Quizzes_ch_16-19

Quizzes_ch_16-19 - Shriver Ch 16 The Group 17 Elements 1....

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Shriver Ch 16 The Group 17 Elements 1. The halogens have high electron affinity because: a. They can accommodate only one electron in their valence shell; therefore the energy required for this process is low. b. The incoming electron can occupy an orbital of an incomplete valence shell and thus experience strong nuclear attraction. c. The nuclear attraction to the electrons in their atoms is high and tends to draw new electrons in. 2. All group 17 elements: a. undergo thermal or photochemical dissociation in the gas phase to form free radicals b. are gases at room temperature c. sublimate easily 3. Why are aqueous fluoride solutions not used in the production of fluorine by electrolysis? a. because fluorides are insoluble in water b. because water is oxidized at a much lower potential than F and because any F 2 produced would react rapidly with the water c. because the electrolysis of water solutions of fluorides would require a prohibitively large amount of water and energy 4. Fluorine atoms are small and their electrons are tightly gripped by the nucleus. Therefore, molecular fluorine compounds have: a. high polarizabilities and strong dispersion interactions b. low polarizabilities and strong dispersion interactions c. low polarizabilities and weak dispersion interactions 5. What is the molecular geometry of ClF 3 as predicted by VSEPR? a. trigonal bipyramidal b. trigonal pyramidal c. trigonal planar 6. When I 2 is added to a solution containing I , a deep brown color develops. How can that phenomenon be explained? a. I is oxidized to I 2 . b. I 2 is dissolved in the water. c. Polyiodides, such as I 3 and I 5 , are formed. 7. Perchlorate is a very weak Brønsted base and a weak Lewis base and is used as a weakly coordinating ion that can be easily displaced from a complex by other ligands. When using the perchlorate ion in this situation, care must be taken because: a. The perchlorate ion is a powerful oxidizing agent that can explode unexpectedly and unpredictably. b. The perchlorate ion is a powerful oxidizing agent that rapidly oxidizes the ligands before complexes are formed for further study. c. The perchlorate ion is a powerful oxidizing agent that rapidly oxidizes the metal acceptors before complexes are formed for further study. 8. Basic solutions of chlorine, bromine, and iodine undergo _____, with the formation of +1 (XO ) and –1 (X ) species: a. oxidation b. reduction c. disproportionation 9. The oxidation of molecules and ions by halogen oxoanions increases in the order: a. ClO 2 < ClO 3 < ClO 4 b. ClO 4 < BrO 4 < IO 4 c. IO 3 < IO 4 10. Why must care be taken during the high-temperature depolymerization of polytetrafluoroethylene (PTFE)? a. because the monomer, tetrafluoroethylene, is highly toxic
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Quizzes_ch_16-19 - Shriver Ch 16 The Group 17 Elements 1....

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