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CHMM Test Study Guide Questions and
Correct Answers/ Latest Update / Already
Graded
General Properties of Organic Compounds
Ans: - 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:
Ans: - Fire
- Corrosion
- Polymerization
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- Explosion
- Thermal Decomposition
- Water Reactivity
- Incompatibility
Physical Hazards
Ans: - Engulfment
- Overpressurization
- Thermal
- Mechanical
- Electrical
- Slips/trips/falls
Flash Point
Ans: The lowest temperature that will produce a vapor
concentration high enough ti propagate a flame when a source
of ignition is present
Halogenated Hydrocarbon
Ans: More Toxic Organic Chemicals
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7- Common OSHA Chemical Hazards:
Ans: Flammables, Corrosives, Oxidizers, Reactives, Explosives,
Toxics, and Radioactive
(i) Flammables
Ans: 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.
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-Analytical Test for flammability: "closed cup"
Using the concept of Lower Flammability Limits (LEF) & Upper
Flammability Limit (UFL), when will a vapor will burn
Ans: above its LEF and below UFL, a vapor will burn
What is the easiest way to avoid fire and explosion when working with
flammables?
Ans: Control Ignition Sources
(ii) Corrosives
Ans: -DOT definition: Liquid/solid that will cause visible tissue
destruction or severe corrosion on steel/Aluminium
-GHS definition: 6.25 mm (0.25 in) per year or irreversible
damage to skin
(iii) Oxidizers
Ans: presence of oxygen needed to cause burning, rapid
exothermic reaction. Oxidizer + Organics = Explosion
Perchloric Acid
All rights reserved © 2025/ 2026 |
CHMM Test Study Guide Questions and
Correct Answers/ Latest Update / Already
Graded
General Properties of Organic Compounds
Ans: - 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:
Ans: - Fire
- Corrosion
- Polymerization
All rights reserved © 2025/ 2026 |
, Page |2
- Explosion
- Thermal Decomposition
- Water Reactivity
- Incompatibility
Physical Hazards
Ans: - Engulfment
- Overpressurization
- Thermal
- Mechanical
- Electrical
- Slips/trips/falls
Flash Point
Ans: The lowest temperature that will produce a vapor
concentration high enough ti propagate a flame when a source
of ignition is present
Halogenated Hydrocarbon
Ans: More Toxic Organic Chemicals
All rights reserved © 2025/ 2026 |
, Page |3
7- Common OSHA Chemical Hazards:
Ans: Flammables, Corrosives, Oxidizers, Reactives, Explosives,
Toxics, and Radioactive
(i) Flammables
Ans: 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.
All rights reserved © 2025/ 2026 |
, Page |4
-Analytical Test for flammability: "closed cup"
Using the concept of Lower Flammability Limits (LEF) & Upper
Flammability Limit (UFL), when will a vapor will burn
Ans: above its LEF and below UFL, a vapor will burn
What is the easiest way to avoid fire and explosion when working with
flammables?
Ans: Control Ignition Sources
(ii) Corrosives
Ans: -DOT definition: Liquid/solid that will cause visible tissue
destruction or severe corrosion on steel/Aluminium
-GHS definition: 6.25 mm (0.25 in) per year or irreversible
damage to skin
(iii) Oxidizers
Ans: presence of oxygen needed to cause burning, rapid
exothermic reaction. Oxidizer + Organics = Explosion
Perchloric Acid
All rights reserved © 2025/ 2026 |
