CHMM PRACTICE EXAM QUESTIONS AND ANSWERS
When polonium (atomic mass 210 & atomic number 84) emits an alpha particle, which of the following
decay products results?
a. Bismuth (atomic mass 209 & atomic number 83)
b. Lead (atomic mass 206 & atomic number 82)
c. Thallium (atomic mass 204 & atomic number 81)
d. Mercury (atomic mass 201 & atomic number 80) - CORRECT ANSWER✅✅b. Lead (atomic mass 206 &
atomic number 82)
Atomic Mass is:
a. the number of protons in the nucleus
b. the total number of protons & neutrons in the nucleus
c. a nuclear particle that has an atomic weight of one and is electrically neutral
d. a particle that contains all the positive charge and essentially all the weight of the atom - CORRECT
ANSWER✅✅b. the total number of protons & neutrons in the nucleus
Which of the following is not a chemical asphyxiant?
a. carbon monoxide
b. carbon dioxide
c. hydrogen sulfide
d. hydrogen cyanide - CORRECT ANSWER✅✅c. hydrogen sulfide
Which of the following displaces oxygen but does not actually interfere with
the human body's ability to use oxygen?
a. carbon dioxide
b. nitrogen
c. noble gases
d. all of the above - CORRECT ANSWER✅✅d. all of the above
,Which of the following statements regarding oxidation is always correct?
a. oxygen must be a chemical reactant for an oxidation reaction to occur
b. oxidation is a violent reaction that always produces heat and light
c. oxidation always results in at least one electron being transferred from one atom to another
d. the valence of the atom is reduced occurs when it gives up an oxidation electron - CORRECT
ANSWER✅✅c. oxidation always results in at least one electron being transferred from one atom to
another
Which of the following seven steps for preparing hazardous materials for transport is in the correct
order?
a. proper shipping name, classify, package, mark, label, paperwork, placard
b. classify, proper shipping name, package, mark, label, paperwork, placard
c. package, classify, proper shipping name, mark, label, paperwork, placard
d. package, mark, label, classify, proper shipping name, paperwork, placard - CORRECT ANSWER✅✅b.
classify, proper shipping name, package, mark, label, paperwork, placard
Boiling Point is the temperature at which:
a. the vapor pressure of a solid just equals atmospheric pressure
b. the vapor pressure of a liquid is greater than atmospheric pressure
c. the vapor pressure of a liquid is less than atmospheric pressure
d. the vapor pressure of a liquid just equals atmospheric pressure - CORRECT ANSWER✅✅d. the vapor
pressure of a liquid just equals atmospheric pressure
Flash point is the:
a. maximum temperature of a liquid at which it give off vapors sufficient to form an ignitable mixture
with air
b. maximum temperature of a liquid at which it gives off vapors sufficient to form an ignitable mixture
with water
c. minimum temperature of a liquid at which it gives off vapors sufficient to form an ignitable mixture
with air
, d. minimum temperature of a liquid at which it gives off vapors sufficient to form an ignitable mixture
with water - CORRECT ANSWER✅✅c. minimum temperature of a liquid at which it gives off vapors
sufficient to form an ignitable mixture with air
BLEVE is the acronym for:
a. Boiling Liquids Evaporate Very Expensively
b. Boiling Liquids Erode Very Efficiently
c. Boiling Liquids End Vapor Explosions
d. Boiling Liquid Expanding Vapor Explosion - CORRECT ANSWER✅✅d. Boiling Liquid Expanding Vapor
Explosion
Cobalt-60 has a 5 year half life. If the initial activity of a Cobalt-60 source is 20 mCi, what is the activity
after 10 years in mCi?
a. 5
b. 0
c. 2
d. 10 - CORRECT ANSWER✅✅a. 5
The exposure rate at a distance of 1 foot from a radioactive source is 20 rnR/hr. What is the exposure
rate in mR/hr. at 10 feet?
a. 0.1
b. 0.2
c. 0.3
d. 0.4 - CORRECT ANSWER✅✅b. 0.2
Which of the following is not regulated by EPA as an environmentally toxic metal?
a. arsenic
b. lead
c. cadmium
d. iron - CORRECT ANSWER✅✅d. iron
When polonium (atomic mass 210 & atomic number 84) emits an alpha particle, which of the following
decay products results?
a. Bismuth (atomic mass 209 & atomic number 83)
b. Lead (atomic mass 206 & atomic number 82)
c. Thallium (atomic mass 204 & atomic number 81)
d. Mercury (atomic mass 201 & atomic number 80) - CORRECT ANSWER✅✅b. Lead (atomic mass 206 &
atomic number 82)
Atomic Mass is:
a. the number of protons in the nucleus
b. the total number of protons & neutrons in the nucleus
c. a nuclear particle that has an atomic weight of one and is electrically neutral
d. a particle that contains all the positive charge and essentially all the weight of the atom - CORRECT
ANSWER✅✅b. the total number of protons & neutrons in the nucleus
Which of the following is not a chemical asphyxiant?
a. carbon monoxide
b. carbon dioxide
c. hydrogen sulfide
d. hydrogen cyanide - CORRECT ANSWER✅✅c. hydrogen sulfide
Which of the following displaces oxygen but does not actually interfere with
the human body's ability to use oxygen?
a. carbon dioxide
b. nitrogen
c. noble gases
d. all of the above - CORRECT ANSWER✅✅d. all of the above
,Which of the following statements regarding oxidation is always correct?
a. oxygen must be a chemical reactant for an oxidation reaction to occur
b. oxidation is a violent reaction that always produces heat and light
c. oxidation always results in at least one electron being transferred from one atom to another
d. the valence of the atom is reduced occurs when it gives up an oxidation electron - CORRECT
ANSWER✅✅c. oxidation always results in at least one electron being transferred from one atom to
another
Which of the following seven steps for preparing hazardous materials for transport is in the correct
order?
a. proper shipping name, classify, package, mark, label, paperwork, placard
b. classify, proper shipping name, package, mark, label, paperwork, placard
c. package, classify, proper shipping name, mark, label, paperwork, placard
d. package, mark, label, classify, proper shipping name, paperwork, placard - CORRECT ANSWER✅✅b.
classify, proper shipping name, package, mark, label, paperwork, placard
Boiling Point is the temperature at which:
a. the vapor pressure of a solid just equals atmospheric pressure
b. the vapor pressure of a liquid is greater than atmospheric pressure
c. the vapor pressure of a liquid is less than atmospheric pressure
d. the vapor pressure of a liquid just equals atmospheric pressure - CORRECT ANSWER✅✅d. the vapor
pressure of a liquid just equals atmospheric pressure
Flash point is the:
a. maximum temperature of a liquid at which it give off vapors sufficient to form an ignitable mixture
with air
b. maximum temperature of a liquid at which it gives off vapors sufficient to form an ignitable mixture
with water
c. minimum temperature of a liquid at which it gives off vapors sufficient to form an ignitable mixture
with air
, d. minimum temperature of a liquid at which it gives off vapors sufficient to form an ignitable mixture
with water - CORRECT ANSWER✅✅c. minimum temperature of a liquid at which it gives off vapors
sufficient to form an ignitable mixture with air
BLEVE is the acronym for:
a. Boiling Liquids Evaporate Very Expensively
b. Boiling Liquids Erode Very Efficiently
c. Boiling Liquids End Vapor Explosions
d. Boiling Liquid Expanding Vapor Explosion - CORRECT ANSWER✅✅d. Boiling Liquid Expanding Vapor
Explosion
Cobalt-60 has a 5 year half life. If the initial activity of a Cobalt-60 source is 20 mCi, what is the activity
after 10 years in mCi?
a. 5
b. 0
c. 2
d. 10 - CORRECT ANSWER✅✅a. 5
The exposure rate at a distance of 1 foot from a radioactive source is 20 rnR/hr. What is the exposure
rate in mR/hr. at 10 feet?
a. 0.1
b. 0.2
c. 0.3
d. 0.4 - CORRECT ANSWER✅✅b. 0.2
Which of the following is not regulated by EPA as an environmentally toxic metal?
a. arsenic
b. lead
c. cadmium
d. iron - CORRECT ANSWER✅✅d. iron
