Unit V Questions Question 1 1. An old cooling

Unit V Questions

Question 1

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

Cr+6 can be found in the cooling tower debris.

Workers could be exposed to Cr+6 during demolition if not wearing the appropriate PPE.

Cr+6 will unlikely be found in subsurface soil.

Exposure to Cr+6 can be by inhalation or ingestion.

Question 2

1. 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?

The worker used a strike-anywhere match instead of a safety match.

The box did not contain red phosphorus and powdered glass.

The match did not contain antimony trisulfide, sulfur, and potassium chlorate.

The match contained tetraphosphorus trisulfide, sulfur, lead oxide, and powdered glass.

Question 3

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

Potassium superoxide

Hydrogen peroxide

Peroxydisulfuric acid

Sodium persulfate

Question 4

1. 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?

H2S contains sulfur which has an oxidation number of -2.

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.

The oxidation number of a monoatomic ion is the same as its ionic charge, such that Na ion has an oxidation number of +1.

The oxidation number of each atom in an element is zero, such that the oxidation number of Cl2 is -2.

Question 5

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

NaOCl

NH3

Cl2

NaO

Question 6

1. The oxidation number of chlorine in KClO4 is __________.

Question 7

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

Question 8

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

Question 9

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

Question 10

1. 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 __________.