11-5 - C HE M ISTRY 106 REC ITAT ION QU IZ 2/25 Name Section 1A Consider a hot tamale(206 g fresh out of the oven The hot tamale is p laced in a

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Unformatted text preview: C HE M ISTRY 106 REC ITAT ION QU IZ ( 2/25) Name __________________________________________ Section ________ 1A. Consider a hot tamale (206 g) fresh out of the oven. The hot tamale is p laced in a plastic container, and sealed with a lid. Init ially the container is 293 K, but the hot tamale is 330 K. When the tamale cools down to room temperature, what is the change i n entropy for the tamale (system). The heat capacity of the tamale is 6.34 J/g·K. 1B. What is the change in entropy for the container (surroundings) neglecting heat losses out of the container? 1C. What is the change in the entropy of the universe? 1D. What is the change in the entropy of the universe if we change our focus from the t amale as the system to the container as the system? 2. A solution contains 2.0x10-4 M A g+ and 1.5x10-3 M Pb2+. If NaI is added, will AgI (K sp = 8.3 x10-17) or PbI 2 ( K sp = 7.9x10-9) precipitate fi rst? Specify the concentration of I - needed to begin precipitation. 3. In your own words, briefly explain the three laws of thermodynamics. 1. 2. 3. 4. A solution containing an unknown metal ion is t reated with dilute HCl and a precipitate forms. Based on this observation, which metal ions are possibly present in the solution? ...
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This note was uploaded on 04/06/2011 for the course CHEM 106 taught by Professor Herron,s during the Fall '08 term at BYU.

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11-5 - C HE M ISTRY 106 REC ITAT ION QU IZ 2/25 Name Section 1A Consider a hot tamale(206 g fresh out of the oven The hot tamale is p laced in a

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