Chem1090 Test#1

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Author:
naegelekd
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176288
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Chem1090 Test#1
Updated:
2012-10-08 15:39:05
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chem1090
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Test #1
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  1. how many elements are there?
    118
  2. how many elements are not found on earth naturally
    28
  3. Main group elements
    • - groups 1, 2, 13-18 are the "A" team
    • - representative elements
    • - main group elements
  4. Transition Metals
    • - groups 3-12
    • - "B" group
  5. Inner transition metals
    28 elements at the bottom of the periodic table
  6. how many rows are there?
    7
  7. how many groups on the periodic table?
    18
  8. types of groups on the periodic table
    • - metals
    • - nonmetals
    • - metalloids
  9. Temperature conversions
    • F=C(1.8)+32
    • C=(F-32)/1.8
    • K=C+273.15
  10. Si Units
    • -7 total units
    • - we typically only use 5
  11. what is the atomic number?
    the number of the element itself
  12. what is the mass number?
    the atomic mass

    ex. He (Helium) atomic mass is 4.003
  13. what are isotopes?
    atoms that have the same atomic number but different mass number
  14. protons, neutrons, and electrons
    Subtract the number of protons from the isotope number to get the number of neutrons.
  15. Atomic mss
    the mass of an atom (AMU)

    Example - Isotopes 12C and 13C with AMU's 12.00000 and 13.003355 and natural abundance % of 98.93 and 1.07

    Average mass (C)= (0.9893)(12.00000amu)+(0.0107)(13.003355amu) = 12.01 amu
  16. atomic weight
    represents the average mass of the naturally occurring mixture of isotopes
  17. percent composition by mass
    • -% mass of an element= n(atomic mass of element)/molecular or formula mass of compound
    • - the multiply answer by 100%

    • example: molecular mass of ibuprofen C13H18O2
    • 13(12.01amu)+18(1.008amu)+2(16.00amu) = 206.27
  18. Density
    D=M/V or D=g/ml

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