Chapter 13 and 14.docx - Chapter 13 1 The presence of Trace elements in materials provides useful invisible markers when comparing physical evidence 7

Chapter 13 and 14.docx - Chapter 13 1 The presence of Trace...

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Chapter 13 1. The presence of Trace elements in materials provides useful “invisible” markers when comparing physical evidence. 7. The knowledge that elements selectively absorb and emit light provides the basis for important analytical techniques designed to detect the presence of elements in materials. 11. A line spectrum of an element (is , is not) characteristic of the element. 14. Atoms differing only in the number of neutrons present in their nuclei are called Isotopes . 21. The two most important components of dried paint from the criminalist’s point of view are the pigments and the Binders . 23. Paints can be individualized to a single source only when they have a sufficiently detailed Layer structure. . 27. True or False: Emission spectroscopy can be used to identify the components of paint’s pigments. 28.Trueor False: Paint samples removed for examination must always include all of the paint layers. 30. Naturally occurring crystals commonly found in soils are Minerals33. True .

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