HAZARDOUS MATERIALS Question 1 Polar substances are described as: [removed] a congregation of positive and negative charges on opposite ends of the molecules. [removed] molecules that are diatomic. [removed] molecules that possess only single atoms, also known as monatomic. [removed] molecules that only have positively charged ions. 5 points 　 Question 2 Decide why the heat from a candle flame is barely tolerable when a person places his or her hand above the candle compared to when the hand is placed next to the candle. [removed] The highest temperature is at the tip of the candle flame. [removed] Hot air rises upward, not sideways, by the mechanism of convection. [removed] Hot air rises upward, not sideways by the mechanism of conduction. [removed] The highest temperature is at the base of the candle flame. 5 points 　 Question 3 The fuel used in some racing cars contains isoamyl nitrite. Select which one of the characteristics below is classified as a chemical change/property? [removed] Isoamyl nitrite is a yellowish liquid having an ethereal odor. [removed] At 77 � F (25 � C) isoamyl nitrite has a specific gravity in the range 0.865-0.875 . [removed] Isoamyl nitrite is nearly insoluble in water. [removed] Isoamyl nitrite decomposes when exposed to light. 5 points 　 Question 4 The lead (Pb) concentration detected from a water-supply well is 0.15 mg/l (assume specific gravity of the well water is 1.0 at 25 deg C). If the drinking water standard is 15 ppb, what is your evaluation of this data? [removed] The Pb concentration is equivalent to 0.015 ppb and therefore meets the drinking water standard. [removed] The Pb concentration is equivalent to 15 ppb and therefore meets the drinking water standard. [removed] The Pb concentration is equivalent to 150 ppb and therefore does not meet the drinking water standard. [removed] The Pb concentration is equivalent to 1,500 ppb and therefore does not meet the drinking water standard. 5 points 　 Question 5 An area measuring 400 ft � 120 ft is engulfed in a raging forest fire. During a single pass over the fire, a water-bearing helicopter drops sufficient water to extinguish a burning area measuring 20 m � 20 m. Assuming the fire remains confined within the original area, how many passes must four helicopters make to extinguish the fire? [removed] 3 [removed] 2 [removed] 4 [removed] 5 5 points 　 Question 6 The vaporization of the liquid elements of gasoline constitutes a __________ change. Words:0 5 points 　 Question 7 Radon, which is a radioactive gas, is a member of the __________ gas family. Name one other element in this group or family: __________. 5 points 　 Question 8 Carbon disulfide is immiscible with water and sinks below the water because its specific gravity is __________ than 1.0. 5 points 　 Question .

1. HAZARDOUS MATERIALS
Question 1
Polar substances are described as:
[removed]
a congregation of positive and negative charges on opposite
ends of the molecules.
[removed]
molecules that are diatomic.
[removed]
molecules that possess only single atoms, also known as
monatomic.
[removed]
molecules that only have positively charged ions.
5 points

2. Question 2
Decide why the heat from a candle flame is barely tolerable
when a person places his or her hand above the candle compared
to when the hand is placed next to the candle.
[removed]
The highest temperature is at the tip of the candle flame.
[removed]
Hot air rises upward, not sideways, by the mechanism of
convection.
[removed]
Hot air rises upward, not sideways by the mechanism of
conduction.
[removed]
The highest temperature is at the base of the candle flame.
5 points

3. Question 3
The fuel used in some racing cars contains isoamyl nitrite.
Select which one of the characteristics below is classified as a
chemical change/property?
[removed]
Isoamyl nitrite is a yellowish liquid having an ethereal odor.
[removed]
At 77
�
F (25
�
C) isoamyl nitrite has a specific gravity in the range 0.865-
0.875
.
[removed]
Isoamyl nitrite is nearly insoluble in water.
[removed]
Isoamyl nitrite decomposes when exposed to light.
5 points

4. Question 4
The lead (Pb) concentration detected from a water-supply well
is 0.15 mg/l (assume specific gravity of the well water is 1.0 at
25 deg C). If the drinking water standard is 15 ppb, what is your
evaluation of this data?
[removed]
The Pb concentration is equivalent to 0.015 ppb and therefore
meets the drinking water standard.
[removed]
The Pb concentration is equivalent to 15 ppb and therefore
meets the drinking water standard.
[removed]
The Pb concentration is equivalent to 150 ppb and therefore
does not meet the drinking water standard.
[removed]
The Pb concentration is equivalent to 1,500 ppb and therefore
does not meet the drinking water standard.

5. 5 points
Question 5
An area measuring 400 ft
�
120 ft is engulfed in a raging forest fire. During a single pass
over the fire, a water-bearing helicopter drops sufficient water
to extinguish a burning area measuring 20 m
�
20 m. Assuming the fire remains confined within the original
area, how many passes must four helicopters make to extinguish
the fire?
[removed]
3
[removed]
2
[removed]
4
[removed]
5

6. 5 points
Question 6
The vaporization of the liquid elements of gasoline constitutes a
__________ change.
Words:0
5 points
Question 7

7. Radon, which is a radioactive gas, is a member of the
__________ gas family. Name one other element in this group
or family: __________.
5 points
Question 8
Carbon disulfide is immiscible with water and sinks below the
water because its specific gravity is __________ than 1.0.
5 points
Question 9

8. Two buckets of unidentified liquid were discovered by a fire
inspector at an abandoned warehouse. The __________ of the
liquid can be measured with a hydrometer
5 points
Question 10
The relative reactivity rating of a substance is denoted by a
numeric code in the __________ quadrant of its NFPA hazard
diamond
Question 11

9. You are the project manager of an environmental company that
was hired to cleanup a historical arsenic contamination site.
Soil sampling results indicated the area impacted with arsenic
above action levels is 30 feet by 55 feet. The depth of the
arsenic plume is three feet below ground surface. The land
owner wanted to clean this site for future development. Using
your textbook, answer the questions below to help you prepare a
cost estimate for this portion of the project.
Your solutions and any assumptions to justify your estimate
must be shown
.
What is the chemical symbol of arsenic, and what group/family
does it belong to?
Solve for the minimum volume of soil that will be excavated in
cubic yards?
If each dump truck can transport 18 cubic yards, determine how
many dump trucks loads will be transported? For calculation
purposes, add a 15%
�
fluff factor
�
(add to the volume that will be transported).
If the bulk density of soil is 1350 kg/m3 (84.3 lb/ft3), solve for
the weight of the soil that will be transported to a disposal site
in kilograms?
Your total response to parts a-d must be at least 200 words in

10. length
25 points
Question 12
This is a two-part question:
Part 1: Methanol and toluene are flammable liquids whose
vapor pressures at 68ºF (20ºC) are 96 and 22 mmHg,
respectively. Based solely on this data, determine which
compound poses the greater risk of fire and explosion at 68ºF
(20ºC). Explain your choice. In general, discuss how vapor
pressure affects the volatility of a liquid?
Part 2: If the liquid in Part 1 is transferred into a container for
transportation, why does DOT require that the container not be
filled to the brim? Discuss your answer.
Your total response to Part 1 and Part 2 must be at least 200
words in length.

11. 13 Discuss why knowledge of the field of chemistry might be
important to an emergency responder. Give some examples to
support any arguments you present to the class.
.