Reference no: EM13848775

Question 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: 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 tetraphosphorustrisulfide, 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?

• Potassium superoxide
• Hydrogen peroxide
• Peroxydisulfuric acid
• Sodium persulfate

 

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?

• 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: 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: The oxidation number of chlorine in KClO4 is __________.

Question 7: Following Hurricane Katrina in 2005, what oxidizer did cleanup crews use to eradicate the mold that grew in homes __________?

Question 8: A dilute solution of __________ is effective in treating athlete's foot because of its oxidizing capabilities.

Question 9: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 __________.