Unit 6 Practice Quiz
1.
BrCl5
NH3
BF3
BeCl2
a. Draw a
Lewis
structure for
each
b. Identify the
basic bond
angle(s) for
this geometry
c. Identify the
molecular
geometry of
each molecule
d. Identify
the overall
molecule as
polar or
non-polar
e. State
hybridization
of central
atom under
Valence Bond
Theory
f. Write the electron configuration for the Br atom of BrCl5
1s
2s
2p
3s
3p
4s
3d
g. Write the complete set of quantum numbers for electron circled in (f)
n=
; l=
; m l=
; ms =
4p
h. Give the formal charges for all the atoms in BrCl5 and explain what these charges
mean about the accuracy of your Lewis structure
2.
Consider a yellow light with  = 550 nm (1 nm = 1 x 10-9 m).
a. Determine the frequency of this light.
b. Consider a second light. This light is blue with  = 425 nm. Qualitatively compare
the energies of one photon of these lights (i.e. their magnitudes).
c. Determine the kinetic energy of an electron ejected (if one is) when:
i. a photon from the yellow light shines on a metal whose atoms require 3.50 x 10-19
J of energy to remove an electron.
ii. a photon from the blue light shines on a metal whose atoms require 3.50 x 10-19 J
of energy to remove an electron.
d. Determine the energy of one mole of the photons of the blue light.