CHEM 103 EXAM 3 QUESTIONS AND
ANSWER WITH COMPLETE
SOLUTIONS {GRADED A+}
Visible light, radio waves, microwave, infrared, ultraviolet, X-rays and Gamma
rays all constitute the electromagnetic spectrum. What similar characteristics do
all of these regions share? -ANSWER ✔✔They are all the transmission of
energy in the form of waves.
Calculate the frequency of gamma ray radiation that has a wavelength of 1.14
x10^-11 m -ANSWER ✔✔2.63 x 10^19
What is the wavelength of a photon that has an energy of 2.36 x 10^-16? -
ANSWER ✔✔0.842 nm
Which of the following statements is (are) true?
1)An atom can be excited to a higher energy level by absorption of light energy.
2)An excited atom can return to a higher energy level by emitting light energy.
3) As the energy increases, the frequency of the radiation decreases. -ANSWER
✔✔1 only.
Which of the following regions of the electromagnetic spectrum has the highest
energy?
1) UV
2) Infrared
3) Xray
4) Visible
5)Radiowaves -ANSWER ✔✔X-rays
, Using Bohr's equation for the energy levels of the electron in the hydrogen atom,
determined the energy of an electron in the n=4 level. -ANSWER ✔✔-1.36 x
10^-19 J
If an electron in a hydrogen atom in the n=3 energy level is relaxed to the n=2
energy level, energy is.... -ANSWER ✔✔released
Which one of the following sets of quantum numbers is allowed?
A) n=2, l=1, ml=+1/2, ms=-1/2
B) n=3, l=2, ml=+1, ms=+1
C) n=4 l=1, ml=0, ms=-1/2
D) n=4, l=3, ml=-1, ms=0 -ANSWER ✔✔C
Which of the following is a correct set of quantum numbers for an electron in a
3s orbital?
A)N=3, l=0, ml=-1
B)n=3, l=0, ml=0
C)n=3, l=2, ml=-2 -ANSWER ✔✔B
The complete spdf electron configuration of Tin (Sn) is -ANSWER
✔✔1s22s22p63s23p64s23d104p65s24d105p2
Which of the following elements has three unpaired electrons in p orbitals?
A)Ba
B)Ga
C) V
D) Bi
E) Na -ANSWER ✔✔Bi
ANSWER WITH COMPLETE
SOLUTIONS {GRADED A+}
Visible light, radio waves, microwave, infrared, ultraviolet, X-rays and Gamma
rays all constitute the electromagnetic spectrum. What similar characteristics do
all of these regions share? -ANSWER ✔✔They are all the transmission of
energy in the form of waves.
Calculate the frequency of gamma ray radiation that has a wavelength of 1.14
x10^-11 m -ANSWER ✔✔2.63 x 10^19
What is the wavelength of a photon that has an energy of 2.36 x 10^-16? -
ANSWER ✔✔0.842 nm
Which of the following statements is (are) true?
1)An atom can be excited to a higher energy level by absorption of light energy.
2)An excited atom can return to a higher energy level by emitting light energy.
3) As the energy increases, the frequency of the radiation decreases. -ANSWER
✔✔1 only.
Which of the following regions of the electromagnetic spectrum has the highest
energy?
1) UV
2) Infrared
3) Xray
4) Visible
5)Radiowaves -ANSWER ✔✔X-rays
, Using Bohr's equation for the energy levels of the electron in the hydrogen atom,
determined the energy of an electron in the n=4 level. -ANSWER ✔✔-1.36 x
10^-19 J
If an electron in a hydrogen atom in the n=3 energy level is relaxed to the n=2
energy level, energy is.... -ANSWER ✔✔released
Which one of the following sets of quantum numbers is allowed?
A) n=2, l=1, ml=+1/2, ms=-1/2
B) n=3, l=2, ml=+1, ms=+1
C) n=4 l=1, ml=0, ms=-1/2
D) n=4, l=3, ml=-1, ms=0 -ANSWER ✔✔C
Which of the following is a correct set of quantum numbers for an electron in a
3s orbital?
A)N=3, l=0, ml=-1
B)n=3, l=0, ml=0
C)n=3, l=2, ml=-2 -ANSWER ✔✔B
The complete spdf electron configuration of Tin (Sn) is -ANSWER
✔✔1s22s22p63s23p64s23d104p65s24d105p2
Which of the following elements has three unpaired electrons in p orbitals?
A)Ba
B)Ga
C) V
D) Bi
E) Na -ANSWER ✔✔Bi
