HAZARDOUS MATERIALS

HAZARDOUS MATERIALS

Question 1

 

 

 

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

 

 

 

1. 　

 

 

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

 

 

 

1. 　

 

 

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

 

 

 

1. 　

 

 

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

 

 

 

1. 　

 

 

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

 

 

 

1. 　

 

 

The vaporization of the liquid elements of gasoline constitutes a __________ change.

　

 

 

 

 

 

 

 

 

5 points 　

 

 

 

 

Question 7

 

 

 

1. 　

 

 

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

 

 

 

1. 　

 

 

Carbon disulfide is immiscible with water and sinks below the water because its specific gravity is __________ than 1.0.

　

 

 

 

 

 

5 points 　

 

 

 

Question 9

 

 

 

1. 　

 

 

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

 

 

 

1. 　

 

 

The relative reactivity rating of a substance is denoted by a numeric code in the __________ quadrant of its NFPA hazard diamond

 

 

 

 

 

Question 11

 

 

 

1. 　

 

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?

 

1. 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

　

 

 

 

 

 

 

25 points 　

 

 

 

Question 12

 

 

 

1. 　

 

 

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.

 

　

　

 

 

 

 

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.

 

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