Criminalistics Chapter 9

Flashcard maker : Elizabeth Mcdonald
Anything that has mass and occupies space is defined as [blank].
matter
The basic building blocks of all substances are the [blank].
elements
The number of elements know today is [blank].
118
An arrangement of elements by similar chemical properties is accomplished in the [blank] table.
periodic
An [blank] is the smallest particle of an element that can exist.
atom
Substances composed of two or more elements are called [blank].
compounds
A [blank] is the smallest unit of a compound formed by the union of two or more atoms.
molecule
The physical state that retains a definite shape and volume is a [blank].
solid
A gas (has, has no) definite shape or volume.
has no
During the process of [blank], solids go directly to the gaseous state, by passing the liquid state.
sublimation
The attraction forces between the molecules of a liquid are (greater, less) than those in a solid.
less
Different [blank] are separated by definite visible boundaries.
phase
Mass per unit volume defines the property of [blank].
density
If an object is immersed in a liquid of greater density, it will (sink, float).
float.
The bending of a light wave because of a change in velocity is called [blank].
refraction
The physical property of [blank] is determined by the ratio of the velocity of light in a vacuum to light’s velocity in a substance.
refractive index
T/F : Solids having an orderly arrangement of their constituent are crystalline.
True
Solids that have their atoms randomly arranged are said to be [blank].
amorphous
The crystal calcite has two indices of refraction. The difference between these two values is known as [blank].
birefringence
The process of separating light into its component colors or frequencies is know as [blank].
dispersion
T/F : Color is usually an indication that substances selectively absorb light.
True
The distance between two successive identical points on a wave is known as a [blank].
wavelength
T/F : Frequency and wavelength are directly proportional to one another.
False
Light, x-ray, and radio waves are all members of the [blank] spectrum.
electomagnetic
Red light is (high, lower) in frequency than violet light.
lower
A beam of light that has all of its waves pulsating in unison is called a [blank].
laser
One model of light depicts it as consisting of energy particles known as [blank].
photons
T/F : The energy of a light particle (photon) is directly proportional to its frequency.
True
Red light is (more, less) energetic than violet light.
less
A hard, brittle, amorphous substance composed mainly of silicon oxide is [blank].
glass
The two most useful physical properties of glass for forensic comparison are [blank] and [blank].
density/refractive index
T/F : Automobile headlights and heat-resistant glass, such as Pyrex, are manufactured with lime oxide added to the oxide mix.
True
[Blank] glass fragments into small squares, or ‘dices’ with little splintering when broken.
Tempered
[Blank] glass gains added strength from a layer of plastic inserted between two pieces of ordinary window glass; it is used in automobile windshields.
Laminated
Comparing the relative densities of glass fragments is readily accomplished by a method known as [blank].
flotation
When glass is immersed in a liquid of similar refractive index, its [blank] disappears and minimum contrast between the glass and liquid is observed.
beck line
The fracture lines radiating outward from a crack in glass are known as [blank] fractures.
radial
A crater-shaped hole in glass is (narrower, wider) on the side where the projective entered the glass.
narrower
T/F : It is easy to determine from the size and shape of a hole in glass whether it was made by a bullet or some other projectile.
False
A fracture line (will, will not) terminate at an existing line fracture.
will
Glass fracture lines that encircle that hole in the glass are known as [blank] fractures.
concentric
Collected glass fragment evidence should be packaged in [blank] containers to avoid further breakage.
solid
Glass-containing shoes and/or clothing should be individually wrapped in [blank] and transmitted to the laboratory.
paper

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