CHEM 1372 Final Exam 2 - ViewAttempt1of1 Title Started...

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View Attempt 1 of 1  Title: FE Started: December 12, 2008 12:57 PM Submitted: December 12, 2008 2:41 PM Time spent: 01:43:41  Total score: 29/30 = 96.6%   1.   
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  Suppose that the radioactive element Technetium (Tc, Z = 43) has three isotopes:  97 Tc  (21.72%, 96.98 amu),  98 Tc (58.70%, 97.97 amu and  99 Tc (98.94 amu). What is the atomic mass  of Tc as it would appear in the periodic table? Calclate to 2 decimal places and do not the enter  units.     Student  Response Correct  Answer Answer 97.94   97.95    Score: 1/1   
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  What is the sum of the numbers of neutrons and electrons in the ion  31 P 2-  ?     Student  Response Correct  Answer Answer 33   33    Score: 1/1    3.   
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  What is the frequency in Hz of the photon released when a hydrogen atom undergoes a  transition from the excited state where n = 5 to the state where n = 1?  Enter your answer with three significant figures in the form 1.23E-4 representing 1.23 x 10 -4 . Do  not enter the units with your answer.     Student  Response Correct  Answer Answer 3.16E15   3.16E15  (3.16  ×   10 15 )    Score: 1/1   
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What feature of an orbital is most directly related to the principal quantum number ( n )?     Stud ent  Res pons e Corr ect  Ans wer a.  the  shap e of  the  orbit al    b.  the  num ber  of  elect rons  withi n an  orbit al    c.  the 
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  Give formulas for the following compounds: chlorine trifluoride and pentaphosphorus heptasulfide     Stud ent  Res pons e Corr ect  Ans wer a.  ClF 3 5PS 7    b.  ClF P 5 S 7    c.  Cl 3 F,  P 3 S 9    d.  Cl 3 F P 5 S 7   
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6.      Propane, C 3 H 8 , is widely used in liquid form as a fuel for barbecue grills and camp stoves.  Given 71.5 g propane, calculate the moles of the compound to three significant dgits.     Student  Response Correct  Answer Answer 1.62   1.62    Score: 1/1   
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  Choose the correct Lewis electron-dot symbol for the atom below. Kr     Stud ent  Res pons e Corr ect  Ans wer a.     b.     c.     d.    
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  State the number of important resonance forms for this ion.  HCO 2  (H is attached to C)     Stud ent  Res pons e Corr ect  Ans wer a.  1    b.  2    c.  3    d.  4    e.  non e of  thes e
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