Chem Final Exam 1372 - ViewAttempt1of1 Title Started...

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View Attempt 1 of 1  Title: FE Started: May 1, 2008 4:21 PM Submitted: May 1, 2008 6:12 PM Time spent: 01:51:40  Total score: 26/30 = 86.67%   Total score adjusted by 0.0  Maximum possible score: 30  1.      The hypothetical metal Q has two isotopes,  50 Q (isotopic mass 49.9715 amu, abundance  24.32%),  52 Q (isotopic mass 51.9663 amu). Calculate the atomic mass of Q to two decimal  places and do not put units.     Student  Response Correct  Answer Answer 51.48   51.48    Score: 1/1    2.   
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  An atom of the isotope chlorine-39 consists of how many protons, neutrons, and electrons? (p =  proton, n= neutron, e = electron)     Stud ent  Res pon se Corr ect  Ans wer a.  17  p,  17  n.  22 e    b.  39  p,  38  n,  39 e    c.  22  p,  17  n,  17 e    d.  17  p,  39 
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  In a hydrogen atom, from what energy level must an electron fall to the n = 3 level to give a line  at 1.28  m in the infrared region?     Stud ent  Res pon se Corr ect  Ans wer a.  2    b.  4    c.  5    d.  6    e.  7       Score:
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  Which of the following quantum number combinations are allowed?     Stud ent  Res pons e Corr ect  Ans wer a.  n  =  2;  = 0;  m l  =  –1    b.  n  =  4;  = 3;  m l  =  –1    c.  n  =  5;  = 2;  m l  =  +3    d.  n  =  2;  = 0;  m l  = 
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  Give names for the formulas or formulas for the names of the following compounds: N 2 O 3     Stud ent  Res pons e Corr ect  Ans wer a.  nitro gen  oxid e(III)    b.  dinitr oge oxid e(III)    c.  nitro gen  trioxi de    d.  dinitr oge trioxi
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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 34.4 g propane, calculate the moles of the compound to three significant dgits.     Student  Response Correct  Answer Answer .782   0.78    Score: 1/1    7.   
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  Which of these ions is/are NOT commonly found in stable ionic compounds? A) Cs 2+  B) Cl -  C) S 2-  D) Al 3+  E) Br 2-     Stud ent  Res pon se Corr ect  Ans wer a.  A),  B)    b.  B),  E)    c.  A),  E)    d.  A),  B),  E)    e.  D),  E)      
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