2 Assignments- Pro Sendric ONLY

Question 1

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 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?

		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.

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.). 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.