5.E: Exercises
- Page ID
- 64686
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| 1. | Estimate the wavelength of the photon which is emitted when a 3p electron falls to a vacancy in the 1s orbital in a chlorine ion. The energies of the 1s and 3p orbitals in chlorine are -2.854 ´ 103 ev and -13.77 ev respectively. | ||
| 2. | In his investigation of the X-ray spectra of the elements, Moseley found that the frequencies of the lines of shortest wavelength could be expressed as a function of the atomic number Z as | ||
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| where a and s are constants. Account for the general form of the relationship. What is the significance of the factor s? | |||
| 3. | (a) | On the basis of your knowledge of the electronic structure of the elements arrange the following substances in the order of their increasing ability to act as oxidizing agents. He+, Cl, P, Na, F- | |
| (b) | Arrange the following substances in the order of their increasing ability to act as reducing agents. Cs, Li, C, S, Cl | ||
| 4. | Rationalize the following observations on the basis of the electronic structures of the halogen atoms and their ions. Iodide ions can be oxidized to elemental iodine by molecular oxygen 4HI + O2 ® 2Li + 2H20 but the corresponding reaction does not occur with HCl HCl + O2 ® no reaction | ||
| 5. | Account for the fact that the second ionization potential for oxygen is greater than that for fluorine. (I2 for 0 is 35.15 ev and I2 for F is 34.98 ev.) | ||
| 6. | Which atom or ion in the following pairs has the highest ionization potential?
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| 7. | Of the following substances: F2, F-, I2, I- | ||
| (a) | Which is the best oxidizing agent? | ||
| (b) | Which is the best reducing agent? | ||
| (c) | Write one chemical equation for a reaction which will illustrate your answers to parts (a) and (b). | ||