Moorpark College Chemistry 11 Fall Instructor: Professor Gopal. Examination #1: Section One September 19, 2011.
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1 Moorpark ollege hemistry 11 Fall 2011 Instructor: Professor Gopal Examination #1: Section One September 19, 2011 Name: (print) Directions: Make sure your examination contains NINE total pages (including this cover sheet and the periodic table) when instructed to do so. Answer all the questions in the spaces provided. Be sure to show all your work for partial credit. Question (50 pts.) 26. (6 pts.) 27. (16 pts.) 28. (28 pts.) TOTAL (100 points) Points 1
2 hemistry 11 Fall 2011 Examination #1 For the first portion of this exam, select the best answer choice for the questions below and mark the answers on your scantron. Pay attention to significant figures. Then answer the free response questions that follow (100 pts. total; multiple choice 2 pts. each). 1. Determine the expected electronic configuration for Ac +3 (Z = 89) A. 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 4d 10 4p 6 5s 2 5d 10 5p 6 6s 2 6f 14 6d 10 6p 4 B. 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4p 6 5s 2 4d 10 5p 6 6s 2 4f 14 5d 10 6p 6. 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4p 6 5s 2 4d 10 5p 6 6s 2 4f 14 5d 10 6p 6 7s 1 D. 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 3d 10 4p 6 5s 2 4d 10 5p 6 6s 2 4f 14 5d 10 6p 5 E. 1s 2 2s 2 2p 6 3s 2 3p 6 4s 2 4d 10 4p 6 5s 2 5d 10 5p 6 6s 2 6f 14 6d 10 6p 6 2. List the following in order of increasing ionization energy: a, N, s, F, and K. A. F < N < a < K < s B. N < F < K < a < s. s < K < a < N < F D. s < a < K < F < N E. K < s < a < N < F 3. Now rank the species in #2 above in order of increasing electronegativity. A. F < N < a < K < s B. N < F < K < a < s. s < K < a < N < F D. s < a < K < F < N E. K < s < a < N < F 4. How many protons, neutrons, and electrons present in 186 W 3+? A. 183 protons; 186 neutrons; 74 electrons B. 183 protons; 74 neutrons; 186 electrons. 186 protons; 74 neutrons; 183 electrons D. 74 protons; 112 neutron; 77 electrons E. 74 protons; 112 neutrons; 71 electrons 5. What is the name of the following compound: u 2 S? A. copper sulfide B. copper(i) sulfide. copper(ii) sulfide D. copper(iv) sulfide E. dicopper monosulfide 2
3 6. The density of acetic acid is 1.05 g/ml. How many ml are contained in 327 g of acetic acid? A x 10-3 ml B x 10-3 ml x 10 2 ml D x 10 2 ml E x 10 2 ml 7. The temperature required to melt Nal is 528. What is this temperature converted to Fahrenheit and Kelvin? A. -44 F and 231 K B. -0 F and 255 K. 491 F and 528 K D. 982 F and 801 K E F and 977 K 8. Two electronic balances are tested using a standard weight. The true mass of the standard is g. The results of 5 individual measurements on each balance are recorded below: Balance A: g, g, g, g, and g; average = g Balance B: g, g, g, g, and g; average = g Which statement best describes the results? A. A: good precision, good accuracy. B: good precision, good accuracy. B. A: good precision, good accuracy. B: poor precision, poor accuracy.. A: poor precision, good accuracy. B: good precision, good accuracy. D. A: poor precision, poor accuracy. B: good precision, good accuracy. E. A: poor precision, poor accuracy. B: good precision, poor accuracy. 9. Which of the following is/are chemical properties of iodine? I. Iodine is a purple solid at 25. II. Iodine reacts with sodium metal to form sodium iodide. III. The density of iodine is 4.93 g/cm 3. A. I only B. II only. III only D. I and II E. I and III 3
4 For Questions 10-13, consider the structure of Fluoxetine (or Prozac) below, a drug approved for the treatment of major depression, obsessive-compulsive disorder, bulimia nervosa, panic disorder, and premenstrual dysphoric disorder: F 3 H H H O H H H H H H 2 H H H 2 H N H 3 Fluoxetine (Prozac) 10. Select A for True OR B for False regarding the following statement: Fluoxetine possesses resonance. 11. Select A for True OR B for False regarding the following statement: Fluoxetine is considered an overall nonpolar molecule. 12. What is the molecular geometry around the oxygen atom? A. linear B. trigonal planar. bent D. trigonal pyramidal E. tetrahedral 13. Determine the approximate bond angle around the H-N- bond? A. 90 B D. 180 E. annot be approximated 4
5 14. If the fuel efficiency of an automobile is 27 miles per gallon, what is its fuel efficiency in kilometers per liter? (1 km = mile, L = quarts, 4 quarts = 1 gallon) A. 11 km/l B. 14 km/l. 17 km/l D. 63 km/l E. 180 km/l 15. Which of the species below has the smallest radii? A. Mg B. Mg +. Mg 2+ D. Mg - E. Mg If 46.0 g of ethanol, H 3 H 2 OH, at 22.0 absorbs 1.45 kj of heat, what is the final temperature of the ethanol? The specific heat of ethanol is 2.44 J/g. A. 9.1 B D E How many lone pair set of electrons, if any, surround the central atom in SO 2? A. 0 B D. 3 E Which statement concerning solid Nal (i.e., table salt) is expected to be TRUE? A. Nal is a chemical compound. B. Nal is a homogeneous mixture.. Nal is a heterogeneous mixture. D. Nal has properties identical to its component elements, sodium metal and chorine gas. E. Both A and B 5
6 19. Determine the correct answer to the following expression: 2.97 x x 10-3 A. 6.1 x 10-3 B x x 10-3 D x 10-3 E x 10-3 For Questions 20-25, match the vocabulary terms to their respective definitions/descriptions. A. sublimation B. atomic number B. deposition D. atomic mass. condensation DE. heat D. pure substance AB. metal E. element BD. nonmetal AB. mass number DE. metalloid 20. malleable, ductile, oxidizes, poor conductor of heat and electricity, and low melting point 21. energy that flows into or out of a system because of a difference in temperature between the system and its surrounding 22. a specific substance which cannot be decomposed into simpler substances by ordinary chemical means 23. conversion of matter from a gas into a solid with bypassing the liquid phase 24. the number of protons and neutrons in the nucleus of an atom 25. the number of protons in the nucleus of an atom END OF MULTIPLE HOIE 26. (6 pts.) Your physician orders 125 mg of medication per hour. The label on the IV bag reads 5 g/1000 ml. The set delivers 15 gtts/ml, where the unit "gtts" stands for drops of liquid. How many ml should infuse each hour? The current flow rate is 10 gtts/min. Is this correct? If not, what is the correct flow rate? 6
7 27. (16 pts. total; 2 pts. each) Write the name/chemical formula for each of the following listed below: A. chromium(iii) sulfite B. aluminum phosphate. PF 5 D. Ag 2 O 3 E. strontium hydroxide F. ammonium acetate G. zinc nitrate H. N 2 O (Exam ontinued on Next Page) 7
8 28. (28 pts. total) onsider each of the following ions/molecules shown below and write your final structures in the boxes provided: A. Beginning with the best Lewis dot structure, use VSEPR theory to draw each of the listed species, including resonance where appropriate. Don t forget to include lone pairs! B. Describe the geometry about EAH central atom. Include both electronic and molecular geometries.. Give the approximate bond angle(s) around each central atom. D. Determine whether the overall species is ionic, polar, and/or nonpolar. i. (14 pts.) NH 2 H 2 OOH, glycine ii. (7 pts.) lo - 3, chlorate iii. (7 pts.) HO - 2, formate Structure #1 electronic geometries: molecular geometries: approx. bond angles: polar or nonpolar? Structure #2 electronic geometry: molecular geometry: approx. bond angle: polar or nonpolar? Structure #3 electronic geometry: molecular geometry: approx. bond angle: polar or nonpolar? 8
2. List the following in order of increasing ionization energy: Ca, N, Cs, F, and K.
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