CHEMISTRY OFHAZARDOUS MATERIALS

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TOTAL OF 8 QUESTIONS. 2 ARE DISCUSSION QUESTIONS. 6 MULTIPLE CHOICE. SEE ATTACHMENT.

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?

[removed]		16.0%
[removed]		19.5%
[removed]		20.9%
[removed]		23.5%

A soil vapor extraction system equipped with carbon canisters is used to remediate gasoline contamination at a gas station. Which of the following statement is TRUE?

[removed]		Activated carbon in the canisters filters the gasoline vapors by the process of absorption.
[removed]		Activated carbon is charcoal heated in the absence of air at low temperatures.
[removed]		Activated carbon is an effective filter medium for gasoline vapors because of its small surface area.
[removed]		Activated carbon in the canisters filters gasoline vapors by the process of adsorption.