The Alkaline Earths and the Halogens

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Experiment Five – Group Chemistry

The Alkaline Earths and the Halogens: Two Families in the Periodic Table

Prelaboratory Questions

1. All of the common noble gases are monatomic and low-boiling. Their boiling points in °C are: Ne, –245; Ar, –186; Kr, –152; Xe, –107. Using the Periodic Table, predict as best you can the molecular formula and boiling point of radon, the only radioactive element in this family.

_______________________ ____________________°C
Molecular FormulaBoiling Point

1. Substances A, B, and C can all act as oxidizing agents. In solution, A is green, B is red, and C is yellow. In the reactions in which they participate, they are reduced to A-, B-, and C- ions respectively, all of which are colorless. When a solution of A is mixed with one containing B- ions, the color changes from green to red. |Which species is oxidized? | | |Which is reduced? | |

2. When a solution of A is mixed with one containing C- ions, the color remains green. |Is A a better oxidizing agent than B? | | |Is A a better oxidizing agent than C? | |

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

4. You are given an unknown, colorless, solution that may contain only one salt from the following set: NaA, NaB, NaC. In solution each salt dissociates completely into the Na+ ion and the anion A–, B–, or C–, whose properties are given in Problem 2. The Na+ ion is a spectator ion. Given the availability of solutions of A, B, and C, develop a simple procedure for identifying the salt that is present in your unknown. Use the other side of this page.
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