Name Section Experiment 12 Advance Study Assignment: The Alkaline Earths and the Halogens 1. As pure elements, all of the halogens are diatomic molecular species. Their melting points are: F2, 34 K Cl2, 172 K; Br2, 266 K; and I, 387 K. Using the Periodic Table, predict as best you can the molecular formula of elemental astatine, At, the only radioactive element in this family. Also predict whether it will be a solid, liquid, or gas at room temperature. Elemental formula: Phase at room temperature: 2. Substances A2, B2, and C2 can all act as oxidizing agents. In solution, A2 is green, B2 is yellow, and C2 is red. In the reactions in which they participate, they are reduced to A, B, and C ions, all of which are colorless. When a solution of C2 is mixed with one containing B ions, the color changes from red to yellow. Which species is oxidized? Which is reduced? When a solution of C, is mixed with one containing A ions, the color remains red. Is C2 a better oxidizing agent than A2? Is C2 a better oxidizing agent than B2? Arrange A2, B2, and C2 in order of increasing strength as an oxidizing agent. strongest oxidizing agent weakest oxidizing agent V

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Name
Section
Experiment 12
Advance Study Assignment: The Alkaline Earths and the Halogens
1. As
pure elements, all of the halogens are diatomic molecular species. Their melting points are: F2, 34 K
Cl2, 172 K; Br2, 266 K; and I, 387 K. Using the Periodic Table, predict as best you can the molecular
formula of elemental astatine, At, the only radioactive element in this family. Also predict whether it will
be a solid, liquid, or gas at room temperature.
Elemental formula:
Phase at room temperature:
2. Substances A2, B2, and C2 can all act as oxidizing agents. In solution, A2 is green, B2 is yellow, and C2 is red.
In the reactions in which they participate, they are reduced to A, B, and C ions, all of which are colorless.
When a solution of C2 is mixed with one containing B ions, the color changes from red to yellow.
Which species is oxidized?
Which is reduced?
When a solution of C, is mixed with one containing A ions, the color remains red.
Is C2 a better oxidizing agent than A2?
Is C2 a better oxidizing agent than B2?
Arrange A2, B2, and C2 in order of increasing strength as an oxidizing agent.
strongest oxidizing agent
weakest oxidizing agent
V

Image Transcription

Name Section Experiment 12 Advance Study Assignment: The Alkaline Earths and the Halogens 1. As pure elements, all of the halogens are diatomic molecular species. Their melting points are: F2, 34 K Cl2, 172 K; Br2, 266 K; and I, 387 K. Using the Periodic Table, predict as best you can the molecular formula of elemental astatine, At, the only radioactive element in this family. Also predict whether it will be a solid, liquid, or gas at room temperature. Elemental formula: Phase at room temperature: 2. Substances A2, B2, and C2 can all act as oxidizing agents. In solution, A2 is green, B2 is yellow, and C2 is red. In the reactions in which they participate, they are reduced to A, B, and C ions, all of which are colorless. When a solution of C2 is mixed with one containing B ions, the color changes from red to yellow. Which species is oxidized? Which is reduced? When a solution of C, is mixed with one containing A ions, the color remains red. Is C2 a better oxidizing agent than A2? Is C2 a better oxidizing agent than B2? Arrange A2, B2, and C2 in order of increasing strength as an oxidizing agent. strongest oxidizing agent weakest oxidizing agent V

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