quiz chap7 Flashcards
The powder that is used in ammunition in the propulsion of projectile
Gunpowder
Gunpowder in the 19th Century was known as
black powder
Considered the oldest propellant
Black powder
It is a mixture of sulfur, charcoal, and potassium nitrate (saltpeter) - with the sulfur and charcoal acting asfuels, while the saltpeter works as an oxidizer
Blackpowder
developed smokeless gunpowder and he called it Ballistite, a double-base propellant
Alfred E. Nobel
the unrecognized inventor of gunpowder
Wu Ching Tsun
an English monk and scientist, credited with the invention of gunpowder(black powder).
Roger Bacon
A German monk was credited for the application of gunpowder for propelling missile
Constantine Anklitzen
invented smokeless gunpowder with nitrocellulose, a single-base propellant which was called Poudre B (composition of ether and alcohol)
Pual Vielle
obtained a patent of modifying smokeless gunpowder, they
called it Cordite
federick abel & james dewar
produces small amount of smoke
smokeless powder
consists of jet black and shiny grains
black powder
is the principal ingredient of smokeless powder, invented in 1846
guncotton
The 1st examination and detection of GSR was done
1911
was the 1st to use Paraffin Wax to collect GSR, from then, it was popularly called today as Paraffin test
Dr. Iturriuz (1914)
In 1933, he made a demonstrated the use of paraffin cast in Criminal Identification Laboratory of Mexico, USA which was called
Dermal Nitrates Test, Diphenylamine Test and Gonzales
Test
performed a modified version of the Iturriuz Test using molten paraffin wax on the hands of firer.
Theodoro Gonzales (1931)
Positive result of Paraffin test.
blue color or blue specks
most common
hand
as stated by Edmond Locard, when two objects come into contact, exchange take place.
Locard’s Principle
with the use of cotton with 5% Nitric Acid Solution, particles maybe collected
cotton swabs
used for Scanning Electron Microscope (SEM) analysis
adhesive stubs
refers to the gunpowder residues that exits on all openings of a FA after discharge
plumes
the most important consideration in dealing with GSR evidence
time factor
The standard Time Frame from the time of shooting BUT in some cases, it may persist much longer is?
3-6 hours
The Traditional belief to remove GSR on hands is by application of
vinegar
the most efficient method
employed in the analysis of GSR, computerized
ICP-MSP (inductively coupled plasma-mass spectroscopy plasma)
detects the presence of nitrates and nitrites
Diphenylamine test
used in the analysis of inorganic
materials in primer residue such as Ba and Sb
GFAAS (Gra[hite furnace atomic absorption spectroscopy)
detects presence of Lead Styhpnate (pb)
Sodium Rhodizonate Test
detects presence of nitrates in unburned or partially burned gunpowder, this is also used by the investigator to detect the Range.
Walker test
both detect nitrites, same with Greiss test
Marshall and Tiwari test
detects Nitrites
Greiss Test
are normally employed as propellants for guns. Undergo deflagration from a few centimeters per second to approx 400M per second.
low explosives
the chemical used to indicate the presence of nitrocellulose
lunge reagent
Unlawful Manufacture, Sale, Acquisition, Disposition or Possession of Explosives
RA 8294, Sec 3
also known as double-base powder. Undergo detonation from 914 to 9140 meters per second.
high explosives
extremely sensitive to chemical shock, friction and heat such as Fulminate Mercury, Lead Styphnate & Lead Azide.
primary explosive
insensitive to shock, friction and heat because there is a need to expose them to heat or flame to boost their power, like Dynamite (developed by Alfred Nobel), TNT, RDX, PETN and HMX
secondary explosive
– are also called blasting agents, such as Ammonium Nitrate/Fuel Oil Mixture
tertiary explosives
have SLOW burning gunpowder
long arms
