Exam01answers pg5 - We only consider ions that yield a...

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Unformatted text preview: We only consider ions that yield a Noble gas configuration (Na+ , Mg2+ , O2− , N3− , 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. # e− N3− O2− F − + 2. True correct Explanation: 017 (part 1 of 1) 12 points Calculate the wavelength of radiation with a frequency of 4.9 ×1014 per second. Correct answer: 6.12245 × 10−7 meters. Explanation: 018 (part 1 of 1) 10 points Electron affinity corresponds to the energy released or absorbed in which process (for atom A)? 1. A → A+ + 2 e− 2. A 50 electron volt electron collides with A to give A+ + 2 e− . 3. A → A+ + e− 4. None of these 5. A + e− → A− correct 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− . 019 (part 1 of 1) 13 points The average speed of a helium atom at 25◦ C is 1.23 × 103 m/s. What is the average wavelength of a helium atom at this temperature? 1. 2.03 × 10−11 m 2. 4.06 × 10−11 m 3. 8.11 × 10−11 m correct 4. 7.43 × 10−15 m 5. 4.15 × 10−12 m Explanation: val. inner prot. 8 8 8 8 8 2 2 2 2 2 7 8 9 11 12 eff. charge +5 +6 +7 +9 +10 10 10 10 10 10 Na Mg 2+ The greater the effective nuclear charge, the stronger the attraction between the protons and the electrons, and thus the smaller the radii. 015 (part 1 of 1) 10 points Assume n1 and n2 are two adjacent energy levels of an atom. The emission of radiation with the longest wavelength would occur for which two values of n1 and n2 ? 1. 4,5 2. 5,6 3. 3,4 4. 7,8 correct 5. 2,3 6. 6,7 7. 1,2 Explanation: 016 (part 1 of 1) 8 points Particles of light are called photons and they have no mass and no charge. 1. False ...
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This note was uploaded on 01/23/2011 for the course CH 301 taught by Professor Fakhreddine/lyon during the Spring '07 term at University of Texas at Austin.

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