[Bush] Chemistry Exam #1 - Fall 2006

[Bush] Chemistry Exam #1 - Fall 2006 - Chemistry 1301 Fall...

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Unformatted text preview: Chemistry 1301 Fall 2006 Exam #1 PLEASE READ THESE INSTRUCTIONS CAREFULLY BEFORE BEGINNING THIS EXAMINATION. Select the best response to each question. There is only one best response to each question unless otherwise indicated in the question. There are 30 questions in the first part of this examination worth 3.0 points each. The remaining 10 questions on the symbols and names of the elements are worth 1.0 point each. (Total of 100 points.) Check your test booklet to be sure that you have a complete exam with all 40 questions. Write your NAME and TEST NUMBER on your Scantron. Write your name on the first page of the test booklet also. Work each problem carefully on the test booklet or on the scratch paper provided. Then select the answer, which you feel is the best response. If none of the choices is close to your calculated answer, or if none is correct, then select the response "none of the above." ALL ANSWERS MUST APPEAR ON THE SCANTRON. Your grade will be determined only by what appears on the Scantron, not by work on the test booklet. Look over your exam and work the easiest problems first, saving the more difficult ones for last. Be sure that you have correctly indicated your final choices on the Scantron before turning in your paper. If a question is incorrectly marked on the Scantron, it will be counted wrong even if it was correctly marked on the test booklet. If you have any questions about any of the problems on this exam, it is your responsibility to ask for a clarification from the instructor during the examination. 1. Which one of the following best represents a chemical change? a) Pure water is obtained from seawater by boiling the seawater and condensing the steam in a separate container. b) Pure water is obtained from a mixture of sand and water by passing the mixture through a piece of finely woven cloth to remove the sand. <:) Pure water is obtained by mixing hydrogen gas and oxygen gas and igniting the mixture. d) Pure water is obtained by partially freezing tap water, removing the ice, which is formed, and allowing the ice to melt in a separate container. e) None of the above is a chemical change. 2. Which one of the following is an intensive property? 2 t a) VOlUIne dmrci @ density = WV g/mL, amcord % «HIM. gamer? c) mass QYCLLULA d) length “\M e) none of the above is intensive 3. How many significant figures are there in the sum of (15.02 + 9,986.0 + 3.518). 6 si nificant fi ures ’5' O .9 . . .9 czqu b) 5 Significant figures 5‘ 95 c) 4 significant figures «3004. 38 (9 SF L 4. A student measures out 24 mL of water and determines the mass d) 3 significant figures e) none of the above is correct of this water to be 25.624 grams. What should he report as the density of his water sample using the correct number of significant figures? a) 1.0677 g/mL 01-.- mfi : 254020—93 : hgo‘tbb‘“ b) 1.068 g/mL \10\ 24mL. c) 1.07 g/mL 77 2 3‘: G1) 1.1 g/mL 7-5" wwnéOD e) 1 g/mL \,\ 5. The unit furlong is used in horseracing. There are exactly 8 furlongs in one mile. What is the length of l furlong. expressed in meters? (1.000 mile = 5280 ft; 12 inches = 1 ft; 1.00 inch = 2.54 cm; 100 cm = 1 m.) Express your final answer to_3__significant figures. a) 2.17 x 103 meters b) 1.29 x 104 meters . _ I © 2 .92.? We e.in r223 32:» ..'n\ 2.01 x 10 meters .5.”- fi “m “a “Do” (039m (:1) 1.61 x 103 meters h n I e) none of the above ‘90 : 3.01M!) rode/LA 6. Perform the following calculation. How many significant 3 f' e e there 'n the final answer? igur 5 ar 1 ‘2 2 h +<352. I g1.302 x 103) + 952.7 - 2264.7 (1.570 x 102) — 122.2 = 4 S; a) 1 significant figure b) 2 significant figures @ 3 significant figures d) 4 significant figures e) none of the above is correct 7. An atom and ion of the same isotope differ only in their a) atomic number b) atomic mass number c) number of protons d) number of neutrons number of electrons 8. Naturally occurring neon consists of the two isotopes neon—20 and neone22. The atomic mass for neon is approximately 20.2. What are reasonable estimates of the relative percentages of _ _ ' 7 , neon 20 and neon 22 respectively. m{@ 20 h we'zz 3X10% neon—20, 90% neon—22 9) 20% neon—20, 80% neon—22 16> ‘29, 57f 50% neon—20, 50% neon—22 .239— :L9 , d) 80% neon—20, 20% neon—22 ‘9 "‘“Q‘A " 070:1 90% neon—20, 10% neon—22 9. A 0.100—g sample of magnesium metal completely reacts with an excess of oxygen to form 0.166 grams of magnesium oxide. A second magnesium sample with a mass of 0.268 g completely reacts with an excess of oxygen. What mass of magnesium oxide do we expect to form from this second sample? a) 1.61 grams magnesium oxide . o_‘be 00;: b) 0.102 grams magnesium oxide “ c) 2.25 grams magnesium oxide d) 0.619 grams magnesium oxide é§>none of the above 10. If 1.00 grams of pure magnesium metal reacts completely 4 with oxygen (2.00 grams initially present) and 1.66 grams of magnesium oxide is produced, how much oxygen reacted with the magnesium metal? a) 2.00 b) 1.00 11. of grama of of of grams grams grams oxygen oxygen oxygen oxygen of the above the following? ad 19 protons, /b7 18 protons, (j) 19 protons, fifl 19 protons, e) none 40 21 21 40 of the ab How many protons, neutrons, reacted __ , FA reacted ' w 5 c1 reacted O “0% 53 re acted C(fimwm" “Wigs Pi rm...“ ‘ and electrons are there in one of 45 -fl: SN WVWD 4o "K1+ ’ 1 9% {3" 01m“) mix-1M3 neutrons, 20 elect ns HA7 “6 a neutrons, 19 electrzns\\\\\ neutrons, l8 electrons €§¢xk \*6r neutrons, 18 electrons ove 12. The empirical formula of a compound always shows: the elements present and the simplest whole number ratio of atoms. in onamolecule of the substance. 13. none of the above the molecular mass of the substance the elements present and the actual number of atoms combined the number of molecules present in a sample of the Substance A compound consisting only of the two elements carbon and oxygen. If a pure sample of this compound contains 12.011 grams of carbon and 15.9994 grams of oxygen, what is the percentno by mass? a) 27.29% .Q} 42.88% @57.12% d) 72.71% oxygen oxygen oxygen oxygen e) none of the above 12¢?LL (no: I + 6.9994) 6.99014 \ 02.9: sMSs‘W?) Express your answer to 4 significant figures. x100: 42538390 Cl 0 x500 ; S’Ml/o O ow» 14. To illustrate the Law of Multiple Proportions, we could 5 use data giving: a) the percent 63Cu and 65Cu isotopes present in naturally occurring Cu metal b) the Cu present in CuO prepared by two different methods in the laboratory C) the Cu present in two different mixtures of CuClz and CuBrZ d) the Cu present in CuO and CuClZ the Cu present in CuO and Cu20 15. To illustrate the Law of Definite Composition, we could use data giving: a) the percent 63Cu and 65Cu isotopes present in naturally occurring Cu metal (E) the Cu present in CuO prepared by two different methods in the laboratory c) the Cu present in two different mixtures of CuC12 and CuBr2 d) the Cu present in CuO and CuC12 e) the Cu presentlin CuO and Cu20 16. A summary of experimental data, often expressed mathematically, is called a) an hypothesis. (:) a law. c) a theory. d) a prediction. e) a datum. 17. The accuracy of a data set is considered to be poor, if a) the data vary widely from the average value. b) the data are a set of closely spaced numbers. 0) the average of the data is close to the actual value. <:) the average of the data is far from the actual value. e) the precision of the data is poor. 18. What would be the volume, in mL, of 1000. g of ethanol if 6 the density of ethanol is 0.789 g/mL? @ 1.27 x 103 b) 789 :rnL' 3 c) 7 89 x 103 W (1000.8): c.27wo ml. . d) 0.789 e) 1.27 19. The ratio of the atomic mass of element A to that of B is 0.432. If the mass of A is 42.31 amu what is the mass of B? a) 18.3 amu P) 42‘ amu 413‘ amgA<hOm “(LB E.- 97'q cimug ’c) 97.9 amu d) 105 amu e) none of these 20. Whose name is associated with the invention of the periodic table? a) Antoine Lavoisier b) John Dalton @ Dmitri Mende leev d) Albert Einstein e) Joseph Proust 21. Whose name is most closely associated with an early statement of atomic theory? a) Antoine Lavoisier (E) John Dalton c) Dmitri Mendeleev d) Albert Einstein e) Joseph Proust 22. ngch of the following is a metal? Na b) C c) Ne d) 0 e) Se 23. Which of the following is a metalloid? 7 a) S b) Ga c) Sn d) In @Sb 24. Which of the following is a nonmetal? a) Ca r on 0) Fe d) Sb e) Ce 25. Which one of the following compounds is molecular? a) FeZO3 b) NaOH @ Na d) CuCl2 e) CdS 26. Which one of the following is a binary ionic compound? a) CC].4 b) co c) NO e) N204 27. In the periodic table, elements are arranged in a) alphabetical order b) order of increasing atomic mass <:) order of increasing atomic number d) order of increasing neutron count e) something else 29. 30. b) Cs, Ba 0) V, Fe d) Ga, Ge e) C, O The atomic masses in the periodic table are not whole numbers because we can't measure the masses closely enough to express the a) results as whole numbers b) atoms gain and lose electrons easily, thus changing the mass significantly c) real samples are always contaminated with other elements d) atoms of the same element have different numbers of protons the masses are weighted averages of the naturally occurring isotopes In the periodic table, which group contains only nonmetals? Use the American A, B lettering system on the periodic table provided. a) 3A b) 6A c) 2B d) 4A 8A Each one of the following ten questions counts 1.0 point. 31. Which one of the following names is incorrectly paired with its symbol? (:3 palladium Pa b) antimony = Sb c) sodium = Na d) rhenium = Re e) all of the above are correctly paired 32. 33. 34. 35. 9 Which one of the following names is incorrectly paired with its symbol? a) gallium = Ga C) selenium = Sn c) platinum = Pt d) germanium = Ge e) all of the above are correctly paired Which one of the following names is incorrectly paired with its symbol? a) bismuth = Bi b) lead = Pb c) mercury = Hg d) barium = Ba (:) all of the above are correctly paired Which one of the following names is incorrectly paired with its symbol? a) vanadium = V b) cesium = Cs c) scandium = Sc <:) tungsten = Ta e) all of the above are correctly paired. Which one of the following names is incorrectly paired with its symbol? a) osmium = Os b) silver = Ag manganese = Mn thallium = Ta C) 9) all of the above are correctly paired. 36. 37. 38. 39. 40. ® 10 Which one of the following names is incorrectly paired with its symbol? a) lithium = Li b) argon = Ar 0) iodine = I d) thorium = Th all of the above are correctly paired. Which one of the following names is incorrectly paired with its symbol? a) chromium = Cr b) fluorine = F C) radon = Ra d) iron = Fe e) all of the above are correctly paired Which one of the following names is incorrectly paired with its symbol? rubidium = Ru b) cobalt = Co 0) beryllium = Be d) strontium = Sr e) all of the above are correctly paired Which one of the following names is incorrectly paired with its symbol? a) bromine = Br b) chlorine = Cl c) zirconium = Zr (:) cadmium = Ca e) all of the above are correctly paired Which one of the following names is incorrectly paired with its symbol? a) potassium = K b) gallium = Ga 0) plutonium = Pu technetium = Te e) all of the above are correctly paired ...
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[Bush] Chemistry Exam #1 - Fall 2006 - Chemistry 1301 Fall...

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