HW7 - ta (mtt472) Homework 7 Sutcliffe (53120) 1 This...

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Unformatted text preview: ta (mtt472) Homework 7 Sutcliffe (53120) 1 This print-out should have 18 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. NOTE: Read the questions carefully. If it asks for a CHANGE (Delta) in a quantity or the VALUE of that quantity, then you must be sure to include the correct sign. Remem- ber that the quantities are for the SYSTEM, unless stated differently. This covers most but not all of Ch. 9 and the rest will be on HW8, the last HW. PLEASE NOTE the due date by checking the main page on Quest. As always, the deadline is 11pm. 001 10.0 points In the reaction of permanganate anion with iodide in acidic solution 2 MnO 4 + 16 H + + 10 I 2 Mn +2 + 8 H 2 O + 5 I 2 , what has been oxidized and what is its change in oxidation number? 1. oxygen; from- 1 to- 2 2. hydrogen; from +1 to 0 3. iodine; from- 10 to- 5 4. iodine; from- 1 to 0 5. manganese; from +7 to +5 002 10.0 points The oxidation numbers exhibited by iron in the red-brown oxide Fe 2 O 3 (iron rust), the greenish-black oxide FeO (unstable and al- most impossible to get pure) and the very unstable reddish-purple ferrate ion FeO 2 4 are 1.- 2,- 1, and- 4, respectively. 2. +3, +2, and +4, respectively. 3. +2, +1, and +6, respectively. 4.- 3,- 2, and- 8, respectively. 5.- 2,- 1, and- 6, respectively. 6. +2, +1, and +4, respectively. 7.- 3,- 2, and- 4, respectively. 8. +3, +2, and +8, respectively. 9.- 3,- 2, and- 6, respectively. 10. +3, +2, and +6, respectively. 003 10.0 points The combustion of a certain amount of methane gives off 100 kJ of energy. Dur- ing this process the amount of energy in the universe 1. The answer cannot be determined with- out knowing the heat capacity of methane....
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HW7 - ta (mtt472) Homework 7 Sutcliffe (53120) 1 This...

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