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Chem 1021_3rd Exam_1021218-UPDATED
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Exam of 8 pages for the course Chem 1021 at Chem 1021 (Chem 1021_3rd Exam_)
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Chem 1021_3rd Exam_1021218MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the
question.
1) On the electromagnetic spectrum, visible light is immediately between two other wavelengths. Name
them.
A) infrared and ultraviolet
B) microwave and x -ray
C) infrared and x -ray
D) radio and microwave
E) gamma ray and
ultraviolet Answer: A
2) Which of the following occur as the energy of a photon increases?
A) the frequency decreases. B) the wavelength increases
C) the wavelength gets shorter. D) the speed
decreases. Answer: C
3) Determine the longest wavelength of light required to remove an electron from a sample of
potassium metal, if the binding energy for an electron in K is 1.76 × 103 kJ/mol. (Planck's
constant h = 6.626 × 10—34 J·s)
A) 113 nm B) 387 nm C) 68.0 nm D) 147 nm E) 885 nm
Answer: C
4) In an experiment searching for the photoelectric effect, an incident beam of green light
produced no ejected electrons from a metal. In order to eject electrons, the experimenter
should
A) increase the brightness of the light. B) decrease the brightness of the light.
C) try yellow light. D) try blue light.
Answer: D
5) It is possible to determine the ionization energy for hydrogen using the Bohr equation. Calculate
the ionization energy for an atom of hydrogen, making the assumption that ionization is the
transition from n = 1 to n = ∞. (Rydberg constant RH = 2.18 × 10—18 J)
A) -2.18 × 10 -18 J
B) -4.59 × 10 -18 J
C) +4.59 × 10 -18 J
D) +4.36 x 10 -18 J
E) +2.18 × 10 -18 J
Answer: E
6) Which of the following quantum numbers describes the shape of an orbital?
A) spin quantum number
B) Schrödinger quantum number
C) magnetic quantum number
D) principal quantum number
E) angular momentum quantum
number Answer: E
7) What value of l is represented by a f orbital?
A) 2 B) 0 C) 3 D) 1
Answer: C
1021218_A
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, 8) What is the maximum number of p orbitals that are possible?
A) 3 B) 9 C) 5 D) 7 E) 1
Answer: A
9) How many electrons are there in a filled 3px orbital?
A) 2 B) 3 C) 4 D) 5 E) 6
Answer: A
10)Give the numbers for ml for a d orbital.
A) 0, 1, 2 B) 1, 2, 3 C) -1, 0, 1 D) -2, -1, 0, 1, 2
Answer: D
11)Which set of quantum numbers cannot occur together to specify an orbital?
A) n = 2, l = 1, ml = -1 B) n = 3, l = 2, ml = -0 C) n = 3, l = 3, ml = 2 D) n = 4, l = 3, ml = 0
Answer: C
12)Which electron transition produces light of the highest frequency in the hydrogen atom?
A) 5p - 1s B) 4p - 1s C) 3p - 1s D) 2p - 1s
Answer: A
13)A major league pitcher throws a 148.8 g baseball at a speed of 92.5 mph (41.4 m/s). What is
the de Broglie wavelength of the baseball in meters? (Planck's constant h = 6.626 × 10—34
J·s and 1 J = 1 kg·m2/s2)
–38 –41 –34 –37 –40
A) 4.81 × 10 B) 4.81 × 10 C) 1.08 × 10 D) 1.08 × 10 E) 1.08 × 10
Answer: C
14)Which orbital is a d orbital?
A) B) C)
D) Answer: D
15)The quantum numbers of the last electron of nickel
could be: A) n = 4, l = 2, ml = 0, ms = 1/2
B) n = 3, l = 1, ml = 0, ms = 1/2
C) n = 3, l = 2, ml = 0, ms = 1/2
D) n = 3, l = 2, ml = 0, ms = 0
E) n = 3, l = 2, ml = 1/2, ms = 1/2
Answer: C
16)No two electrons can have the same four quantum numbers is known as
the
A) Heisenberg uncertainty principle B) Hund's rule
C) Aufbau principle D) Pauli exclusion
principle Answer: D
1021218_A
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