Glass is considered to be....solid, liquid, gas, or an amorphous solid
What is an amorphous solid?
100
Glass is primarily made of silica. T/F
What is -- True
100
In the Coors kidnapping case, the key evidence was found on
What is - the remains of the kidnapper’s car?
100
One of the tests used to classify white powders is based on solubility. The solubility of a substance is based on
What is - its ability to dissolve when a solvent such as water is added?
100
When one substance is added to another, the evolution of gas bubbles indicates
What is - a chemical change?
200
In examining a glass fracture pattern, the radial lines are
What is cracks that extend out from the point of impact?
200
A topographic map is one that shows
What is geographic features of an area?
200
Can lip prints be considered to have individual characteristics? Y/N
What is - Yes?
200
The pH of a substance indicates whether it is acidic or basic. Acids have a pH of
What is - less then 7?
200
Chromatography can be used to determine environmental contamination. T/F
What is - True
300
In the eyes of a forensic scientist glass evidence is considered to be..
What is ---depending on the circumstances?
300
A mineral is defined as any naturally occurring crystalline solid. T/F
What is - True?
300
In Case study 9.2 -A Web of Trace Evidence - what trace evidence provided a break in the case leading to identification of the suspects?
What is - the use of a credit card from the murder victim?
300
A glass fragment is dropped into a test tube filled with a particular liquid. If the fragment floats on the surface, the density of the glass is __________ the density of the liquid.
What is - less than?
300
A simple and inexpensive test for metal ions is
What is -paper chromatography?
400
A technique(s) that is/are frequently used to compare glass samples is/are
What is -becke line and the use of density gradient tubes?
400
The forensic definition of soil is
What is - a mixture of mineral grains, organic matter, and any other materials mixed with the sample
400
List the lips patterns studied in forensic science
What is Branching grooves, crosshatching, short horizontal and vertical lines?
400
To examine the chemical properties of metal add __________ and look for a color change or the evolution of bubbles.
What is - an acid and/or base?
400
When you use paper chromatography for metal analysis, the _________ phase is the filter or chromatography paper.
What is stationary phase?
500
Physically fitting a missing piece of glass into the original would produce an individual characteristic.
What is - True
500
The sequence of the layers were important in the Conviction. Name the Case study
What is - Coors Kidnapping?
500
the halo that is observed near the border of a particle that is immersed in a liquid or on a hot plate?
What is - Becke line?
500
A glass fragment is dropped into a test tube filled with a particular liquid. If the fragment is suspended in the middle of the liquid, the density of the fragment is __________ the density of the liquid.
What is - - equal to?
500
What causes metal salts to show colors in a flame?
What is heat from flame excite electrons in atoms to higher energy levels. The visible wavelength is due to the falling of the electron to lower energy levels