CHEMhmwk10 - Weinelt, Karl Homework 10 Due: Nov 24 2003,...

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Unformatted text preview: Weinelt, Karl Homework 10 Due: Nov 24 2003, midnight Inst: Donna Lyon 1 Thisprint-outshouldhave29questions, check that it is complete. Multiple-choice questions may continue on the next column or page: find all choices before making your selection. The due time is Central time. HW 10 is due on Monday, November 24th, by midnight. 001 (part 1 of 1) 10 points Give the oxidation numbers for copper in the compound Cu 2 O and for Mo in the compound Mo 2 O 2- 7 , where oxygen maintains an oxida- tion number of- 2. 1. +2, +7 2. +1, +1 3. 0,- 2 4. +1, +12 5. +2, +6 6. 0, 0 7. +1, +6 002 (part 1 of 1) 10 points In the redox conversion of Br- to BrO- 3 , the oxidation number of Br goes from ? to ? . Recall that the oxidation number of oxygen is typically- 2. 1.- 1, +1 2.- 1, +6 3. +1, +1 4. +1, +6 5. 0, +5 6. 0, +6 7. 0, +1 8.- 1, +5 9. +1, +5 003 (part 1 of 1) 10 points Assign oxidation numbers to each atom in H 2 O 2 . 1. H = 0, O = 0 2. H = +1, O =- 2 3. H =- 1, O = +2 4. H =- 2, O = +1 5. H = +1, O =- 1 004 (part 1 of 1) 10 points Depending on conditions, vanadium forms any of 4 different cations VO 2 + (light yellow), V 2+ (violet), VO 2+ (blue), or V 3+ (green) in acid solution. The oxidation numbers exhibited by vana- dium in these ions are 1. +5, +2, +4, and +3, respectively. 2. +1, +2, +2 and, +3, respectively. 3.- 1,- 2,- 2, and- 3, respectively. 4.- 5,- 2,- 4, and- 3, respectively. 005 (part 1 of 1) 10 points Reduction is represented by 1. Na + + e- Na. 2. Cl- 1 2 Cl 2 + e- . 3. Cu Cu 2+ + 2 e- . 4. a loss of electrons. 006 (part 1 of 1) 10 points Iron reacts with oxygen especially rapidly in the presence of water to produce the familiar Weinelt, Karl Homework 10 Due: Nov 24 2003, midnight Inst: Donna Lyon 2 reddish brown rust according to the equation 4Fe + 3O 2 +?H 2 O 2Fe 2 O 3 , where ? H 2 O represents a non-specific num- ber of water molecules....
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CHEMhmwk10 - Weinelt, Karl Homework 10 Due: Nov 24 2003,...

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