Question 1

A police radar unit is operating on a frequency of 9.527 gigahertz. What is the wavelength of the radiation being employed?

Accepted Answer

A) 314.9 nm 
B) 314.9 m 
C) 3.149 cm 
D) 314.9 cm 
E) 31.78 m 
A) 314.9 nm 
B) 314.9 m 
C) 3.149 cm 
D) 314.9 cm 
E) 31.78 m

Question 2

Which configuration represents a halogen element?

Accepted Answer

A) [Ar] 4s13d5 
B) [Ar] 4s23d4 
C) [Kr] 5s24d105p5 
D) [Xe] 6s24f 7 
E) [Xe] 6s24f 145d106p4 
A) [Ar] 4s13d5 
B) [Ar] 4s23d4 
C) [Kr] 5s24d105p5 
D) [Xe] 6s24f 7 
E) [Xe] 6s24f 145d106p4

Question 3

Which atom has the smallest radius?

Accepted Answer

A) Ca 
B) Ba 
C) K 
D) Mg 
E) C 
A) Ca 
B) Ba 
C) K 
D) Mg 
E) C

Question 4

The de Broglie relationship provides a link between which two properties of the electron?

Accepted Answer

A) the mass and the charge 
B) the mass and the energy 
C) its energy and its charge 
D) the orbit and its wavelike movements 
E) its wave and particle properties 
A) the mass and the charge 
B) the mass and the energy 
C) its energy and its charge 
D) the orbit and its wavelike movements 
E) its wave and particle properties

Question 5

The following are all ionization energies for beryllium.   How much energy would be needed to remove three electrons from a ground state beryllium atom?

Accepted Answer

The answer of The following are all ionization energies for...

Question 6

What is the energy of one photon of microwave radiation with a wavelength of 0.158 m?

Accepted Answer

A) 1.26 × 10-24 J 
B) 3.14 × 10-26 J 
C) 3.19 × 1025 J 
D) 3.49 × 10-43 J 
E) 7.15 × 1040 J 
A) 1.26 × 10-24 J 
B) 3.14 × 10-26 J 
C) 3.19 × 1025 J 
D) 3.49 × 10-43 J 
E) 7.15 × 1040 J

Question 7

Which statement best describes the d orbitals?

Accepted Answer

A) There are 5 of them: 4 clover-shaped, one dumbbell-shaped with a donut around the center. 
B) There are 5 of them: 5 clover-shaped. 
C) There are 3 of them: 3 clover-shaped. 
D) There are 3 of them: 3 dumbbell-shaped. 
E) There are 7 of them: 6 clover-shaped, one dumbbell-shaped with a donut around the center. 
A) There are 5 of them: 4 clover-shaped, one dumbbell-shaped with a donut around the center. 
B) There are 5 of them: 5 clover-shaped. 
C) There are 3 of them: 3 clover-shaped. 
D) There are 3 of them: 3 dumbbell-shaped. 
E) There are 7 of them: 6 clover-shaped, one dumbbell-shaped with a donut around the center.

Question 8

What is the energy of one mole of photons of visible light having a wavelength of 486.1 nm?

Accepted Answer

A) 12.4 kJ 
B) 2.46 × 10-4 J 
C) 2.46 × 105 J 
D) 6.17 × 1014 J 
E) 8.776.2 × 1025 J 
A) 12.4 kJ 
B) 2.46 × 10-4 J 
C) 2.46 × 105 J 
D) 6.17 × 1014 J 
E) 8.776.2 × 1025 J

Question 9

Calculate the wavelength, in nanometers, of light emitted by a hydrogen atom when the electron falls from an n = 7 energy level to an n = 4 energy level. Recall that the quantized energies of the levels in the hydrogen atom are given by:

Accepted Answer

A) 4.45 × 10-20 nm 
B) 8.51 × 102 nm 
C) 2.17 × 103 nm 
D) 1.38 × 1014 nm 
E) 2.16 × 103 nm 
A) 4.45 × 10-20 nm 
B) 8.51 × 102 nm 
C) 2.17 × 103 nm 
D) 1.38 × 1014 nm 
E) 2.16 × 103 nm

Question 10

A possible set of quantum numbers for an electron in the partially filled subshell in a vanadium atom in its ground state configuration would be

Accepted Answer

The answer of A possible set of quantum numbers for...

Question 11

The diffraction of electrons is the principle on which the electron microscope is based.

Accepted Answer

A) True 
 B)False

Question 12

There are several possible arrangements of electrons when you try to place 7 electrons in a 3d subshell. To determine the correct distribution for the ground state we are guided by

Accepted Answer

A) Avogadro's principle. 
B) Hund's Rule. 
C) the Pauli principle. 
D) the wave particle duality principle. 
E) the uncertainty principle. 
A) Avogadro's principle. 
B) Hund's Rule. 
C) the Pauli principle. 
D) the wave particle duality principle. 
E) the uncertainty principle.

Question 13

Kevin is working on a summer project in which he is using a tunable dye laser. At first, he used radiation on a wavelength of 488.5 nm. After two weeks, his research advisor told him to increase the energy by another 55.0 kJ per mole and repeat the radiation effect tests. What wavelength should he then use? (Use c = 2.998 × 108 m/s)Hint: Account for the added energy in your formula.

Accepted Answer

Question 14

A carbon atom has ________ valence electrons.

Accepted Answer

The answer of A carbon atom has ________ valence electrons....

Question 15

Which statement is false?

Accepted Answer

A) The probability of finding an electron at a given point in space is equal to the square of the amplitude of the electron wave. 
B) The electron density in an orbital ends abruptly at some imaginary circumference enclosing 90% of the electron density. 
C) The p orbitals have the electron density equally distributed in two regions on opposite sides of the nucleus. 
D) All s orbitals are spherical in shape. 
E) Within the 2s orbital, there are certain places where the electron density drops to zero. 
A) The probability of finding an electron at a given point in space is equal to the square of the amplitude of the electron wave. 
B) The electron density in an orbital ends abruptly at some imaginary circumference enclosing 90% of the electron density. 
C) The p orbitals have the electron density equally distributed in two regions on opposite sides of the nucleus. 
D) All s orbitals are spherical in shape. 
E) Within the 2s orbital, there are certain places where the electron density drops to zero.

Question 16

How many unpaired electrons are in the ground state electron configuration for an iron atom?

Accepted Answer

The answer of How many unpaired electrons are in the...

Question 17

The ground state electron configuration, using abbreviated electron configuration, for arsenic is ________.

Accepted Answer

The answer of The ground state electron configuration, using abbreviated...

Question 18

Which statement is true of Bohr's equation, E = -b/n2?

Accepted Answer

A) E represents the energy of the proton. 
B) b represents the energy of an excited electron. 
C) The negative sign in the equation suggests that any electron with a finite value of n has a lower energy than an unbound electron. 
D) The possible values of n are any real number 
E) Each orbit is identified by its unique values for b and n. 
A) E represents the energy of the proton. 
B) b represents the energy of an excited electron. 
C) The negative sign in the equation suggests that any electron with a finite value of n has a lower energy than an unbound electron. 
D) The possible values of n are any real number 
E) Each orbit is identified by its unique values for b and n.

Question 19

The increase in atomic radius as one progresses within the alkali metal family from element Z = 3 to Z = 87 in the periodic table can be attributed to

Accepted Answer

A) the increase in the principal quantum number of the outermost occupied orbital in the atom. 
B) the decrease in the principal quantum number of the outermost occupied orbital in the atom. 
C) the increase in the effective nuclear charge being experienced by the electron(s)in the outermost occupied orbital in the atom. 
D) the decrease in the effective nuclear charge being experienced by the electron(s)in the outermost occupied orbital in the atom. 
E) the increase in the secondary quantum number of the outermost occupied orbital in the atom. 
A) the increase in the principal quantum number of the outermost occupied orbital in the atom. 
B) the decrease in the principal quantum number of the outermost occupied orbital in the atom. 
C) the increase in the effective nuclear charge being experienced by the electron(s)in the outermost occupied orbital in the atom. 
D) the decrease in the effective nuclear charge being experienced by the electron(s)in the outermost occupied orbital in the atom. 
E) the increase in the secondary quantum number of the outermost occupied orbital in the atom.

Question 20

The directions of maximum electron density of the three p orbitals are mutually perpendicular to each other.

Accepted Answer

A) True 
 B)False

Exam 8: The Quantum Mechanical Atom

A police radar unit is operating on a frequency of 9.527 gigahertz. What is the wavelength of the radiation being employed?

Which configuration represents a halogen element?

Which atom has the smallest radius?

The de Broglie relationship provides a link between which two properties of the electron?

The following are all ionization energies for beryllium. How much energy would be needed to remove three electrons from a ground state beryllium atom?

What is the energy of one photon of microwave radiation with a wavelength of 0.158 m?

Which statement best describes the d orbitals?

What is the energy of one mole of photons of visible light having a wavelength of 486.1 nm?

Calculate the wavelength, in nanometers, of light emitted by a hydrogen atom when the electron falls from an n = 7 energy level to an n = 4 energy level. Recall that the quantized energies of the levels in the hydrogen atom are given by:

A possible set of quantum numbers for an electron in the partially filled subshell in a vanadium atom in its ground state configuration would be

The diffraction of electrons is the principle on which the electron microscope is based.

There are several possible arrangements of electrons when you try to place 7 electrons in a 3d subshell. To determine the correct distribution for the ground state we are guided by

A carbon atom has ________ valence electrons.

Which statement is false?

How many unpaired electrons are in the ground state electron configuration for an iron atom?

The ground state electron configuration, using abbreviated electron configuration, for arsenic is ________.

Which statement is true of Bohr's equation, E = -b/n2?

The increase in atomic radius as one progresses within the alkali metal family from element Z = 3 to Z = 87 in the periodic table can be attributed to

The directions of maximum electron density of the three p orbitals are mutually perpendicular to each other.

A Very Brief History of Chemistry

Scientific Measurements

Elements, Compounds, and the Periodic Table

The Mole and Stoichiometry

Molecular View of Reactions in Aqueous Solutions

Oxidation-Reduction Reactions

Energy and Chemical Change

The Basics of Chemical Bonding

Theories of Bonding and Structure

Properties of Gases

Intermolecular Attractions and the Properties of Liquids and Solids

Mixtures at the Molecular Level: Properties of Solutions

Chemical Kinetics

Chemical Equilibrium

Acids and Bases, a Molecular Look

Acid-Base Equilibria in Aqueous Solutions

Solubility and Simultaneous Equilibria

Thermodynamics

Electrochemistry

Nuclear Reactions and Their Role in Chemistry

Metal Complexes

Organic Compounds, Polymers, and Biochemicals

Filters

Which statement is true of Bohr's equation, E = -b/n²?