Exam01answersvr217 - Cheung, Anthony Exam 1 Due: Sep 27...

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Unformatted text preview: Cheung, Anthony Exam 1 Due: Sep 27 2006, 1:00 pm Inst: McCord 1 This print-out should have 21 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. The due time is Central time. 001 (part 1 of 1) 10 points Electron affinity corresponds to the energy released or absorbed in which process (for atom A)? 1. None of these 2. A + e- A- correct 3. A 50 electron volt electron collides with A to give A + + 2 e- . 4. A A + + e- 5. A A + + 2 e- Explanation: Electron affinity is defined as the amount of energy absorbed in the process in which an electron is added to a neutral isolated gaseous atom to form a gaseous ion with a- 1 charge. This is represented by the equation A + e- A- . 002 (part 1 of 1) 12 points Calculate the wavelength of radiation with a frequency of 5 10 14 per second. Correct answer: 6 10- 7 meters. Explanation: 003 (part 1 of 1) 10 points Which of the following best describes the range of atomic radii? 1. 1 to 100 A 2. 0.4 to 3 A correct 3. 1 to 15 A 4. 10 to 30 A 5. 0.05 to 1 A 6. 5 to 10 A Explanation: Atomic radii vary from 30 pm (He) to 300 pm (Fr). 1 A= 10- 10 m = 100 pm, so the range of atomic radii is 0.3 to 3 A. 004 (part 1 of 1) 10 points Rank the following in terms of decreasing ionic radii. 1. F- , O 2- , N 3- , Na + , Mg 2+ 2. Mg 2+ , Na + , F- , O 2- , N 3- 3. Na + , Mg 2+ , N 3- , O 2- , F- 4. Na + , Mg 2+ , O 2- , N 3- , F- 5. N 3- , O 2- , F- , Na + , Mg 2+ correct Explanation: We only consider ions that yield a Noble gas configuration (Na + , Mg 2+ , O 2- , N 3- , and F- ). We are comparing ions with the same number of electrons: 10 total and 8 valence in this case. The number of protons in the ion is the biggest determinate of the size when electron number is constant....
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Exam01answersvr217 - Cheung, Anthony Exam 1 Due: Sep 27...

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