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C111PF07T1 - CHEMISTRY 1 l 1 FIRST EXAM:1 I 1WO4‘1‘ l...

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Unformatted text preview: CHEMISTRY 1 l 1 FIRST EXAM SEPTEMBER 21, 2007 (:1 I 1WO4‘1‘ l BUBBLE IN YOUR NAME AND 1]) NUMBER ON THE SCANTRON SPEET FOR PROPER IDENTIFICATION. THERE IS ON LY ONE BEST ANSWER FOR EACH QUESTION. YOUR PERIODIC CHART CONTAINS MUCH USEFUL INFORMATION NEEDED FOR SONIE QUESTIONS. *** GOOD LUCK *"‘* 1. The average farm in the United States occupies an area of 435 acres. What is this in square miles? (some useful conversion factors are: 1 acre = 43,560 ft2 and 1 mile = 5280 it) (1) 3590 (2) 0.680 (3) 5.28X 10“ (4) 1.562(10”3 (5) 1.29x10“" 2. The density of titanium is 4,51 g cm". What is the volume of 1590 g of titanium in cubic meters? (1) 71.7 (2) 3.53 X 10" (3) 3.53 (4) 3.53 x10“ (5) 7.1? x10? 3. Which of the numbers below is greater than 0.000082? (1 ) 1.2 X 10-5 (2) 7.3 x 10“ (3) 1.0 x 10" (4) 9.8 x 10‘“5 (5) none ofthese 4. One atom of an element weighs 5.14 X 10‘23 g. What is the element? (1) vanadium (2).}potassium (3) nitrogen (4) lead (5) phosphorous 5. How many moles of sulfilr atoms are contained in 64g of $3? (1) 2.0 (2) 1.0 (3) 0.50 (4) 0.25 (5) 0.125 (1) gram (2) liter (3) °C (4) kilometer (5) kilogram 7. What is the mans in grams of one molecule of ethane, C-ZHG? _ (1)1.7r 2:104“ (2) 3.0 21:10~24 (3) 30 (4) 5.6 x10445 (5) 5 11:10—23 3. Which contains the largest number of carbon atoms? (1) 0.10 mol of carbon atoms (2) 1.2 g carbon (3) 0.10 mol of CH4 (4) 1.6 g of CH4 (5) all are the same 9. Carbon dioxide is a product of hydrocarbon combustion, (30;. How many molecules of C0; are present in 0.022 g of carbon dioxide? (1) 3.0'x102“ (2) 6.02 x1023 (3) 1.0 (4) 0.022 (5) none of these, because carbon dioxide is not a molecule 10. How many moles of oxygen atoms are present in the 0.022 g of carbon dioxide from the problem above? (1) 5.02410“1 (2)1.0X10'3 (3) 1.5 1:104 (4) 2.0 (5) 32 11. A cigarette lighter contains the substance butane (Cer) with the following preperties. A. the lighter contains 4 g of butane B. the density of the butane is 0.57 g cm?3 C. the freezing point of the butane is 438°C D. the butane will burn in air Which of the properties described is a chemical property of butane? (I) A (2) B,C & D (3) C & D -.(4) D (5) all ofthese 12. Which of the pr0perties of butane described above are intensive properties of butane? (1)A (2) B,C&D (3) C&D (4) D __(5) B&C 13. The number 50 in the isotope designated 50Ti is known as the __?_. ( l) the atomic number (2) the atomic mass (3) the number of neutrons (4) the atomic mass number (5) the total number of electrons 14. 15. I6. —— PAGE. 2 — A compound was analyzed and found to contain 21.7% carbon, 9.6% oxygen and 68.7% fluorine by mass. What is the empirical formula of this compound? (I) gory5 (2) cuolorfig (3) C30Fe2 (4) C5021:12 _ (5) cor4 Cyclopropane is a compound of carbon and hydrogen that is used as a general anesthetic. When 1.00 g of cyclopropane was burned in an excess of oxygen, 3.14 g of C02 and 1.29 g of H20 were produced. What is the empirical formula of cycloprdpane? (1) CH (2) CH2 (3) CH203 (4) C3Hs (5) none of these is correct Which element is most electronegative? (1) hydrogen (2) arsenic (3) selenium . (4) bromine (5) all are approximately the same 1?. l8. 19. 20. 21. 22. 23. 24. 25. 26. Bromine consists of two isotopes in our environment, ”Br with an atomic mass of 78.918 and InBr with an atomic mass of 80.916. What is the percentage of the ”Br isotope in naturally occurring bromine? (l) 47% (2) 49.35% (3) 50.65% (4) 79.9% (5) more information is needed Which contains the largest number of electrons? (1) Fe (2) Fe“ (3) Ar (4) s (5) F The element with only one valence electron that is also classified as a non~metal is H? ( l) lithium (2) sodium (3) helium (4) hydrogen (5) there are not any non-metals with one valence electron The first three most abundant elements in our earthly environment are members of the metal,_ non-metal and metalloid classes of elements. The metalloid member of these three is #7.... and is _7_ (first, second or third) most abundant. l ' - . ' ' - (1) oxygen, first (2) ’hydrogen, first (3) silicon, second (4) silicon, third (5) aluminum, third i - i | The elements collectively kiaown as the alkaline earth elements have _?_ valence electrons. (l) I (2) 2 (3) (4) 6 (5) variable Which is not a representative (main group) element? (1) phosphorous (2) potassium ,_ (3) rubidium (4) argon (5) manganese The compound that would form from the chemical combination of aluminum and sulfur would be expected to have the chemical formula _? (1) ans (2) ms2 (3)1123 (4) ans, (5) none oftheseiscorrect class of compounds known as _? (1) organic compounds ' (2) covalent compounds (3) hydrocarbons (4) isotopes (S) salts An element that is a good conductor of both heat and electricity and has a low electronegativity would be classified as a(an) H? (l) metalloid |(2) metal (3) non-metal (4) chalcogen (5) noble gas The element gallium has ? valence elelctrons. (I) 3 (2) 4 (3) 5 (4) .6 (5) an undefined number of we, 9‘. 1. \ w—PAGE 3 —— ‘H-v 2'2". Which of the Lewis structures below is correct for 1-1202? (1) H‘O: (2) ME: {3)H‘i3" (4)H::. . 'I .:: " .0.” :: .: I I I I. u : :H In as” o” (5) none of these is correct 28. Which of the molecules below would have a double bond between atoms? (1) H2 (2) F2 (3) 02 (4) N2 (5) HF 29. Which pair of elements could combine to form a molecule with the Lewis structure shown below? (1) Na,& c1 (2) H& He (3) H&F (4) "0&3 o ...— 5 C620 oAz': B: U 30. One of the elements in our periodic chart was first discovered as a component of our sun rather than on earth. It is the socond mest abundant element in our sun and was named after the Greek god of the sun, Helios. That element is ? (1) helium (Iii—vanadium (3) platinum (4) water (5) iron TURN 1N YOUR SCANTRON SHEETS. KEEP YOUR EXAM PAPERS. A KEY TO THE EXAMINATION WILL BE POSTED IMMEDIATELY AFTER THE EXAM. “Exam #1” Key Sept. 21 2007 1. 2 6. S 11.4 16.4 21.2 26.1 2. 4 I 5 . 12. 2 17. 3 22. S 27. 2 3. 3 8. S 13.4 18. 1 2‘3. 4 28. 3 4. 5 9. 1 14. 1 l9. 4 24. 5 29. 5 5. 1 l0. 2 15.2 20. 3 25. 2 30. 1 ...
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