Exam 14: Metals, Paint, and Soil

It is not necessary that the collected paint from a vehicle involved in a hit-and-run accident be close to the area of the car suspected of being in contact with the victim.

ICP emission spectrophotometry can be used to obtain an ________ profile of a questioned bullet fragment for comparison against an unfired bullet found in the possession of the suspect.

A ________ element is an element found in very small quantities.

Which of the following is a non-destructive technique for identifying and quantifying trace elements in a test sample?

Match the word in Column 1 to its definition in Column 2. Each answer can only be used once. A)An atom differing from another atom of the same element in the number of neutrons in its nucleus B)A type of emission spectrum showing a series of lines separated by black areas C)A particle with no electrical charge that is one of the basic structures in the nucleus of an atom D)The state in which an atom absorbs energy and an electron moves from a lower to a higher energy level E)A negatively charged particle that is one of the fundamental structural units of the atom F)Light emitted from a source and separated into its component colors or frequencies G)The number of protons in the nucleus of an atom H)The sum of the number of protons and neutrons in the nucleus of an atom I)The path of electrons as they move around the nuclei of atoms J)A positively charged particle that is one of the basic structures in the nucleus of an atom -Electron Orbital

A "fingerprint" of an element is obtained by the technique of:

All atoms of an element have the same number of neutrons.

Isotopes are atoms of the same element that have different numbers of protons in their respective nuclei.

Paint specimens are best compared side by side under a ________ microscope.

The three basic subatomic particles are the proton, electron, and ________.

What is NOT part of the composition of paint?

Mutilated bullets are often not suitable for traditional microscopic comparisons against an exemplar test-fired bullet.

In a simple emission spectrograph, excitation of the specimen under investigation is accomplished with a(n):

A continuous spectrum is most helpful in identifying a particular element because it serves as a unique "fingerprint" of an element.

________ are atoms of the same element that have different numbers of neutrons in their respective nuclei.

Neutron activation analysis is favored in crime laboratories because of its low cost and ease of use.

After examining small paint chips from an auto accident scene and using the PDQ database, the crime lab worker can determine the ________ of the vehicle.

Match the word in Column 1 to its definition in Column 2. Each answer can only be used once. A)An atom differing from another atom of the same element in the number of neutrons in its nucleus B)A type of emission spectrum showing a series of lines separated by black areas C)A particle with no electrical charge that is one of the basic structures in the nucleus of an atom D)The state in which an atom absorbs energy and an electron moves from a lower to a higher energy level E)A negatively charged particle that is one of the fundamental structural units of the atom F)Light emitted from a source and separated into its component colors or frequencies G)The number of protons in the nucleus of an atom H)The sum of the number of protons and neutrons in the nucleus of an atom I)The path of electrons as they move around the nuclei of atoms J)A positively charged particle that is one of the basic structures in the nucleus of an atom -Electron

Loose soil, soil adhering to a garment, and lumps of soil adhered to a car are found at a crime scene. How must the investigator collect and package each?

Match the word in Column 1 to its definition in Column 2. Each answer can only be used once. A)An atom differing from another atom of the same element in the number of neutrons in its nucleus B)A type of emission spectrum showing a series of lines separated by black areas C)A particle with no electrical charge that is one of the basic structures in the nucleus of an atom D)The state in which an atom absorbs energy and an electron moves from a lower to a higher energy level E)A negatively charged particle that is one of the fundamental structural units of the atom F)Light emitted from a source and separated into its component colors or frequencies G)The number of protons in the nucleus of an atom H)The sum of the number of protons and neutrons in the nucleus of an atom I)The path of electrons as they move around the nuclei of atoms J)A positively charged particle that is one of the basic structures in the nucleus of an atom -Atomic mass