GENERAL CHEMISTRY INTENSIVE

CHEMISTRY 1604

GENERAL CHEMISTRY (INTENSIVE)

ACTUAL

PRACTICE EXAM

• The emission spectrum of the hydrogen atom possesses a red line at 121.6

nm. In the wave mechanical (Schroedinger, quantum mechanical) model of the hydrogen atom this red line could correspond to

• a 3p to 2s electron transition
• a 3s to 1p electron transition
• a 3s to 1s electron transition
• a 2s to 1p electron transition
• a 2p to 1s electron transition

• An X-ray photon has a wavelength of 0.20 nm. What is the

energy per mole of photons of such X-Rays?

• 6.0 x 108 J mol-1
• 9.9 x 10-16 J mol-1
• 6.63 x 10-34 J mol-1
• 1.2 x 1024 J mol-1
• none of these

• Rank the following regions of the electromagnetic spectrum in order of

increasing energy: x-rays, radio waves, infrared, ultraviolet.

• x-rays < radio waves < infrared < ultraviolet
• ultraviolet < infrared < radio waves < x-rays
• x-rays < ultraviolet < infrared < radio waves
• radio waves < infrared < ultraviolet < x-rays
• None of these rankings is correct.

• What is the energy of a photon of light having a wavelength of 892.3 nm?
• 5.912x10

-31 J

• 2.226x10

-28 J

• 1.773x10

-22 J

• 2.226x10

-19 J

• none of these

• Consider the photoelectric effect in nickel. When UV light of wavelength 131

nm impinges upon a clean nickel surface in vacuum, electrons having a kinetic energy of 7.04 x10 -19 J are ejected from the surface. Calculate the longest wavelength of light which will eject electrons from the surface of nickel.

• 895 nm
• 282 nm
• 244 nm
• 110 nm

• The ionization energy for a hydrogen atom in its ground state is 13.6 eV.

Hence the ionization energy for a ground-state He + ion is

• 6.8 eV
• 13.6 eV
• 27.2 eV
• 54.4 eV
• 109 eV

• The energy of a one-electron atom depends upon
• n
• l
• m
• all of these
• none of these

a