This document contains 12 multiple choice and short answer questions related to chemistry and hazardous materials. The questions cover topics such as chemical properties, polar substances, solutions, chemical symbols, vapor pressure, DOT transportation requirements, and more. Responses are required to cite the provided textbook source and be a minimum of 75-200 words, depending on the question. Sources must be cited using APA format.

1. Question 1
In a two-dimensional risk assessment matrix, risk is the
combination of probability and __________.
severity
frequency
loss
exposure
Question 2
In the course textbook, the author proposes that a hazard is a
__________ with potential for causing harmful consequences.
result
source
mechanism
factor
Question 3
In an event tree, time progresses from __________.

2. right to left
top to bottom
bottom to top
left to right
Question 4
Which of the following is not one of Bloom's six levels of
development?
Comprehension
Efficacy
Synthesis
Evaluation
Question 5
Public health funding for injury prevention efforts is low due to
the general public and legislatures believing that injuries are
which of the following?
Preventable

3. Costly
Inconsequential
Inevitable
Question 6
Provide an example of a risk reduction method that acts by
reducing the severity of the harm.
Your response must be at least 75 words in length. You are
required to use at least your textbook as source material for
your response. All sources used, including the textbook, must
be referenced; paraphrased and quoted material must have
accompanying citations.
Reference: Jensen, R. C. (2012). Risk-reduction methods for
occupational safety and health. Hoboken, NJ: John Wiley &
Sons.
Question 7
Provide two occupational examples of an individual and
equipment level system other than the ones listed in Table 1.1
of the course textbook.
Your response must be at least 75 words in length. You are
required to use at least your textbook as source material for
your response. All sources used, including the textbook, must
be referenced; paraphrased and quoted material must have
accompanying citations.
Reference: Jensen, R. C. (2012). Risk-reduction methods for
occupational safety and health. Hoboken, NJ: John Wiley &
Sons.
Question 8
Briefly explain the difference between physical models and
physics models. Provide an example of each.

4. Your response must be at least 75 words in length. You are
required to use at least your textbook as source material for
your response. All sources used, including the textbook, must
be referenced; paraphrased and quoted material must have
accompanying citations.
Reference: Jensen, R. C. (2012). Risk-reduction methods for
occupational safety and health. Hoboken, NJ: John Wiley &
Sons.
Question 9
Why is it important to consider the full lifecycle of a system
when identifying and controlling hazards?
Your response must be at least 75 words in length. You are
required to use at least your textbook as source material for
your response. All sources used, including the textbook, must
be referenced; paraphrased and quoted material must have
accompanying citations.
Reference: Jensen, R. C. (2012). Risk-reduction methods for
occupational safety and health. Hoboken, NJ: John Wiley &
Sons.
Question 10
Briefly explain the major differences between event trees and
analytical trees.
Your response must be at least 75 words in length. You are
required to use at least your textbook as source material for
your response. All sources used, including the textbook, must
be referenced; paraphrased and quoted material must have
accompanying citations.
Reference: Jensen, R. C. (2012). Risk-reduction methods for
occupational safety and health. Hoboken, NJ: John Wiley &
Sons.
Question 11

5. You have been asked to explain the difference between hazard
and risk to a colleague who is not a safety professional. Write
an explanation that uses at least three examples.
Your response must be at least 200 words in length. You are
required to use at least your textbook as source material for
your response. All sources used, including the textbook, must
be referenced; paraphrased and quoted material must have
accompanying citations.
Reference: Jensen, R. C. (2012). Risk-reduction methods for
occupational safety and health. Hoboken, NJ: John Wiley &
Sons.
Question 12
Consider the graphic relationship model for the generic user-
stairway-environment interaction shown in Figure 3.1 (p. 26) in
the course textbook. Assume that you need to investigate an
incident involving a colleague who was seriously injured due to
a fall while descending a flight of stairs. The colleague admitted
to being distracted by an attractive coworker who was ascending
the stairs. Explain how you might use the model to help you
think about the distraction factor is relation to the other
factors.
Your response must be at least 200 words in length. You are
required to use at least your textbook as source material for
your response. All sources used, including the textbook, must
be referenced; paraphrased and quoted material must have
accompanying citations
Reference: Jensen, R. C. (2012). Risk-reduction methods for
occupational safety and health. Hoboken, NJ: John Wiley &
Sons.
Question 1

6. Identify which two of the following elements have chemical
properties similar to those of magnesium.
strontium and potassium
strontium and beryllium
berryllium and cesium
cesium and potassium
Question 2
The fuel used in some racing cars contains isoamyl nitrite.
Select which one of the characteristics below is classified as a
chemical change/property?
Isoamyl nitrite is a yellowish liquid having an ethereal odor.
At 77°F (25°C) isoamyl nitrite has a specific gravity in the
range 0.865-0.875.
Isoamyl nitrite is nearly insoluble in water.
Isoamyl nitrite decomposes when exposed to light.
Question 3
Polar substances are described as:
a congregation of positive and negative charges on opposite

7. ends of the molecules.
molecules that are diatomic.
molecules that possess only single atoms, also known as
monatomic.
molecules that only have positively charged ions.
Question 4
An ionic or covalent compound that is used commercially in the
form of a homogeneous mixture of two or more substances is
called a:
solvent.
solute.
solution.
substance.
Question 5
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?

8. The Pb concentration is equivalent to 0.015 ppb and therefore
meets the drinking water standard.
The Pb concentration is equivalent to 15 ppb and therefore
meets the drinking water standard.
The Pb concentration is equivalent to 150 ppb and therefore
does not meet the drinking water standard.
The Pb concentration is equivalent to 1,500 ppb and therefore
does not meet the drinking water standard.
Question 6
The vaporization of the liquid elements of gasoline constitutes a
__________ change.
Question 7
__________ is either absorbed or emitted when there is a
change in the physical state of a substance such as ice that is
melting.
Question 8
The relative reactivity rating of a substance is denoted by a
numeric code in the __________ quadrant of its NFPA hazard
diamond.
Question 9
The Global Harmonization System of Classification and
Labeling of Chemical Substances (GHS) was designed by the
__________.
Question 10
Solids possess a definite __________ and a definite __________
except for certain solid plastics due to their elasticity.

9. Question 11
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
length. You are required to use at least your textbook as source
material for your response. All sources used, including the
textbook, must be referenced. Paraphrased and/or quoted
material must have accompanying citations in APA format.
Reference
Meyer, E. (2014). Chemistry of hazardous materials (6th ed.).

10. Upper Saddle River, NJ: Pearson.
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. You are required to use at least your textbook
as source material for your response. All sources used,
including the textbook, must be referenced. Paraphrased and/or
quoted material must have accompanying citations in APA
format.
Reference
Meyer, E. (2014). Chemistry of hazardous materials (6th ed.).
Upper Saddle River, NJ: Pearson.