Exam 1-2.2 - 14 E. 4.1 x 10-19 5. The density of gold is...

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EXAM I Sample Exam 1-2 Dr. V. Williamson © Vickie M. Williamson 2007, All Rights Reserved 1 1. Calculate the formula weight (molar mass) of (NH 4 ) 2 S 4 0 6 . A. 356 B. 242 C. 260 D. 288 E. 63 2. How many grams of oxygen atoms are in 65 g of C 2 H 2 O 2 A. 22 B. 36 C. 11 D. 18 E. 72 3. The ionization energy is higher for oxygen than for beryllium. Which statement(s) account for this: I. An increase in the numbers of electron shells. II. An increase in the effective nuclear charge. III. An increase in the atomic radius. A. II and III. B. III only C. I and XII D. I only E. II only 4. What is the frequency (per second, which is Hz) of electromagnetic radiation necessary to move an electron from n=2 to n=4 in a hydrogen atom? A. 2.18 x 10 -18 B. 5.4 x 10 -19 C. 6.2 x 10 14 D. 8.2 x 10
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Unformatted text preview: 14 E. 4.1 x 10-19 5. The density of gold is 19.3 g/cm 3 . How many grams of gold are in 1.0 qt of gold? (1 L = 1.056 qt) A. 18 B. 20.4 C. 1.8 x 10-2 D. 19.3 E. 1.8 x 10 4 6. Which particle has 48 electrons? A. 118 50 Sn 2+ B. 116 50 Sn 4+ C. 112 48 Cd 2+ D. 48 22 Ti E. 68 31 Ga 7. The series which correctly lists from left to right a halogen, an alkaline earth, a transition metal, and an alkali metal is A. F, Sr, Fe, Sn B. Br, Ba, Cr, Na C. Cl, K, V, Mg D. O, Ca, Ce, Al E. Cl, Na, Fe, Ca 8. Which one of the following forms of electromagnetic radiation has the shortest wavelength? (frequencies are given in parentheses in HZ or sec-1 ) A. radio waves ( 10 6 ) B. microwave ( 10 10 ) C. Xray ( 10 18 ) D. ultraviolet( 10 15 ) E. infrared ( 10 13 )...
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