CHEM 1021 EXAM |3RD EXAM Q&A
MULTIPLE CHOICE.
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
...
chem 1021 exam |3rd exam qampa multiple choice 1 on the electromagnetic spectrum
visible light is immediately between two other wavelengths name them a infrared and ultraviolet b microwave a
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CHEM 1021 EXAM |3RD EXAM Q&A
MULTIPLE CHOICE.
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
1021218_A_1
, number Answer: E
7) What value of l is represented by a f orbital?
A) 2 B) 0 C) 3 D) 1
Answer: C
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)
A) 4.81 × 10–38 B) 4.81 × 10–41 C) 1.08 × 10–34 D) 1.08 × 10–37 E) 1.08 × 10–40
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
1021218_A_2
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