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CHMM Test Study Guide Questions with
Detailed Verified Answers
General Properties of Organic Compounds
⼀Answer:- - Melt and boil at lower temperatures
- As # C's and the MW increase, BP/MP increase
- Flammable, unstable, especially triple bonds
- Triple bonds can: Polymerize, Spontaneously react with, Oxygen,
Explode. Keep triple bonds away from: Heat & Oxygen/Oxidizers
- Presence of halogens increases stability
- Many are water in-soluble i.e. they sink such as CCl4, MeCl2, PCBs
etc
- Some are polar if they contain hetero oxygen atom such as ketones,
aldehyde, alcohols, carboxylic acid etc.
- A common toxic effect of uncontrolled exposure to organic solvent
vapors is: CNS depression
Chemical Hazards:
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⼀Answer:- - Fire
- Corrosion
- Polymerization
- Explosion
- Thermal Decomposition
- Water Reactivity
- Incompatibility
Physical Hazards
⼀Answer:- - Engulfment
- Overpressurization
- Thermal
- Mechanical
- Electrical
- Slips/trips/falls
Flash Point
⼀Answer:- The lowest temperature that will produce a vapor
concentration high enough ti propagate a flame when a source of
ignition is present
Halogenated Hydrocarbon
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⼀Answer:- More Toxic Organic Chemicals
7- Common OSHA Chemical Hazards:
⼀Answer:- Flammables, Corrosives, Oxidizers, Reactives, Explosives,
Toxics, and Radioactive
(i) Flammables
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⼀Answer:- Flammable: Flash point is the temperature at which a
liquid gives off enough vapor to be ignited in air by a spark or other
ignition source. In general liquids/solids do not burn, their vapors do.
Highly flammable, pose a risk of liberation of a toxic gas, or pose an
explosion hazard.
Fire Tetrahedron: fuel, heat, oxygen, and free radicals
- F.P. ≤ 140ºF (EPA calls it ignitable)
-F.P. ≤ 141ºF (DOT calls it flammable)
-F.P. between 100 and 200 ºF (DOT calls it combustible)
-F.P. ≤ 100 ºF (OSHA calls it flammable)
-Fire Triangle: Fuel, heat and oxygen
-Fire Tetrahedron: O2, heat, fuel, free radicals
-Flammability Limits (Upper Flammability Limit): higher end of range of
fuel/air vapor mixture when it will burn upon ignition.
-Flammability Limits (Lower Flammability Limits): lower end of range of
fuel/air vapor mixture when it will burn upon ignition.
-Autoignition Temperature: Some materials will ignite spontaneously at
a given temperature without any source of ignition.
-Analytical Test for flammability: "closed cup"
Using the concept of Lower Flammability Limits (LEF) & Upper
Flammability Limit (UFL), when will a vapor will burn
⼀Answer:- above its LEF and below UFL, a vapor will burn
What is the easiest way to avoid fire and explosion when working
with flammables?
CHMM Test Study Guide Questions with
Detailed Verified Answers
General Properties of Organic Compounds
⼀Answer:- - Melt and boil at lower temperatures
- As # C's and the MW increase, BP/MP increase
- Flammable, unstable, especially triple bonds
- Triple bonds can: Polymerize, Spontaneously react with, Oxygen,
Explode. Keep triple bonds away from: Heat & Oxygen/Oxidizers
- Presence of halogens increases stability
- Many are water in-soluble i.e. they sink such as CCl4, MeCl2, PCBs
etc
- Some are polar if they contain hetero oxygen atom such as ketones,
aldehyde, alcohols, carboxylic acid etc.
- A common toxic effect of uncontrolled exposure to organic solvent
vapors is: CNS depression
Chemical Hazards:
, Page | 2
⼀Answer:- - Fire
- Corrosion
- Polymerization
- Explosion
- Thermal Decomposition
- Water Reactivity
- Incompatibility
Physical Hazards
⼀Answer:- - Engulfment
- Overpressurization
- Thermal
- Mechanical
- Electrical
- Slips/trips/falls
Flash Point
⼀Answer:- The lowest temperature that will produce a vapor
concentration high enough ti propagate a flame when a source of
ignition is present
Halogenated Hydrocarbon
, Page | 3
⼀Answer:- More Toxic Organic Chemicals
7- Common OSHA Chemical Hazards:
⼀Answer:- Flammables, Corrosives, Oxidizers, Reactives, Explosives,
Toxics, and Radioactive
(i) Flammables
, Page | 4
⼀Answer:- Flammable: Flash point is the temperature at which a
liquid gives off enough vapor to be ignited in air by a spark or other
ignition source. In general liquids/solids do not burn, their vapors do.
Highly flammable, pose a risk of liberation of a toxic gas, or pose an
explosion hazard.
Fire Tetrahedron: fuel, heat, oxygen, and free radicals
- F.P. ≤ 140ºF (EPA calls it ignitable)
-F.P. ≤ 141ºF (DOT calls it flammable)
-F.P. between 100 and 200 ºF (DOT calls it combustible)
-F.P. ≤ 100 ºF (OSHA calls it flammable)
-Fire Triangle: Fuel, heat and oxygen
-Fire Tetrahedron: O2, heat, fuel, free radicals
-Flammability Limits (Upper Flammability Limit): higher end of range of
fuel/air vapor mixture when it will burn upon ignition.
-Flammability Limits (Lower Flammability Limits): lower end of range of
fuel/air vapor mixture when it will burn upon ignition.
-Autoignition Temperature: Some materials will ignite spontaneously at
a given temperature without any source of ignition.
-Analytical Test for flammability: "closed cup"
Using the concept of Lower Flammability Limits (LEF) & Upper
Flammability Limit (UFL), when will a vapor will burn
⼀Answer:- above its LEF and below UFL, a vapor will burn
What is the easiest way to avoid fire and explosion when working
with flammables?
