An element is selective in the frequency of light it will absorb or omit. This selectivity is due to its
A. Electron energy levels or electon orbitals
B. Number of neurons
C. Number of protons
Atomic absorption is _______ (more/less) senstive and accurate than atomic emission
Walsh invented the atomic absorption spectrometer, which is currently used worldwide to measure how any individual element?
________ and ________ are responsible for the colors in fireworks.
metal atom / compounds
Electrophoresis can be used in the crime lab to analyze what?
DNA & Proteins
Gas chromatography cannot produce a definitive identification of the chemical substance:
True / False
A compound can be identified by a gas chromatography from its:
A. Rf Value
B. Retention time
C. Peak height
D. Carrier Gas
A techniqu for separating and tentatively identifying is components of a mixture is:
A qualitative teset will reveal the _______ of a sample
Organic chemisty is the study of substances containing the element ___________
HPLC is mainly used to separate the following except:
Which of the following is an element?
The physical state that has both shape and volume is a:
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
The atomic emission spectrograph is used to determine the ________ composition of an inorganic substance
A "fingerprint" of an element is obtained by the techniques of:
A. Gas Chromatography
B. IR spectrophotometry
C. Atomic emission spectroscopy
D. TLC chromatography
E. UV spectrophotomerty
The techique commonly used to identify crystalline substances is:
X-ray diffraction techique had outstanding sensitivity. T/F
In neutron activation analysis, an element is identified by measuring the energy of emitting ____________?
A. Gamma rays
What two elements at trace levels of the bullet evidence were studied and compared in Kennedy assassination case?
Antimony and silver
The rate of alcohol absorption on a full stomach is ________ the rate of alcohol absorption on an empty stomach
A. Less than
B. The same as
C. Greater than
What are 2 factors in determining the rate at which alcohol is absorbed into the blood stream?
the amount consumed
Alcohol is oxidized in the body primarily in _______?
Alcohol can be eliminated from the body chemically unchanged in :
D. All of the above
The elimination of alcohol averages __________ per hour?
The ration of alcohol in the blood to alcohol in breath is approximately what?
Case 1: A person who has been poisened by antifreeze is given ___________
Field sobriety test include the following except:
A. horizontal gaze nystagmus test
B. walk and run
C. one-leg stand
Breath-testing devices for alcohol use ______ light to measure the quantity of alcohol are becoming popular
The analytical technique widely used for directly measuring the amount of alcohol present in blood is what?
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)
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. Decrease with time
B. Increase with time
C. Outcome is unpredicatable
D. Remain unchange
E. Either increase or decrease with time
Who can advise the toxicologist as to which analytical scheme to use to specifically identify a toxic substance?
Drug recognition expert (DRE)
A natural heat-producing process that may give rise to a fire is:
A. A chain reaction
B. Flash point
C. Ignition point
D. Spontaneous combustion
Carbon monoxide is toxic because it
A. Combines with hemoglobin to from carboxyhemoglobin
B. Cause brain damage due to over exposure to carbon atoms
C. Activates killer white blood cells
D. Causes platelets to clump
E. Destroys red blood cells
Gasoline residues are best characterized by:
A. ultraviolet spectrophotometry
B. Gas chromatrography
C. Atomic emission spectroscopy
D. Atomic absorption spectroscopy
E. Infrared spectrophotometry