Worksheet :Ch 7 ; Obj. 1-20Date

Worksheet :Ch 7 ; Obj. 1-20Date

AP ChemistryName :

Worksheet :Ch 7 ; Obj. 1-20Date :

  1. _____ (T/F) Light with a wavelength of 770 nm has a greater frequency than light with a wavelength of 340 nm.
  2. _____ (T/F) Atoms can absorb or release any amount of energy.
  3. _____ (T/F) Photons are quantized.
  4. _____ (T/F) Photons only exhibit a wave nature (do not exhibit a particle nature).
  5. _____ (T/F) The Bohr model of the atom worked for all types of atoms, including polyelectronic atoms.
  6. _____ (T/F) Wavelengths absorbed and emitted from atoms can only come in whole numbers.
  7. _____ (T/F) Orbitals are specific wave functions.
  8. _____ (T/F) The more we know about the momentum of an electron, the better we can determine its position.
  9. _____ (T/F) Nodal surfaces are areas of atoms which have a high probability of containing electrons.
  10. _____ (T/F) The 2s electrons have a greater penetration, and so are said to have a lower energy than the 2p electrons.
  11. The laser in an audio compact disc player uses light with a wavelength of 7.80 x 102 nm. Calculate the frequency of this light.
  1. Microwave radiation has a wavelength on the order of 1.0 cm.Calculate the frequency and the energy of a single photon of this radiation. Calculate the energy of an Avogadro's number of photons (called an einstein) of this radiation.
  1. The work function of an element is the energy required to remove an electron from the surface of the solid element. The work function for lithium is 279.7 kJ/mol (that is, it takes 279.7 kJ of energy to remove one mole of electrons from one mole of Li atoms on the surface of Li metal). What is the maximum wavelength of light that can remove an electron from an atom on the surface of lithium metal?
  1. It takes 7.21 X 10-19 J of energy to remove an electron from an iron atom. What is the maximum wavelength of light that can do this?
  1. Calculate the de Broglie wavelength for each of the following.

a. A proton with a velocity 5.0% of the speed of light

b. A 5.2-oz baseball with a velocity of 100.8 mi/h

  1. Calculate the de Broglie wavelength of an electron moving with a velocity that is 1.0 X 10-3 times the speed of light.
  1. Calculate the wavelength of light emitted when each of the following transitions occur in the hydrogen atom.
  2. n = 3n = 2
  3. n = 4n = 2
  4. n = 2n=l
  1. Using vertical lines, indicate the transitions from question 17on the energy-level diagram for the hydrogen atom (see Fig. 7.8, p. 285).
  1. Calculate the longest and shortest wavelengths of light emitted by electrons in the hydrogen atom that begin in the n = 6 state and then fall to states with smaller values of n.
  1. Calculate the maximum wavelength of light capable of removing an electron from a hydrogen atom for the energy states characterized by n = 1and n = 2.

Answers : 11. 3.84 x 1014s-1 12. 3.0 x 1010s-1, 2.0 x 10-23 J/photon, 12 J/mol 13. 427.7 nm 14. 276 nm 15a. 2.6 x 10-5 nm 15b. 9.8 x 10-26 nm 16. 2.4 nm 17a. 656.7 nm 17b. 486.4 nm 17c. 121.6 nm 18. see fig. 7.8 (p. 297) 19. 6 5, 7462 nm; 6  1, 93.79 nm 20. n = 1, 91.20 nm; n=2, 364.8 nm

Ws-7-1-20

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