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Forensic Science Chapter 6: Fibers Flashcards

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8858848657Synthetic fiberFibers that have been tampered with chemically0
8858848658FibersCommon trace evidence at a crime scene, made up of twisted filaments1
8858848659Natural FibersAnimal, vegetable or inorganic fibers2
8858848660List of artificial fibersRayon Nylon Acetate Spandex Acrylic Polyester3
8858848661List of natural fibersCotton Wool Silk Mohair Cashmere4
8858848662What was the first truly synthetic fiber to be discovered and sold?Nylon5
8858848663MonomersRepeating units of a polymer6
8858848664Tests for identification1. microscopic observation 2. burn test 3. thermal decomposition 4. chemical tests 5. density 6. refractive index 7. fluorescence7
8858848665FabricA cloth material made up of fibers woven or bonded together in a distinctive manner8
8858848666What is an electropherogram?Plot of results from an analysis done by electrophoresis.9
8858848667A gray cotton fiber was found on the red sweater of a victim. A gray cotton fiber was taken from a suspect's sweatshirt. After testing 900 gray sweatshirts, the lab found the fiber matches 45 of them. What is the probability that the crime scene fiber and that of the suspect matched simply by chance?45/900 = 1/20 (0.05)10
8858848668What are the most common items left at the crime scene?Hair and fiber.11
8858848669List at least four examples of synthetic fibersNylon, polyester, acrylic, plastic12
8858848670Is linen a natural or synthetic fiber?Natural13
8858848671What is a polymer?A molecule consisting of many repeating units. Can be naturally occurring or synthetic .14
8858848672List at least four examples of natural fibers.Cotton, wool, linen, silk15
8858848673What types of tests are used to test the dye in a particular fiber?Chemical tests or chromatography16
8858848674The Amanda Davies case showed the importance of what?Fiber transfer17
8858848675Which fiber will fluoresce under ultraviolet light?Cotton18
8858848676Who was the first person convicted on the basis of fiber evidence?Wayne Williams19
8858848677Which of the following properties should be examined when comparing two fibers?Diameter20
8858848678What does wool smell like when it is burned?Burning hair21
8858848679Becke lineA halo-like shadow around an object immersed in a liquid of a different refractive index.22
8858848680BlendA fabric composed of two or more different types of fiber.23
8858848681ChromatographyA method of separating components of mixtures.24
8858848682PlainSimplest and most common weave.25
8858848683DensityMass divided by volume.26
8858848684EluteTo extract one material from another.27
8858848685FilamentA single strand of material.28
8858848686SatinA diagonal weave pattern, denim is an example.29
8858848687ViscosityThe resistance of liquid.30
8858848688WeftThe crosswise yarn31
8858848689WarpThe lengthwise yarn.32
8858848690Fibers are considered what?Class evidence33
8858848691Nylon was developed when?193934
88588486921911Rayon35
88588486931920sCellulose and Acetate36

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