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NAME ________________________________________ PERIOD __________ FORENSIC SCIENCE Ms. Stark-Houck Chapter 11 Supplemental Questions 1. A “fingerprint” of an element is obtained by the technique of: a. Infrared spectrophotometry b. Ultraviolet spectrophotometry c. Gas chromatography d. Emission spectroscopy e. Thin-layer chromatography 2.Which of the following statements is FALSE? a. Protons and neutrons comprise the nucleus of an atom. b. The proton has a charge of plus one. c. The neutron has no electrical charge. d. The electron and proton have the same mass. e. An atom has an equal number of protons and electrons. 3. The atoms of hydrogen, deuterium, and tritium all have the same number of protons, but differ in the number of neutrons they possess. These substances are: a. Elements b. Compounds c. Molecules d. Radioactive e. Isotopes 4. In neutron activation analysis, an element is identified by measuring the energy of emitting: a. Protons b. Electrons c. Neutrons d. Gamma rays e. Alpha rays 5. Gamma rays are: a. Electrons b. Protons c. Neutrons d. Alpha particles e. Electromagnetic radiation 6. Which of the following statements is correct? a. All atoms of an element have the same atomic mass number. b. All atoms of an element have the same number of protons. c. All atoms of an element have the same number of neutrons. d. The number of protons in the nucleus of an atom is called the atomic mass number. e. All atoms of an element have an equal number of neutrons and electrons. 7. The emission spectrograph is used to determine: a. The mass of a substance b. The weight of a substance c. The crystalline structure of a substance d. The elemental composition of a substance e. All of the above 8. Paint chips may be individualized to a single source by examining their: a. Infrared spectra b. Ultraviolet spectra c. d. Color and layer structure Pyrograms 9. The polymeric makeup of paint binders can readily be compared by: a. Emission spectroscopy b. Thin-layer chromatography c. Microscopy d. Layer structure e. Pyrolysis gas chromatography 10. Automobile finishes typically contain which layer(s)? a. Colorcoat b. An electrocoat primer, colorcoat, and clearcoat c. Clearcoat d. Electrocoat primer and colorcoat e. None of the above 11. A technique frequently used to compare soils is: a. The immersion method b. Density-gradient tubes c. Flotation d. Becke Line e. Dispersion 12. Describe the proper collection and preservation of paint evidence from an automobile suspected of being involved in a hit-and-run incident. Paint that is foreign to the suspect automobile is observed on the hood. 13. A suspect has been found miles from the scene of a murder. Soil is found adhering to the suspect’s shoe. Describe the proper collection and preservation of soil evidence that will permit a thorough comparison of the soil on the shoe to soil at the crime site.