Firefighters are advised to use dry sand rather than wet sand to extinguish a small red phosphorus fire, why?

An employee at a municipal water treatment plant was experiencing chest pain, nausea, and burning of the eyes and throat. The industrial hygienist has determined that it may be due to chlorine exposure at which levels?

Question 1

1.

An employee at a municipal water treatment plant was experiencing chest pain, nausea, and burning of the eyes and throat. The industrial hygienist has determined that it may be due to chlorine exposure at which levels?

1-hr exposure at 0.5 – 2 ppm

1-hr exposure at 2 – 20 ppm

1-hr exposure at > 20 ppm

8-hr exposure at 1 ppm

Question 2

1.

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 autoignition point.

Question 3

1.

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

1.

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 5

1.

Diamond and graphite are the two primary allotropes of carbon. Neither is generally considered hazardous, but they have their own specific uses. Choose which of the following statements is TRUE regarding these allotropes.

Diamond and graphite undergo phase changes from solid to liquid at moderately high temperature.

Diamond and graphite do not burn.

Diamond and graphite have different chemical structures.

Diamond and graphite are poor conductors of heat

Question 6

1.

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.

-A.B.C.D.E.F.G.H.I.J.

Coke

-A.B.C.D.E.F.G.H.I.J.

Carbon black

-A.B.C.D.E.F.G.H.I.J.

Coal gas

-A.B.C.D.E.F.G.H.I.J.

Coal tar pitch

-A.B.C.D.E.F.G.H.I.J.

Coal tar

-A.B.C.D.E.F.G.H.I.J.

Creosote oil

-A.B.C.D.E.F.G.H.I.J.

Coal tar distillate

-A.B.C.D.E.F.G.H.I.J.

Anthracite

-A.B.C.D.E.F.G.H.I.J.

Lignite

-A.B.C.D.E.F.G.H.I.J.

Charcoal

A.

Coal that has a specific gravity of 1.29

B.

Residue remaining after wood, nut shells or peach pits are heated in the absence of air

C.

Liquid produced from the heating of coal that can be used for waterproofing when sealing roofs

D.

Solid residue that is left when coal and coal tar pitch are heated in the absence of air

E.

Mixture consisting of ammonia, carbon monoxide, hydrogen cyanide, methane, and hydrogen sulfide produced when coal is heated in the absence of air

F.

A finely divided form of carbon that is produced when coal tar burns in a furnace with limited air

G.

Coal that has 0.4 to 1.9% sulfur content

H.

Any fraction obtained by distilling coal tar

I.

Residue left after coal is heated to 350 deg C in the absence of air

J.

Product obtained from the distillation of coal tar

1. Coal 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.

a. If there is a spill of liquid hydrogen, why will it likely burst into flame spontaneously?

b. 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?

Your total response must be at least 200 words in length.

1. A chlorine manufacturing company offers a rail carrier 2700 lb (1227 kg) of liquefied compressed chlorine for transportation contained in a ton-container.

a. Describe how this rail carrier will comply with DOT transportation requirements.

b. Provide at least two examples to demonstrate the corrosive nature of chlorine gas.

Your total response must be at least 200 words in length.

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