Forensic EXAM2

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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 protons
    B. Electron energy levels or electon orbitals
    C. Number of neurons
    (this multiple choice question has been scrambled)
  2. Atomic absorption is _______ (more/less) senstive and accurate than atomic emission
  3. Walsh invented the atomic absorption spectrometer, which is currently used worldwide to measure how any individual element?
  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
  7. A compound can be identified by a gas chromatography from its:
    A. Rf Value
    B. Peak height
    C. Carrier Gas
    D. Retention time
    (this multiple choice question has been scrambled)
  8. A techniqu for separating and tentatively identifying is components of a mixture is:
  9. A qualitative teset will reveal the _______ of a sample
  10. Organic chemisty is the study of substances containing the element ___________
  11. HPLC is mainly used to separate the following except:
    A. Sugars
    B. Alcohol
    C. Drugs
    D. Proteins
    E. Explosives
    (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
  13. The physical state that has both shape and volume is a:
  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
  15. The atomic emission spectrograph is used to determine the ________ composition of an inorganic substance
  16. A "fingerprint" of an element is obtained by the techniques of:
    A. Atomic emission spectroscopy
    B. TLC chromatography
    C. Gas Chromatography
    D. IR spectrophotometry
    E. UV spectrophotomerty
    (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
  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. The same as
    B. Less than
    C. Greater than
    (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
  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?
  27. Case 1: A person who has been poisened by antifreeze is given ___________
  28. Field sobriety test include the following except:
    A. horizontal gaze nystagmus test
    B. walk and run
    C. one-leg stand
    D. Sit
  29. Breath-testing devices for alcohol use ______ light to measure the quantity of alcohol are becoming popular
  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. Outcome is unpredicatable
    C. Decrease with time
    D. Either increase or decrease with time
    E. Increase with time
    (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. Spontaneous combustion
    B. A chain reaction
    C. Ignition point
    D. Flash point
    (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
  36. Gasoline residues are best characterized by:
    A. Infrared spectrophotometry
    B. ultraviolet spectrophotometry
    C. Gas chromatrography
    D. Atomic emission spectroscopy
    E. Atomic absorption spectroscopy
    (this multiple choice question has been scrambled)
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Forensic EXAM2
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