Upgrade to remove ads
Forensics study set for test 3-5 notes
Terms in this set (48)
What type of property describes a substance w/h reference to any other substance?
What type of property describes the behavior of a substance when it reacts or combines with another substance?
Drug reagent changes colors when comes into contact with drug
The measure of heat intensity, or the hotness or coldness of a substance is called
What are the 2 common temperature scales
Fahrenheit and Celsius
Which scale is commonly used by scientists
The force in which gravity attracts a body is called
The amount of matter in an object is called its
Is independent of it's location on earth or anywhere else in the universe. This means if you were too measure this physical property on earth and then again on the moon, the number would stay the same
Which physical property is known as mass per unit volume
If an objects density is GREATER than the density of the fluid you place it in, the object will
If an object's density is LESS than the density of the fluid you place it in, the object will
The ration of the velocity of light in a vacuum to the ratio of light in a medium is called the
Density and refractive index are known as INTENSIVE PROPERTIES. What does this mean
It is the same no matter the size of the sample
A solid that is made up of crystals in which particles are arranged in a regular, repeating pattern
A solid made up of particles that are not arranged in a regular pattern
What is an example of an amorphous solid?
What is the main ingredient in ordinary glass?
What is soda-lime glass? What important characteristic does it have?
Will not dissolve in water, makes up most automatic and bottle glass
Resistance to heat // added to glass. It's use is mainly cooking
Extremely strong and it has multiple uses
Banded together with plastic film. Mainly used in U.S. windshields
What is the difference between class evidence and individual evidence?
Individual is a unique trait of a group, Class is a group of traits and items.
Wear Patterns evident on shoe print impressions
A piece of metal is chipped off the head of a screw driver
Explain how broken glass from a crime scene is individual evidence
It has different, individually broken types of glass fragments, none which are the same.
Using density to identify a piece of glass to a common source is known as the
Using the refractive index to identify a piece of glass to a common source is known as the
Explain in terms of refractive index why a piece of glass seems to "disappear" when placed in a solution.
At the match point, it disappears b/c of the becke line and the refractive index
Explain how you would know the if broken glass was a projectile fracture
There are both radial and concentric fractures
How would you know if a projectile glass feature was caused by a bullet or a rock.
The bullet would leave evidence of gunshot residue on the glass and often leave a round, crater-shaped one surrounded by a nearly symmetrical pattern of radial an concentric cracks.
Differentiate b/t concentric and radial fractures. Which one happens first? What side of the glass do they form on in reference to the force being applied?
Radial happens first on the opposite of the applied force, Concentric happens last on the same side
What is the 3R rule?
Radial cracks form right angles on the reverse side of the force
What is any disintegrated surface material, both natural and artificial, that lies on or near the earth's surface?
What might soil evidence include?
Rocks, vegetation, animal matter, glass or asphalt etc.
Soil can be identified on its
Appearances and/or mineral composition
You are a forensic lab technician that has just been given a soil sample from a crime scene. What is a good first step in analyzing this sample?
Compare to a dry soil sample depending on color and texture
What is a density-gradient tube? How is it used in forensics?
A glass tube filled from top to bottom with liquids of higher densities. It is used to determine the density distribution.
How do you properly package glass evidence?
All glass must be collected and must be submitted with reference samples found at scene if no fit can be completed
How do you properly package soil evidence?
Carefully preserved and not removed from garments. Collected within 100 yd radius of the crime scene and must be the top layer of the soil and collected intact.
YOU MIGHT ALSO LIKE...
Forensics Chapter 4 Review Questions
Forensics- Chapter 3/4
Forensics Test Review
Forensics Glass and Sand Unit