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AP'94MultipleChoice - 1994 Advanced Placement Chemistry...

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1994 Advanced Placement Chemistry Exam Part I: Multiple Choice Note: For all questions involving solutions and/or chemical equations, assume that the system is in pure water and at room temperature unless otherwise stated. Directions: Each set of lettered choices below refers to the numbered questions or statements immediately following it. Select the one lettered choice that best answers each question or best fits each statement and then fill in the corresponding oval on the answer sheet. A choice may be used once, more than once, or not at all in each set. Questions 1–4 (A) Heisenberg uncertainty principle (B) Pauli exclusion principle (C) Hund’s rule (principle of maximum multiplicity) (D) Shielding effect (E) Wave nature of matter 1. Can be used to predict that a gaseous carbon atom in its ground state is paramagnetic 2. Explains the experimental phenomenon of electron diffraction 3. Indicates that an atomic orbital can hold no more than two electrons 4. Predicts that it is impossible to determine simultaneously the exact position and the exact velocity of an electron Questions 5–7 refer to the phase diagram below of a pure substance. (A) Sublimation (B) Condensation (C) Solvation (D) Fusion (E) Freezing 5. If the temperature increases from 10_C to 60_C at a constant pressure of 0.4 atmosphere, which of the processes occurs? 6. If the temperature decreases from 110_C to 40_C at a constant pressure of 1.1 atmospheres, which of the processes occurs? 7. If the pressure Increases from 0.5 to 1.5 atmospheres at a constant temperature of 50_C, which of the processes occurs? Questions 8–10 refer to the following diatomic species. 8. Has the largest bond–dissociation energy 9. Has a bond order of 2 10. Contains 1 sigma (s) and 2 pi (_) bonds Questions 11–13 11. Utilized as a coating to protect Fe from corrosion 12. Is added to silicon to enhance its properties as a semiconductor 13. Utilized as a shield from sources of radiation Copyright © 1994 by Educational Testing Service, Princeton, NJ 08541. All rights reserved. Reproductions of these examination questions by classroom teachers is permitted for face-to-face teaching purposes only. 1
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Directions: Each of the questions or incomplete statements below is followed by five suggested answers or completions Select the one that is best in each case and then fill in the corresponding oval on the answer sheet. 14. Which of the following is lower for a 1.0–molar aqueous solution of any solute than it is for pure water?
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