Question

answer 2,3,4 only

1. Substances A, B, and C can all act as oxidizing agents. In solution the neutral substance A is green, B is yellow and C is red. In reactions in which they participate, they are reduced to A^-, B^-, and C^- ions, all of which are colorless.
   1. When a solution of A is mixed with one containing C^- ions, the color changes from green to red.
      1. Write a chemical reaction for this process. Use the reactions on Page 3 as guidelines.

2. Is A or C better at holding on to electrons and is, therefore, a better oxidizing agent ? What physical evidence do you have to support this?

2. When a solution of A is mixed with one containing B^- ions, the color remains green.
   1. Write a chemical reaction for this process.

2. Is A a better oxidizing agent than B? What physical evidence do you have to support this?

3. Arrange A, B, and C in order of increasing strength as oxidizing agents.

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2. A student added the following chemicals to a test tube and observed the color.

Chemicals: An unknown containing one of the anions A^-, B^- or C^- and a solution of C.

Color in hexane: Red.

Does this allow her to identify her unknown? Why or why not?

3. Another student did a similar experiment.

Chemicals: Her unknown and a solution of B.

Color in hexane: Red.

Does this allow her to identify her unknown? Why or why not?

4. A third student did a similar experiment.

Chemicals: His unknown and a solution of A.

Color in hexane: Green.

Does this allow him to identify his unknown? Why or why not?

Answer 1

A Green By Yellow C Red I Colorlen. a) i) Atc i te Green Red =) [Al is a better oxidizing agent than c because it readily acidizes c-toc. Physical evidence & Color change H + B No reaction Green in) SNO). A is not a better oxidizing agent than B. Because it has not oxidized B & Physical evidence & Color no charge. c) CLALB Best oxidizing agent Poor oxidizin agent unknown # i) [NO], cannot identify unknown because C is foor oxidizing agent, cannot oxidize A, B their presence cannot be detected (can be 1) Ċ +B (+37 Red Mes] unknown is c- because oxidation has taken place. Color changed from Yellow to Red. A B + Ť A A No reaction unknown (freen) INO, unknown 6 because A cannot oxidize B. Also can be A .