Practice_Exam_3-1

Practice_Exam_3-1 - Chemistry C105 Practice Exam 3 This...

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Chemistry C105 Practice Exam 3 This practice test should be used as a tool to assess your level of preparedness for the actual test. It is not intended to be the only means of studying for the exam. The actual exam will have 60 questions. 2. The H atom transition n = 5 to n = 1 is more energetic than A. n = 3 to n = 1 B. n = 4 to n = 3 C. n = 5 to n = 4 D. all of these 3. If the de Broglie wavelength of an electron is 2.00 x 10 -6 m, What is the velocity of the electron? (m e = 9.11 x 10 -31 kg) A. .260 m/s B. 1022 m/s C. 6.77 x 10 4 m/s D. 364 m/s E. 3.31 x 10 -28 m/s 4. What is the velocity of the electron with a de Broglie wavelength of 1.00 m? (m e = 9.11 x 10 -31 kg) A. 7.28 x 10 -4 m/s B. 8.44 x 10 -2 m/s C. 3.00 x 10 8 m/s D. 9.00 x 10 16 m/s E. 5.20 x 10 18 m/s 5. Which neutral element below has a valence shell electron configuration 4s 2 4p 4 ? A. S B. Se C. Sb D. As E. Br 1. Which one of the following electron transitions in a hydrogen atom results in the greatest release of energy from the atom? A. n = 3 to n = 1 B. n = 1 to n = 2 C. n = 2 to n = 1 D. n = 4 to n = 1 E. n = 6 to n = 5
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6. Which group is represented by the valence electron configuration ns 2 np 4 ? A. chalcogens B. noble gases C. halogens D. alkali metals E. alkali earth metals 7. What is the electron configuration of Ne? A. 1s 2 2s 2 2p 6 B. [He]2p 6 C. 1s 2 2p 6 D. 2s 2 2p 6 E. 2p 6 8. Which of the following configuration represents an excited state configuration? A. 1s 2 2s 2 B. 1s 2 2p 6 C. 1s 2 2s 2 2p 4 D. 1s 2 2s 2 2p 1 9. The ground state electron configuration for Sn 4+ is A. [Kr] B. [Kr] 4d 10 C. [Kr] 4d 10 5s 2 D. [Kr] 4d 10 5s 2 5p 6 E. [Xe] 10. The electron configuration 1s 2 2s 2 2p 6 3s 2 3p 6 could correspond to which of the following? A. O 2- B. N 3- C. K + D. all of the above (A, B, C) 11. The Photoelectric effect demonstrated that A. electron energy is proportional to velocity. B. light energy is proportional to frequency. C. energy of a photon is proportional to light intensity. D. both A and B are true. E. both B and C are true.
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12. Which of the following forms of electromagnetic radiation has the shortest wavelength? A. ultraviolet B. x-ray C. microwave D. infrared 13. The energy of light A. is proportional to frequency. B. is proportional to wavelength. C. is inversely proportional to wavelength. D. follows both A and C above. 14. Given the radiation: microwave Gamma-rays infrared ultraviolet x-rays I II III IV V What is the ordering for increasing energy? A. I < IV < III < II < V B. I < IV < III < V < II C. III < I < IV < V < II D. I < III < IV < V < II E. II < III < IV < V < I 15. Arrange in order of increasing frequency: A. red light < violet light < infrared light B. violet light < red light < infrared light C. infrared light < red light < violet light D. infrared light < violet light < red light 16. If the wavelength of yellow light is 570 nm, what is its frequency? A. 171 Hz
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Practice_Exam_3-1 - Chemistry C105 Practice Exam 3 This...

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