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Question 1

What are the elements that must be present if combustion is to be initiated and sustained?

Answer 1

1.Fuel
2.Oxygen with sufficient quantity with fuel
3.Heat must be applied to initiate reaction
4.Enough heat must be produced to sustain the reaction

Question 2

How are most arson fires started?

Answer 2

Most arsons are started by petroleum distillates such as gasoline or kerosene

Question 3

What must a search of the fire scene by a forensic investigator focus on?

Answer 3

Finding the fires origin because it will help most in finding any accelerants or ignition device.

Question 4

How is a gas chromatograph used to identify an accelerant?

Answer 4

By comparing select graphic peaks, a forensic analyst can identify the accelerant used to initiate the fire.

Question 5

What is the combination of oxygen with other substances to produce new substances?

Answer 5

Oxidation

Question 6

What is the chemical breakdown of solid organic matter by heat with the gaseous products combining with Oxygen to produce a fire?

Answer 6

Pyrolysis

Question 7

What do most criminalists consider the most sensible and reliable instrument for detecting and characterizing flammable residues?

Answer 7

Gas chromatography mass spectrometry

Question 8

Correctly identify the mechanisms of heat transfer.

Answer 8

1.Conduction is the heat transfer through a solid object

2.Convection is the heat transfer between molecules in a liquid or gas

3.Radiation is the transfer of heat from a heated surface to a cooler surface with electromagnetic radiation.

Question 9

What are the common sign of arson?

Answer 9

Separate unconnected fires such as severe burning on the floor as opposed to the ceiling

Streamers

Accelerants

Ignition device

Question 10

Identify an example of heat transfer and its most likely result.

Answer 10

Radiation from a burning structure can ignite nearby combustible material through heat transfer.

Question 11

Explain spontaneous combustion and under what conditions it will occur?

Answer 11

Spontaneous combustion is an exothermic reaction caused by natural heat-producing process with oxygen present

Question 12

Which type of explosive is classified into two groups, primary and secondary?

Answer 12

High explosives

Question 13

Low explosives decompose at rates that vary up to

Answer 13

1,000 m/second

Question 14

In recent years, dynamite has been replaced commercially by…

Answer 14

ammonium nitrate

Question 15

What is the single most important step in the detection and analysis of explosive residues?

Answer 15

Proper collections and preservation of evidence at crime scene.

Question 16

After bomb-scene debris has been examined microscopically, what is the next step?

Answer 16

Rinsed with acetone to separate debris from explosive material.

Question 17

What produces the violent physical disruption associated with an explosion?

Answer 17

The sudden buildup of expanding gas pressure at the origin of an explosion produces the violent physical disruption

Question 18

What are the ingredients required to create a low explosive?

Answer 18

Black powder and smokeless powder

Question 19

What substances are included in modern straight dynamites?

Answer 19

Modern straight dynamite is composed of nitroglycerin, sodium nitrate, good stabilizing agent and pulp

Question 20

What is a device used to create an explosion needed to ignite a high explosive and how does it work?

Answer 20

A detonator