Quantum Mechanics (Ch 12)

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Presentation transcript:

Quantum Mechanics (Ch 12) 1. One type of electromagnetic radiation has a frequency of 200 MHz, another has a wavelength of 225 nm, and another type has photons with energy equal to 4.20 x 10-19 J. Convert each to wavelength (in meters) and put these in order of increasing energy per photon.

Quantum Mechanics (Ch 12) 2. The ionization energy of gold is 890.1 kJ/mol (the amount of energy needed to remove a mole of electrons from atoms on the surface of gold metal). What is the maximum wavelength of light that can remove an electron from a gold atom?

Quantum Mechanics (Ch 12) 3. It takes 208.4 kJ to remove 1 mole of electrons from atoms on the surface of rubidium metal. If rubidium is irradiated with 254 nm light, what is the maximum kinetic energy the released electrons can have?

Quantum Mechanics (Ch 12) 4. Calculate the wavelength of light associated with the following transitions in a hydrogen atom: a. n =2  n =3 b. n = 4  n=1 c. removing an e- from the second excited state

Quantum Mechanics (Ch 12) 5. Calculate the ionization energy (in kJ/mol) for ground state He+

Quantum Mechanics (Ch 12) 6. The figure below represents part of the emission spectrum for a one-electron ion in the gas phase. All of the lines result from electronic transitions from excited states to the n = 3 state. If the wavelength of line B is 142.5 nm, calculate the wavelength of line A.

Quantum Mechanics (Ch 12) 7. Calculate the deBroglie wavelength of the following: a. an electron with a velocity 20 % the speed of light (me = 9.1 x 10-31 kg) b. a 10.0 g bullet moving at 800 m/s

Quantum Mechanics (Ch 12) 8. Fill in the table: Quantum # Name Meaning Possible values n l ml ms

Quantum Mechanics (Ch 12) 9. Which of the following are incorrect? Why? 2s 3f 8p 5f 2d 2p 1d

Quantum Mechanics (Ch 12) 10. How many orbitals can have the following designation? What about electrons? a. n = 2 b. 3d c. n = 4, l = 1, ml = 0 d. 5fxyz

Quantum Mechanics (Ch 12) 11. Write electron configurations for: a. O b. Ne c. Ca d. Br e. Cr f. Cu g. Cf

Quantum Mechanics (Ch 12) 12. How many unpaired electrons are present in each of the following? a. P b. Mg2+ c. Fe d. S2- e. Al

Quantum Mechanics (Ch 12) 13. Which of the following correspond to an excited state? If so,write the correct ground state configuration. Identify the element in each case. a. 1s22s22p53s1 b. [Ne]3s23p4 c. [Ar]4s13d5 d.[Kr]5s24d85p1 e. [Ar]4s23d104p3

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