quiz2ans-02 - 1 Name:_ Student Number_ Chemistry 1000 A, V...

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Name:_____________________________________________ Student Number_______________ Chemistry 1000 A, V Midterm Test #2 November 15, 2002 Calculators allowed. Make sure this test has 5 pages. Part A. Answer each question with a few sentences or equations where necessary. (5 Marks each) 1. What are the oxidation numbers of each atom in Fe(OH) 3 ? O -2 H +1 Fe +3 2. Why can SO 2 act as either an oxidant or a reducing agent? Sulfur can have oxidation states from +6 to -2. The sulfur atom has an oxidation state of +4 in SO 2 . Thus, the sulfur in SO 2 could be reduced or oxidized, and therefore can act as an oxidant or a reducing agent. 3. Cleaning up your house has a negative value of S, since disorder is reduced. Why does this activity increase the entropy of the Universe? The act of cleaning up your house involves the expenditure of energy, i.e. it is exothermic. This will cause the surroundings to warm, increasing the entropy of the surroundings, and therefore increasing the entropy of the Universe as well. 4. Consider two ways of going from nitrogen and oxygen to nitrogen dioxide: 1. ½ N 2(g) + O 2(g) . NO 2(g) 2. ½ N 2(g) + ½ O 2(g) NO (g) followed by NO (g) + ½ O 2(g) NO 2(g) Compare the two systems in terms of the overall H, S and G of reaction. Since sum of the reactions in the second system is the same as the reaction in the first system, the two
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This note was uploaded on 12/24/2009 for the course BIOLOGY 1003 taught by Professor Suzannepaterson during the Fall '09 term at Carleton CA.

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quiz2ans-02 - 1 Name:_ Student Number_ Chemistry 1000 A, V...

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