1. compounds oxidize when they lose hydrogen atoms. an example is the


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


Question 3

  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 4

  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 5

  1. Which of the following oxidizers is the most hazardous?



Potassium permanganate



Potassium chlorate



Potassium peroxide



Potassium dichromate

Question 6

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

Question 7

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 __________.


Question 8

  1. Shipping bales of unprocessed cotton alongside a boxcar containing concentrated perchloric acid is potentially hazardous since 60 to 72.5% perchloric acid is an NFPA __________ oxidizer that causes a severe increase in the burning rate of the cotton.

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 oxidation number of chlorine in KClO4 is __________.


Question 11

  1. Ammonium nitrate is the most commercially important chemical product containing the ammonium ion.
    1. List and describe at least two grades of commercially available ammonium nitrate.
    2. Why does OSHA require employers to store bulk quantities of ammonium nitrate within a bin that is clean and free of contaminants? Give an example of a contaminant, and describe its interaction with ammonium nitrate.

Your total response must be at least 200 words in length.

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