Chemhw1 - 1. /0.1 points 0/3 submissions Notes

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1. –/0.1 points 0/3 submissions Notes What is the identity of the element X in the following ions? (a) X 2+ , a cation that has  36  electrons  Sr2+ (b) X  - , an anion that has  36  electrons  Br- 2. –/0.1 points 0/3 submissions Notes Write formulas for the following compounds. (Type your answer using the  format CO2 for CO 2 .) (a) lithium phosphate  Li3PO4 (b) magnesium hydrogen sulfate  Mg(HSO4)2 (c) manganese(II) nitrate  Mn(NO3)2 (d) chromium(III) sulfate  Cr2(SO4)3
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3. –/0.1 points 0/3 submissions Notes How many atoms of copper are in a pure copper penny that weighs 2.15 g?  (1 amu = 1.6605  10 -24  g) atoms 2.037756887e22 2.038267717e22  2.038e22?  2.04e22 4. –/0.1 points 0/3 submissions Notes In nature, the element X consists of two naturally occurring isotopes.  107 with abundance 55.34% and isotopic mass 106.9051 amu and  109 X with  isotopic mass 108.9048 amu. Use the given information to calculate the  atomic mass of the element X to an accuracy of .001% (Report your  answer like this yyy.yyyy) Atomic Mass = amu. 107.7982
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5. –/0.1 points 0/3 submissions Notes Each of the following nuclides is used in medicine. Indicate the number of  protons and neutrons in each nuclide. (a)  technetium-99 protons  43 neutrons  56 (b)  phosphorus-32   protons  15 neutrons  17 (c)  cobalt-60   protons  27 neutrons  33 6. –/0.1 points 0/3 submissions Notes Fill in the gaps in the following table assuming each column represents a  neutral atom. (Type your answers in the first row using the format 55K for  55 K.) Symbol 46 Ti 103Rh 34Se 75Re 88Sr Protons 22 45 16 52 38
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Neutrons 24 58 18 75 50 Electrons 22 45 16 52 38 Atomic no. 22 45 16 52 38 Mass no. 46 103 34 127 88 7. –/0.1 points 0/3 submissions Notes Locate each of the following elements in the periodic table; indicate  whether it is a metal, metalloid, or nonmetal; and give the name of the  element. (a)  Cd      Cadmium metal metal  nonmetal      metalloid  (b)  As    Arsenic metalloid nonmetal  metal      metalloid 
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(c)  Sc  Scandium metal metal  nonmetal      metalloid  8. –/0.1 points 0/3 submissions Notes Choose the correct empirical formula corresponding to each of the  following molecular formulas. (a)  C 7 H 15 C 14 H 30   C 7 H 15       C (b)  C 6 H 10 O 2 C 3 H 5 O   C C 6 H 10 O 2       (c)  N 2 O 4 NO 2   C NO      9. –/0.1 points 0/3 submissions Notes
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Which of the following are ionic, and which are molecular? (a) Sc
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This note was uploaded on 10/02/2011 for the course CHEM 1201 taught by Professor Cook during the Fall '08 term at LSU.

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Chemhw1 - 1. /0.1 points 0/3 submissions Notes

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