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114年 - B4 Lesson 02：Boat Schools: Making Waves in Education_文法選擇#128822
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1. Equimolar amounts of the gases N2 and H2 are mixed in a closed container fitted with a piston (allowing the volume of the container to change, thus keeping the pressure constant). Calculate the ratio of the final volume of the container to the initial volume of the container when the reaction N2 + 3H2 → 2NH3 goes to completion. (A)2/3 (B)3/2 (C)1 (D)1/3 (E)none of these
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2. The wavelength of light associated with the n = 2 to n = 1 electron transition in the hydrogen spectrum is 1.216 × m. By what coefficient should this wavelength be multiplied to obtain the wavelength associated with the same electron transition in the ion? (A)1/3 (B)3 (C)1/4 (D)9 (E)1/9
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3. How many of the following 0.10 M solutions (CaBr2, KNO2, NH4C1O4, NH4NO2, NH4CN) are acidic? (A)3 (B)2 (C)1 (D)4 (E)5
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4. Samples of the gases H2 and SO2 have equal masses and are at the same temperature and volume. Calculate the ratio of rates of impact with the walls (H2: SO2). (A)1 (B)6 (C)32 (D)90 (E)180
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5. Sodium oxide (Na2O) crystallizes in a structure in which the ions are in a face-centered cubic lattice and the Nat ions are in tetrahedral holes. What is the number of ions in the unit cell? (A)2 (B)4 (C)6 (D)8 (E)none of these
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