Forensic EXAM2

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samanthaburnham
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139609
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Forensic EXAM2
Updated:
2012-03-04 18:55:37
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  1. An element is selective in the frequency of light it will absorb or omit. This selectivity is due to its
    A. Number of neurons
    B. Electron energy levels or electon orbitals
    C. Number of protons
    B.
    (this multiple choice question has been scrambled)
  2. Atomic absorption is _______ (more/less) senstive and accurate than atomic emission
    More
  3. Walsh invented the atomic absorption spectrometer, which is currently used worldwide to measure how any individual element?
    68
  4. ________ and ________ are responsible for the colors in fireworks.
    metal atom / compounds
  5. Electrophoresis can be used in the crime lab to analyze what?
    DNA & Proteins
  6. Gas chromatography cannot produce a definitive identification of the chemical substance:
    True / False
    True
  7. A compound can be identified by a gas chromatography from its:
    A. Rf Value
    B. Retention time
    C. Peak height
    D. Carrier Gas
    B.
    (this multiple choice question has been scrambled)
  8. A techniqu for separating and tentatively identifying is components of a mixture is:
    Chromatography
  9. A qualitative teset will reveal the _______ of a sample
    identity
  10. Organic chemisty is the study of substances containing the element ___________
    Carbon
  11. HPLC is mainly used to separate the following except:
    A. Explosives
    B. Proteins
    C. Sugars
    D. Drugs
    E. Alcohol
    E.
    (this multiple choice question has been scrambled)
  12. Which of the following is an element?
    A. Wood
    B. Water
    C. Aluminum
    D. Air
    E. Fire
    C
  13. The physical state that has both shape and volume is a:
    Solid
  14. What type of evidence would be expected to have trace elements?
    A. Glass and metals
    B. Paint and hair
    C. Soil and Fibers
    D. All of the Above
    D
  15. The atomic emission spectrograph is used to determine the ________ composition of an inorganic substance
    Elemental
  16. A "fingerprint" of an element is obtained by the techniques of:
    A. UV spectrophotomerty
    B. Atomic emission spectroscopy
    C. IR spectrophotometry
    D. TLC chromatography
    E. Gas Chromatography
    B.
    (this multiple choice question has been scrambled)
  17. The techique commonly used to identify crystalline substances is:
    x-ray diffraction
  18. X-ray diffraction techique had outstanding sensitivity. T/F
    False. 5%
  19. In neutron activation analysis, an element is identified by measuring the energy of emitting ____________?
    A. Protons
    B. Electrons
    C. Neutrons
    D. Gamma rays
    D
  20. What two elements at trace levels of the bullet evidence were studied and compared in Kennedy assassination case?
    Antimony and silver
  21. The rate of alcohol absorption on a full stomach is ________ the rate of alcohol absorption on an empty stomach
    A. Greater than
    B. Less than
    C. The same as
    B.
    (this multiple choice question has been scrambled)
  22. What are 2 factors in determining the rate at which alcohol is absorbed into the blood stream?
    • body weights
    • the amount consumed
  23. Alcohol is oxidized in the body primarily in _______?
    The liver
  24. Alcohol can be eliminated from the body chemically unchanged in :
    A. urine
    B. breath
    C. perspiration
    D. All of the above
    D.
  25. The elimination of alcohol averages __________ per hour?
    0.5 oz
  26. The ration of alcohol in the blood to alcohol in breath is approximately what?
    2100:1
  27. Case 1: A person who has been poisened by antifreeze is given ___________
    ethanol
  28. Field sobriety test include the following except:
    A. horizontal gaze nystagmus test
    B. walk and run
    C. one-leg stand
    D. Sit
    d
  29. Breath-testing devices for alcohol use ______ light to measure the quantity of alcohol are becoming popular
    Infrared
  30. The analytical technique widely used for directly measuring the amount of alcohol present in blood is what?
    Gas Chromatography
  31. In forensic toxicology, all postive finding must be confirmed by a specific chemical test. The confirmation test of choice is what?
    Gas Chromatorgraphy - mass spectromentry (GC-MS)
  32. Blood is drawn from a living suspect involved in an automobile accident. If the specimen is kept unrefrierated and at a moderately warm temperature the alcohol concertation can be expect to:
    A. Remain unchange
    B. Increase with time
    C. Either increase or decrease with time
    D. Outcome is unpredicatable
    E. Decrease with time
    E.
    (this multiple choice question has been scrambled)
  33. Who can advise the toxicologist as to which analytical scheme to use to specifically identify a toxic substance?
    Drug recognition expert (DRE)
  34. A natural heat-producing process that may give rise to a fire is:
    A. Flash point
    B. A chain reaction
    C. Ignition point
    D. Spontaneous combustion
    D.
    (this multiple choice question has been scrambled)
  35. Carbon monoxide is toxic because it
    A. Destroys red blood cells
    B. Causes platelets to clump
    C. Combines with hemoglobin to from carboxyhemoglobin
    D. Activates killer white blood cells
    E. Cause brain damage due to over exposure to carbon atoms
    C
  36. Gasoline residues are best characterized by:
    A. Atomic emission spectroscopy
    B. Atomic absorption spectroscopy
    C. ultraviolet spectrophotometry
    D. Infrared spectrophotometry
    E. Gas chromatrography
    E.
    (this multiple choice question has been scrambled)

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