation sheet posted online. • Office hours Tuesday: 1 pm, not 10 am

  2. Higher temp: more “spread”

  3. Clicker Question Consider the process: H2O(g)  H2O(l). Are Ssurrand S thermodynamically favorable or unfavorable? SsurrS a) favorable favorable b) favorable unfavorable c) unfavorable favorable d) unfavorable unfavorable e) I do not know.

  4. Spontaneous or Not?

  5. Characteristics of Ssurr • The sign of Ssurrdepends on whether the reaction or process is exothermic (Ssurr >0 or “favorable”) or endothermic (Ssurr < 0 or “unfavorable”). • The magnitude of Ssurrdepends on the temperature. • To increase the effect of Ssurr, lower the temperature. • To decrease the effect of Ssurr, raise the temperature. • LeChatelier’s principle!

  6. A Question to Consider CalculateS and Suniv when 50.0 g of ice at 0C is dropped into 100.0 g of water at 75C in a perfectly insulated vessel and briefly discuss these numbers to show that all of the ice will indeed spontaneously melt. • Hfusion for ice is 6.02 kJ/mol at 0C and Cp for water is 75.3 J/Kmol • Assume Cp is constant over the temperature range in question.

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