CHEM 177 HOUR EXAM I SEPTEMBER 15, 2008
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1 PROF. THOMAS GREENBOWE PROF. THOMAS HOLME DR. KATHY BURKE THIS EXAM CONSISTS OF 22 QUESTIONS ON 7 PAGES CHEM 177 HOUR EXAM I SEPTEMBER 15, 2008 NAME RECIT. INSTR. RECIT. SECT. PARTS Problems 1-15, Pages 3, 4, 5 Page 5 Page 6 TOTAL GRADING POINTS 45 pts 28 pts 27 pts 100 pts SCORE NOTE: THE METHOD YOU USE IN SOLVING QUESTIONS MUST BE CLEARLY SHOWN IF YOU ARE TO RECEIVE FULL CREDIT. QUESTIONS ARE WRITTEN ON BOTH SIDES OF EACH PAGE. THE LAST PAGE CONTAINS USEFUL INFORMATION AND A PERIODIC TABLE. THIS SHOULD BE REMOVED AND USED FOR ADDITIONAL REFERENCE AND SCRATCH PAPER. DO NOT PUT ANSWERS ON THE TEAR AWAY PAGE. Teaching Assistants and Recitation Sections Name Stacey Althaus Neha Arora Jonathan Beasley Achala Bhuwalka Jakoah Brgoch Kurt Brorsen Divya Chaudhary Jacob Felder Stephen Fosdick Tanya Gupta Brett Hamilton Fanghao Hu Ricky Kienzler Ryang Kim Kyle Marchuk Matthew Meyer Matthew Moffitt Marilu Perez Brandon Peters Rajarshi Roychoudhury Erica Smith Thilina Weerasekera Ashley Yeager Sections 30, 38 14, 31 20, 35 39, 40 13, 19 3, 28 6, 37 8, , , , 33, 34 4, 23 2, , , 25 21, Time 2:00, 3:10 10:00, 3:10 1:10, 5:10 3:10, 5:10 9:00, 1:10 9:00, 12:10 11:00, 1:10 2:10, 4:10 10:00, 12:10 1:10, 3:10 2:10, 4:10, 5:10 10:00, 4:10 9:00, 11:00 11:00 4:10, 5:10 12:10, 9:00 2:10, 12:10 10:00 11:00 THE LAST DAY TO DROP CHEM 177 AND ADD CHEM 50 IS WEDNESDAY, SEPTEMBER 24, AT 5:00 P.M. SEE YOUR ADVISOR TO OBTAIN THE DROP/ADD FORM AND GO TO THE GENERAL CHEMISTRY OFFICE, ROOM 1608 GILMAN HALL.
2 2 Instructions for completing your computer scan sheet for Part I questions Please read the following instructions carefully before proceeding! Part I of your exam will be computer graded. In order for the computer to identify who you are, it is important that you complete the information section properly. You must use a #2 pencil and completely fill in the appropriate circles on the RED computer scan sheet. 1. To help you code the correct circles, first write your last name, first name and middle initial in the boxes (skip a space between each). Then darken the circles that match the letters in the box above it. See the sample to the right. 2. Write the middle nine digits of your ISU identification number in the boxes A-I. Do not skip any spaces. Below each number, darken the circle that matches this number. For example, See the sample at bottom right. 3. Write your recitation section number in the special code area, boxes K-L. Do not skip any spaces. For example, if you are in section 8 of Chem 177, write 08. Again, darken the circle that matches the number above it. See the sample at bottom far right. In Part I, select the one best answer for each question. Place your answer on the computer answer sheet by darkening the proper circle for that question. Your computer scan sheet will be your official answer sheet for Part I. All material (exam, answer sheet, scratch paper) must be returned to your TA in order for us to grade your exam.
3 PART I Multiple Choice. (15 questions at 3 pts each = 45 pts total) For questions 1-15, you will mark your answer choice on the computer scan sheet provided If matter is uniform throughout and cannot be separated into other substances by physical processes, but can be decomposed into other substances by chemical processes, it is called a (an). A) heterogeneous mixture D) compound B) element E) mixture of elements C) homogeneous mixture Use the following pictures to answer questions #2-#3. A B C D E Hydrogen peroxide, H 2 O 2, decomposes into water and oxygen gas. 2. Which picture accurately depicts the reactant(s) A) picture A B) picture B C) picture C D) picture D E) picture E 3. Which picture accurately depicts the product(s)? A) picture A B) picture B C) picture C D) picture D E) picture E 4. What is in the bubbles of a beaker of boiling water and how is it known? A) air, because water includes significant dissolved air in it B) air, because when air is warmed it rises, and thus the bubble rise C) hydrogen, because formation of bubbles indicates a chemical change D) hydrogen, because it is lighter than water, so the bubbles rise E) water, because boiling is an example of physical change 5. Osmium has a density of 22.6 g/cm 3. The mass of a block of osmium that measures 1.01 cm cm cm is g. A) 6.75! 10 "3 B) 3.45 C) 148 D) 6.75! 10 3 E) ( kg)( m) sec = kg m sec A) B) C) D) E) 1.1! 10 2
4 4 7. Which of the following elements is a metalloid? A) Be B) C C) Ge D) S E) In Use the following table to answer questions #8 and #9. 8. Isotopes of one another. A) I, II B) I, III C) I, IV D) II, III E) II, IV 9. One is the ion of the other. Protons Electrons neutrons I II III IV A) I, II B) I, III C) I, IV D) II, IV E) III, IV 10. A fictional element has two naturally occurring isotopes with the natural abundances shown here: Which statement is true for this element? ISOTOPE ABUNDANCE % % A) The atomic mass would be less than 18. B) The atomic mass would be closer to 18 than to 20. C) The atomic mass would be exactly 19. D) The atomic mass would be closer to 20 than to 18. E) The atomic mass would be greater than The formula weight of ammonium sulfate (NH 4 ) 2 SO 4, rounded to the nearest integer, is amu. A) 100 B) 118 C) 116 D) 132 E) 264 Use the following pictures to answer questions # Among the pictures A-D are representations of the following substances at 25 C: potassium, fluorine, and potassium fluoride. 12. Which picture corresponds to potassium? A B C D A) picture A B) picture B C) picture C D) picture D 13. Which picture corresponds to fluorine? A) picture A B) picture B C) picture C D) picture D 14. Which picture corresponds to potassium fluoride? A) picture A B) picture B C) picture C D) picture D
5 15. Which of the following is an illustration of the law of constant composition? A) Water boils at 100 C at 1 atm pressure. B) Water is 11% hydrogen and 89% oxygen by mass. C) Water can be separated into hydrogen gas and oxygen gas by an electrochemical process. D) When water boils, it goes from a liquid to a gas and it retains its formula, H 2 O. E) Water is a compound. You have completed the computer scan sheet section of the exam. Part II Balancing Equations (4 pts) These are the chemicals that combine when you strike an old-fashioned match. Balance the equation. KClO 3 + P 4 P 4 O 10 + KCl 17. (4 pts) Balance the equation for the combustion of the following molecule. C 4 H 8 O 2 + O 2 CO 2 + H 2 O Part III Naming and Writing Formulas for Compounds 18. (10 pts) Given the name, write the correct formula. PLEASE PRINT aluminum carbonate iron (III) cyanide diphosphorus pentoxide hydrobromic acid methanol (methyl alcohol) 19. (10 pts) Given the chemical formula, write the correct name for the compound. PLEASE PRINT. Ba(ClO 4 ) 2 CuF 2 (s) N 2 O 4 (g) H 3 PO 4 (aq) CH 3 CH 2 CH 3
6 Part IV Problems. Show all work. Answers should include appropriate units and contain the correct number of significant figures. Place final answer in the boxes provided for each question. 20. (9 pts) An unknown element is found to have three naturally occurring isotopes with atomic masses of amu (78.99%), amu (10.00%), and amu (11.01%). Which is the unknown element? 6 Answer Box 21. (8 pts) Titanium(IV) oxide nanoparticles have been touted for use in sunscreens (because they absorb UV radiation, but are not white on the skin). If a particular TiO 4 nanoparticle has a mass of g and is 59.9% titanium by mass, how many titanium atoms are in this nanoparticle? Answer Box 22. (10 pts) A Freon (CF 2 Cl 2 ) (MW = g/mole) leak in the air conditioning system for a vacuum pump releases molecules of Freon per second. At this rate, assuming it all leaks out, how long would it take to empty the Freon in an AC system holding m 3 of Freon? The density of Freon is kg/m 3. Answer Box
7 7 Useful Information: 1 amu = g Avogadro s Number = gallon = liters Periodic Table of the Elements 103 Lr (260) 102 No (259) 101 Md (258) 100 Fm (257) 99 Es (252) 98 Cf (251) 97 Bk (247) 96 Cm (247) 95 Am (243) 94 Pu (244) 93 Np (237) 92 U Pa Th Lu Yb Tm Er Ho Dy Tb Gd Eu Sm Pm (145) 60 Nd Pr Ce 140 8A 18 7A 17 6A 16 5A 15 4A 14 3A 13 Lanthanides Actinides 109 Mt (266) 108 Hs (265) 107 Bh (262) 106 Sg (263) 105 Db (262) 104 Rf (261) 89 Ac Ra Fr (223) 83 Bi Pb Tl Hg Au Pt Ir Os Re W Ta Hf La Ba Cs Sb Sn In Cd Ag Pd Rh Ru Tc (98) 42 Mo Nb Zr Y Sr Rb Rn (222) 85 At (210) 84 Po (209) 52 Te I Xe Kr Br Se As Ge Ga Zn Cu Ni Co Fe Mn Cr V Ti Sc Ca K Ar Cl S P Si Al He Ne F O N C B B 2B 12 1B B 7 6B 6 5B 5 4B 4 3B 3 12 Mg Na Be Li A 2 1A 1 1 H Ds (281)
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