Unit V Questions

Question 1

An old cooling tower is being demolished at a gas processing plant. Which of the following statements would be FALSE?

[removed]		Cr+6 can be found in the cooling tower debris.
[removed]		Workers could be exposed to Cr+6 during demolition if not wearing the appropriate PPE.
[removed]		Cr+6 will unlikely be found in subsurface soil.
[removed]		Exposure to Cr+6 can be by inhalation or ingestion.

Question 2

ABC Company was celebrating their working 1 million hours without a lost time incident by sponsoring a camping trip for their employees and their families. To light the campfire, one of the workers tried to use a match. When he rubbed the match head against the box, it did not ignite. Why?

[removed]		The worker used a strike-anywhere match instead of a safety match.
[removed]		The box did not contain red phosphorus and powdered glass.
[removed]		The match did not contain antimony trisulfide, sulfur, and potassium chlorate.
[removed]		The match contained tetraphosphorus trisulfide, sulfur, lead oxide, and powdered glass.

Question 3

What oxidizer is used to prepare the chemical referred to as piranha in the computer-chip industry?

Question 4

An oxidation number describes the combining capability of one ion to another ion or of one atom to another atom. Which of the following statements regarding oxidation numbers is FALSE?

[removed]		H2S contains sulfur which has an oxidation number of -2.
[removed]		Each oxygen in KMnO₄ has an oxidation number of -2, and the oxidation number of K is +1; therefore, the oxidation number on Mn in this compound is +7.
[removed]		The oxidation number of a monoatomic ion is the same as its ionic charge, such that Na ion has an oxidation number of +1.
[removed]		The oxidation number of each atom in an element is zero, such that the oxidation number of Cl₂ is -2.

Question 5

When bleach and ammonia are mixed, one of the chemical reactions is
2NaOCl + 2NH₃ → 2NaONH₃ + Cl₂. Which reactant undergoes reduction?

Question 6

Question 7

Following Hurricane Katrina in 2005, what oxidizer did cleanup crews use to eradicate the mold that grew in homes __________?

1. A dilute solution of __________ is effective in treating athlete’s foot because of its oxidizing capabilities.

1. One or more of the ions that do not participate in an oxidation-reduction reaction are called __________ ions.

Question 10

The components of ordinary gunpowder are elemental sulfur, charcoal, and potassium nitrate. When gunpowder explodes, these components react as follows:

3S₈(s) + 16C(s) + 32KNO₃(s)

Sulfur Carbon Potassium nitrate

16K₂O(s) + 16CO₂(g) + 16N₂(g) + 24SO₂(g)

Potassium oxide Carbon dioxide Nitrogen Sulfur dioxide

For this redox reaction, the reducing agents are __________ and __________.

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