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The Units, The Conversions, and The Sig Figs
Feelin' Light
Atom-tomy
My Chemical Romance
Who Doesn't Love Quantum Mechanics?
100

Which of the following numbers has 3 significant figures?

A. 0.02670
B. 500
C. 1.260
D. 0.300
E. 1.5 E2

D) 0.300

100

Which statement best describes the behavior of light?

A) It behaves only as a particle
B) It behaves only as a wave
C) It behaves only as a quark
D) It exhibits both particle and wave properties
E) It exhibits all of the above behaviors

D) It exhibits both particle and wave properties

100

Which of the following statements is NOT true for protons?


A) The number of protons determine the identity of an element
B) They are found in the nucleus.
C) They have a negative charge.
D) The number of protons is different in every atom
E) Protons contribute to the atomic mass number

C) They have a negative charge

100

What charge do ions of alkaline earth metals commonly have?
A. +1
B. +2
C. -1
D. -2
E. Variable

B. +2

100

What type of orbital is being shown in this picture?
A) s
B) p
C) d
D) f




D) f

200

Which of the following conversion factors are INCORRECT?

A) 1 km = 1000 meters
B) 1 meter = 1 x 109 ng
C) 1 x 10-6 μg = 1 meter
D) 1 km = 1 x 104 dm
E) 3,600 s = 1 hr

C) 1 x 10-6 μg = 1 meter

200

A wave was found to have a frequency of 9.0 x 1015 s-1. Calculate its wavelength.

A. 3.3 x 10-8 nm
B. 3.3 x 10-8 m
C. 3.3 x 108 m
D. 3.3 x 10-9 nm
E. 3.3 x 109 m

c = 2.998 x 108 m · s-1
h = 6.626 x 10-34 J · s

B. 3.3 x 10-8 m

200

Orbitals are often designated a letter or symbol in order to organize their shapes and behaviors. What is the proper order of orbitals for electron distribution?


A) s, p, f, d
B) s, p, d, f
C) n, l, ml, ms
D) n, l, m1, m2
E) d, f, p, s

B) s, p, d, f

200

Which of the following set of species are isoelectronic?

A. F+, Na-
B. Cs+, Cl-
C. N-, O-
D. Ar-, Hf+2
E. O2-, Ne

E. O2-, Ne

200

Which of these electron spin configurations would be correct for the ms quantum number?

A. 1+, 0, 1-
B. 1/2+, 1/2-
C. 1, 2, 3, 4
D. 1+, 1-
E. 0, 1

B. 1/2+, 1/2-

300

Convert 12.5 kilometers per second (km/s) to meters per year (m/yr).

A) 3.94 x 108 m/yr
B) 3.94 x 1012 m/yr
C) 3.94 x 107 m/yr
D) 3.94 x 1011 m/yr
E) 3.94 x 1010 m/yr


D) 3.94 x 1011 meters per year

300

Which transition in a hydrogen atom will cause an emission of the shortest wavelength photon?
A. 𝑛initial = 5 to 𝑛final = 3
B. 𝑛initial = 4 to 𝑛final = 3
C. 𝑛initial = 4 to 𝑛final = 2
D. 𝑛initial = 3 to 𝑛final = 2
E. 𝑛initial = 3 to 𝑛final = 1

E) 𝑛initial = 3 to 𝑛final = 1 

300

What is the correct simplified electron configuration for an atom of As?

A) [Ne] 3s23p6
B) [Xe] 5s25p3
C) [Ne] 3s23p1
D) [Ar] 4s03d104p5
E) [Ar] 4s23d104p3

E) [Ar] 4s23d104p3

300

Select the correct ranking of the following elements from lowest to highest first ionization energy: O, Mg, I, Li.

A. Mg < Li < I < O
B. Li < Mg < O < I
C. Mg < Li < O < I
D. Li < Mg < I < O
E. Mg < Li < I < O

D. Li < Mg < I < O

300

How many electrons in an atom can have the quantum numbers n = 3, l = 2?

A. 4
B. 5
C. 10
D. 12
E. 18

C. 10

400

Humans require an average of 13 mg of iron (Z = 26) daily in order to survive. The density that iron is held in many foods is 1.9 g/mL. Given that, how many mL of iron does a human require daily?

A. 0.0068 mL
B. 0.068 mL
C. 6.8 mL
D. 0.00068 mL
E. 25 mL

A. 0.0068 mL

400

When a green laser was pointed at a metallic surface, an electric current was produced (dislodgement of electrons). When a red light was pointed at the same surface, no current was produced. Which of the following would BEST explain this observation?

A) The red light had a higher frequency than the green light
B) The green light was higher in intensity than the red light
C) The red light was higher in intensity than the green light
D) The green light bypassed the frequency threshold of the material while the red light did not.
E) The red light bypassed the frequency threshold of the material while the green light did not.

D) The green light bypassed the frequency threshold of the material while the red light did not.

400

Which of the following are isotopes of each other?

ElementProtonsNeutronsElectrons
A232423
B242324
C252725
D232422
E242224
 
 
 
 

D. B and E

400

The atomic radius of chlorine (Z = 17) is smaller than the atomic radius of sodium (Z = 11) primarily because chlorine experiences which of the following?

A. A greater effective nuclear charge
B. A higher principal quantum number for its valence electrons
C. Increased electron-electron repulsion in the valence shell
D. More complete shielding of nuclear charge by inner electrons
E. A lower effective nuclear charge 

A. A greater effective nuclear charge

400

Which of the following sets of quantum number configurations represents a valid electron?

A. n = 1, l = 2 ml = 0, ms = 1/2-
B. n = 0 l = 1 ml = 0, ms = 1/2+
C. n = 2, l = 1, ml = -1, ms = 1/2-
D. n = 2, l = -1, ml = 0, ms = 1/2-
E. n = 3, l = 3, ml = 1, ms = 1/2+

C. n = 2, l = 1, ml = -1, ms = 1/2-

500

Convert 4.2 miles to football fields using dimensional analysis with the given conversion factors. You must show your work.

1 Football Field = 91.44 meters
1 meter  = 39.37 inches
1 mile = 16000 decimeters

74 football fields.

500

Blue light has a wavelength of 450. nm.
 a) Convert wavelength to meters.
 b) Calculate the energy of one photon.

c = 2.998 x 108 m · s-1
h = 6.626 x 10-34 J · s

A) 4.50 E-7 m 

B) 4.42 E-19 J

500

Write the simplified boxed orbital configuration for Chromium (Cr, Z = 24).

[Ar] [↑] [↑ ↑ ↑ ↑ ↑]

Don't forget 4s and 3d are near the same energy level as each other.

500

Complete the following table.

Nuclide SymbolAtomic NumberMass NumberNumber of ProtonsNumber of NeutronsNumber of ElectronsCharge
7934Se-2??????


Nuclide SymbolAtomic NumberMass NumberNumber of ProtonsNumber of NeutronsNumber of ElectronsCharge
7934Se-23479344536 (charge 2-)
500

Determine whether the ion Cr³⁺ is paramagnetic or diamagnetic. Justify your answer using its electron configuration.

Paramagnetic with 3 unpaired electrons. Don't forget about the d orbital rule and the removed electrons from the ion.