Exam 1 Worked Key

Exam 1 Worked Key - Chemistry 1341 ‘ FaH,2009 EXAM 1 Test...

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Unformatted text preview: Chemistry 1341 ‘ FaH,2009 EXAM 1 Test Form 01 Name: Date: 29 September 2009 ’5 EXAM GUIDELINES: 1 Closed book, closed notes. 2. Once the exam begins. you may not share or borrow anything from anybody else. 3. The instructor and the proctors reserve the right to move any student at any time. 4 This exam has 38 multiple-choice questions (2.74 points each for a total of 104 5. points). All questions must be answered on the scantron sheet but you are advised to show all work and indicate your answer choice on the exam as well. The scantron should have your name and the version of the exam (01, 02, 03) clearly marked in the TEST FORM box on the scantron. The scantron must be completed. prior to the end of the test. Chemistry 1341 Exam 1 Name MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. 1) - 1) An atom of the most common isotope of gold, 197Au, has protons, neutrons, and e ectrons. a A) 118, 79, 39 __:- M Q"; HEWIC‘fl—E ’?7"‘ B) 79, 197, 197 79,118,118 cfgwg‘: ;"9R\ NJ 7ye' ) _ 79,118,79 , . _ , . 19779118 5’79“ “:1” WM (CH- [3+ ._ 59 ’?7 NE? ’79 2) 1 kilogram = m1111grams _ / . . A)10,000 B) 1000 I 1 :n: 10—6 @) ,000,000 ) none of the above 3) How many molecules of CH4 are in 48.2 g of this compound? A) 3.00 B 2.90 x 1025 1.81 x 1024 D) 4.00 E) 5.00 x 1024 3:3 ' . I -- -_ 4) The name of PC13 is . 4) C A) trichloro potassium In no or us richloride so @plfiospfiiiiikiricilortide i H i f o “cg phosphorousflli) chloride E) Potassium chloride f K K B-l 7) The correct name for N205 is A) nitrogen pentoxide B) nitric oxide _ __ itrogen oxide D) Mo(C102)4 E) Mo(ClO4)4 9) There are significant figures in the answer to the following computation: (29.2 — 20.0) (1.79 >< 105) 10) An element cannot . 10) A) be a pure substance B) be part of a heterogeneous mixture _ be part of a homogeneous mixture be separated into other substances by chemical means ) interact with other elements to form compounds 11) old foil experiment performed in Rutherford's lab to the discovery of the atomic nucleus ' tilized the deflection of beta particles by gold foil C) confirmed the plum—pudding model of the atom D) proved the law of multiple proportions E) was the basis for Thomson‘s model of the atom 12) When the following equation is balanced, the coefficient of H28 is . 12) a FeC13(aq) (g) a F6253 (s) 6H0 (3CD A) 1 B) 5 D) 2 E) 4 13) _ and reside in the atomic nucleus. 13) i- rotons, neutrons ' Protons; electrons C) Electrons, neutrons D) none of the above E) Neutrons, only neutrons 14) Which formula/name pair is incorrect? 14) A) Fe2(803)3 iron(lll) sulfite s) FeSO4 iron(II) sulfate 59/ I I e2(SO4)3 ironflll) su _ «ode N i Fe803 iron(ll) sulfite _. I E) F65 iron(ll) sulfide 15) Which Species has 54 electrons? 132 Xe2+ B) Xe+ A )54 B-3 17) The formula weight of silver chromate (AngrO4) is amu. 17) C A)223.87 B) 339.86 D) 159.87 E) 175.87 a G 9 7 .89) + 51396 + 6 4/; 0 0 18) When the following equation is balanced, the coefficient of H2 is K(s) + H20 (1) —* KOH (aq) + H2 (g) A)2 D)5 E)4 21) Chromium and chlorine form an ionic compound whose formula is Cr C13. The name of this 21) compound is A) monochromium trichloride '0 [I m5? B) chromium chlorine C) chromic trichloride Chromium<flmfich10fide C k or M MM 7;? '_ hromium(III) chloride 22) The form aluminum hydroxide is D) A12 (OH)3 fie—"Fir"? "1"""'-". W“! E) AlOI-I 23) 23) Precision refers to close a measured number is to zero 29?” ow close a measured number is to other measured numbers C how close a measured number is to the true value D) how close a measured number is to infinity E) how close a measured number is to the calculated value 24) What is the mass % of carbon in dimethY1.§(C2H680) rounded to three significant figures? 24) A) 79.8 B) 60.0 25) What is the correct formula for ammonium sulfide? A) NH4503 1- D) (NH4)2 504 E) NH 38 26) Which of the following are chemical processes? 1. rusting of a nail V/ l 2. freezing of water H g 3. decomposition of water into hydrogen and oxygen gases 4. compression of oxygen gas A) 1,4 B) 1.2 C) 1,3,4 D) 2,3,4 27) Express the temperature, 422.35 K, in degrees Celsius. A) 695.50‘3‘C B) 792.23'3C C) 22.78”C 0.89 “C fi'%_ 5 _ B—5 28) An empirical formula always indicates . 28) A) the isotOpe of each element in a compound __ .-.~ w many of each atom are in a molecule e simplest whole—number ratio of different atoms in a compound the geometry of a molecule E) which atoms are attached to which in a molecule 29) The combustion of ammonia in the presence of excess oxygen yields N02 and H20: 29) 4 NH3 (3) + 7 02 (s) ~3- 4 N02 (3) + 6 H20 (3) g of oxygen. The combustion of 2 .. .. A) 15.3 ' 30) Which pair of elements would you expect to exhibit the greatest similarity in their physical and 30) chemical properties? A) Si, P B) C, N C) H, He D) K, Ca f typically form ions with a 2+ charge. . I lkaline earth metals E ) Halogens - C) Chalcogens D) Transition metals E) Alkali metals 32) Which one of the following is often easily separated into its components by simple techniques such 32) I. as filtering? " A) solutions B) homogeneous mixture _£_ounds .;' "I ' ' mymmamsswmwmfi' -' hetero eneous . - "3‘fit3f.'fa.r'-1'Fifi3fi§fl= iii-“fish ' ' ' ' " ements B—6 33) Consider the following selected postulates of Dalton‘s atomic theory: _ Each element is composed of airbtre e1 small particles F 7? H E Atoms are indivisible. Q41 @ f N5 )NQ’J ERA {ing - I. ' Atoms of a given element are identical. , I Atoms of different elements are different and have different properties. Which of the postulates is(are) no longer considered valid? A) (iii) and (iv) B) (iii) only 34) The name of the ionic compound V203 is A) vanadiumflll) trioxide B) vanadiumfll) oxide C) vanadium oxide divanadium trioxide "' nadium(III) oxide 35) There are A)3 E)4 22' Hus) -_ . F'" C) 3 and 4 D) 2, 3,. and 4 E) 1, 2,. 3, and 4 37) When the following equation is balanced, the coefficients are . 37) A1(N03)3 + Nags —1~ A1283 + NaN03 B—7 of 38) Convert the 17m II; into units of fathoms/fortnight. 38) Conversion fact rs that might fathom = 6 feet.) , (1 fortnight = 14 days), (1 inch = 2.54 ) . s 6.17 —3 B) 1 ----- C). 7 x 10 “- 9.56 E) 4.45 B-S ...
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Exam 1 Worked Key - Chemistry 1341 ‘ FaH,2009 EXAM 1 Test...

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