Question 1. Which of the following statements regarding oxygen is FALSE?
There are three allotropes of oxygen: GOX, LOX, and ozone.
LOX is cryogenic oxygen.
Gaseous oxygen under increased pressure is called hyperbaric oxygen.
Industrial facilities that use large quantities of oxygen often store it as the cryogenic liquid.
Question 2. Where in the Emergency Response Guidebook (ERG) can an environmental health and safety (EHS) and/or fire service (FS) professional find the initial isolation distance for a small leak of a phosphorus trichloride?
Green section
Orange section
Yellow section
Orange and green sections
Question 3. A contractor was hired to do some maintenance work inside a grain silo. Assuming the facility is at sea level, what is the minimum level of oxygen necessary for the contractor to carry out his or her task without using a supplied air respirator?
16.0%
19.5%
20.9%
23.5%
Question 4. During the chlorination of drinking water and wastewater, what is it that makes chlorine an effective microbiocide?
The formation of hypochlorous acid
The formation of trihalomethanes
The formation of hydrogen chloride
The formation of metallic chloride
Question 5. Firefighters are advised to use dry sand rather than wet sand to extinguish a small red phosphorus fire, why?
Red phosphorus reacts with water to form phosgene.
Red phosphorus reacts with water to form phosphine.
Red phosphorus reacts with water to form tetraphosphorus decoxide.
Red phosphorus reacts with water and becomes white phosphorus which has a low auto ignition point.
Question 6. Although coal is no longer the favored energy source, U.S. coal mines still produced close to a billion short tons of coal. Match the description of the following chemical products obtained from or related to coal.
Coke
Carbon black
Coal gas
Coal tar pitch
Coal tar
Creosote oil
Coal tar distillate
Anthracite
Lignite
Charcoal
A. Residue left after coal is heated to 350 deg C in the absence of air
B. Mixture consisting of ammonia, carbon monoxide, hydrogen cyanide, methane, and hydrogen sulfide produced when coal is heated in the absence of air
C. Solid residue that is left when coal and coal tar pitch are heated in the absence of air
D. A finely divided form of carbon that is produced when coal tar burns in a furnace with limited air
E. Coal that has 0.4 to 1.9% sulfur content
F. Liquid produced from the heating of coal that can be used for waterproofing when sealing roofs
G. Any fraction obtained by distilling coal tar
H. Coal that has a specific gravity of 1.29
I. Product obtained from the distillation of coal tar
J. Residue remaining
7Coal gasification electric power plants are now operating commercially in the United States and in other nations. This technology produces clean-burning hydrogen that can be transferred to customer facilities by pipeline. Hydrogen can also be transported in bulk by highway or rail.
If there is a spill of liquid hydrogen, why will it likely burst into flame spontaneously?
Why do experts recommend the use of a thermal-imaging camera for detecting a hydrogen leak from a pipe fitting connected to a steel cylinder of hydrogen?