Question 1

Excited hydrogen atoms radiate energy in the

Accepted Answer

A)  infrared region only. 
B)  visible region only. 
C)  ultraviolet region only. 
D)  visible and ultraviolet regions only. 
E)  infrared, visible, and ultraviolet regions. 
A)  infrared region only. 
B)  visible region only. 
C)  ultraviolet region only. 
D)  visible and ultraviolet regions only. 
E)  infrared, visible, and ultraviolet regions.

Question 2

In the Rydberg equation, for a fixed value of n1, the longest wavelength line has n2 = F1F1F1S1F1F1F10.

Accepted Answer

A) True 
 B)False

Question 3

What type of spectrum, if any, would be produced if the light radiated by a heated atomic gas were to be dispersed through a prism?

Accepted Answer

A)  a continuous band of color 
B)  a continuous band of color with some dark lines (missing wavelengths) 
C)  only blue light 
D)  only red light 
E)  discrete lines of different colors 
A)  a continuous band of color 
B)  a continuous band of color with some dark lines (missing wavelengths) 
C)  only blue light 
D)  only red light 
E)  discrete lines of different colors

Question 4

An infrared wave has a wavelength of 6.5 × 10-4 cm. What is this distance in angstroms, Å?

Accepted Answer

A)  6.5 × 10-4 Å 
B)  2.2 × 10-4 Å 
C)  4.6 × 103 Å 
D)  6.5 × 104 Å 
E)  6.5 × 106 Å 
A)  6.5 × 10-4 Å 
B)  2.2 × 10-4 Å 
C)  4.6 × 103 Å 
D)  6.5 × 104 Å 
E)  6.5 × 106 Å

Question 5

Use the Rydberg equation to calculate the wavelength, in nm, of the least energetic (longest wavelength) line in the visible series (n1 = 2) of the spectrum of atomic hydrogen.

Accepted Answer

Question 6

In not more than three lines for each answer, briefly outline one important scientific contribution of each of the following:
a. Planck
b. de Broglie
c. Heisenberg

Accepted Answer

a. Planck is responsible for first propo

Question 7

Other factors being constant, a heavy object will have a longer de Broglie wavelength than a light object.

Accepted Answer

A) True 
 B)False

Question 8

Which of the following frequencies of electromagnetic radiation has the shortest wavelength?

Accepted Answer

A)  1 kilohertz 
B)  1 terahertz 
C)  1 dekahertz 
D)  1 gigahertz 
E)  1 megahertz 
A)  1 kilohertz 
B)  1 terahertz 
C)  1 dekahertz 
D)  1 gigahertz 
E)  1 megahertz

Question 9

The energy of a photon is directly proportional to the wavelength of the radiation.

Accepted Answer

A) True 
 B)False

Question 10

Contact lenses can focus light due to the ____________ of the waves.

Accepted Answer

A)  diffraction 
B)  reflection 
C)  refraction 
D)  dispersion 
E)  interference 
A)  diffraction 
B)  reflection 
C)  refraction 
D)  dispersion 
E)  interference

Question 11

Which of the following is a correct set of quantum numbers for an electron in a 3d orbital?

Accepted Answer

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

Question 12

According to the Heisenberg uncertainty principle, if the uncertainty in the speed of an electron is 3.5 × 103 m/s, the uncertainty in its position (in m) is at least

Accepted Answer

A)  1.7 × 10-8 m. 
B)  6.6 × 10-8 m. 
C)  17 m. 
D)  66 m. 
E)  none of the above. 
A)  1.7 × 10-8 m. 
B)  6.6 × 10-8 m. 
C)  17 m. 
D)  66 m. 
E)  none of the above.

Question 13

According to the Rydberg equation, the longest wavelength (in nm) in the series of H-atom lines with n1 = 3 is

Accepted Answer

A)  1875 nm. 
B)  1458 nm. 
C)  820. nm. 
D)  656 nm. 
E)  365 nm. 
A)  1875 nm. 
B)  1458 nm. 
C)  820. nm. 
D)  656 nm. 
E)  365 nm.

Question 14

Select the arrangement of electromagnetic radiation which starts with the lowest energy and increases to greatest energy.

Accepted Answer

A)  radio, infrared, ultraviolet, gamma rays 
B)  radio, ultraviolet, infrared, gamma rays 
C)  gamma rays, infrared, radio, ultraviolet 
D)  gamma rays, ultraviolet, infrared, radio 
E)  infrared, ultraviolet, radio, gamma rays 
A)  radio, infrared, ultraviolet, gamma rays 
B)  radio, ultraviolet, infrared, gamma rays 
C)  gamma rays, infrared, radio, ultraviolet 
D)  gamma rays, ultraviolet, infrared, radio 
E)  infrared, ultraviolet, radio, gamma rays

Question 15

According to the Bohr theory of the hydrogen atom, the minimum energy (in J) needed to ionize a hydrogen atom from the n = 2 state is

Accepted Answer

A)  2.18 × 10-18 J. 
B)  1.64 × 10-18 J. 
C)  5.45 × 10-19 J. 
D)  3.03 × 10-19 J. 
E)  none of the above. 
A)  2.18 × 10-18 J. 
B)  1.64 × 10-18 J. 
C)  5.45 × 10-19 J. 
D)  3.03 × 10-19 J. 
E)  none of the above.

Question 16

Continuous spectra are characteristic of molecules in the gas phase.

Accepted Answer

A) True 
 B)False

Question 17

Which scientist first proposed that the electron in the hydrogen atom can have only certain energies?

Accepted Answer

A)  Planck 
B)  Einstein 
C)  Bohr 
D)  Rydberg 
E)  Heisenberg 
A)  Planck 
B)  Einstein 
C)  Bohr 
D)  Rydberg 
E)  Heisenberg

Question 18

A wave function for an electron is called an atomic orbital.

Accepted Answer

A) True 
 B)False

Question 19

Line spectra are characteristic of atoms in the gas phase.

Accepted Answer

A) True 
 B)False

Question 20

The orientation in space of an atomic orbital is associated with

Accepted Answer

A)  the principal quantum number (n). 
B)  the angular momentum quantum number (l). 
C)  the magnetic quantum number (ml). 
D)  the spin quantum number (ms). 
E)  none of the above. 
A)  the principal quantum number (n). 
B)  the angular momentum quantum number (l). 
C)  the magnetic quantum number (ml). 
D)  the spin quantum number (ms). 
E)  none of the above.

Exam 7: Quantum Theory and Atomic Structure

Excited hydrogen atoms radiate energy in the

In the Rydberg equation, for a fixed value of n1, the longest wavelength line has n2 = .

What type of spectrum, if any, would be produced if the light radiated by a heated atomic gas were to be dispersed through a prism?

An infrared wave has a wavelength of 6.5 × 10-4 cm. What is this distance in angstroms, Å?

Use the Rydberg equation to calculate the wavelength, in nm, of the least energetic (longest wavelength) line in the visible series (n1 = 2) of the spectrum of atomic hydrogen.

In not more than three lines for each answer, briefly outline one important scientific contribution of each of the following: a. Planck b. de Broglie c. Heisenberg

Other factors being constant, a heavy object will have a longer de Broglie wavelength than a light object.

Which of the following frequencies of electromagnetic radiation has the shortest wavelength?

The energy of a photon is directly proportional to the wavelength of the radiation.

Contact lenses can focus light due to the ____________ of the waves.

Which of the following is a correct set of quantum numbers for an electron in a 3d orbital?

According to the Heisenberg uncertainty principle, if the uncertainty in the speed of an electron is 3.5 × 103 m/s, the uncertainty in its position (in m) is at least

According to the Rydberg equation, the longest wavelength (in nm) in the series of H-atom lines with n1 = 3 is

Select the arrangement of electromagnetic radiation which starts with the lowest energy and increases to greatest energy.

According to the Bohr theory of the hydrogen atom, the minimum energy (in J) needed to ionize a hydrogen atom from the n = 2 state is

Continuous spectra are characteristic of molecules in the gas phase.

Which scientist first proposed that the electron in the hydrogen atom can have only certain energies?

A wave function for an electron is called an atomic orbital.

Line spectra are characteristic of atoms in the gas phase.

The orientation in space of an atomic orbital is associated with

Keys to the Study of Chemistry

The Components of Matter

Stoichiometry of Formulas and Equations

The Major Classes of Chemical Reactions

Gases and the Kinetic-Molecular Theory

Thermochemistry: Energy Flow and Chemical Change

Electron Configuration and Chemical Periodicity

Models of Chemical Bonding

The Shapes of Molecules

Theories of Covalent Bonding

Intermolecular Forces: Liquids, Solids, and Phase Changes

The Properties of Mixtures: Solutions and Colloids

Periodic Patterns in the Main Group Elements: Bonding, Structure, and Reactivity

Organic Compounds and the Atomic Properties of Carbon

Kinetics: Rates and Mechanisms of Chemical Reactions

Equilibrium: the Extent of Chemical Reactions

Acid-Base Equilibria

Ionic Equilibria in Aqueous Systems

Thermodynamics: Entropy, Free Energy, and the Direction of Chemical Reactions

Electrochemistry: Chemical Change and Electrical Work

The Elements in Nature and Industry

The Transition Elements and Their Coordination Compounds

Nuclear Reactions and Their Applications

Filters

In the Rydberg equation, for a fixed value of n₁, the longest wavelength line has n₂ = .

An infrared wave has a wavelength of 6.5 × 10^-4 cm. What is this distance in angstroms, Å?

Use the Rydberg equation to calculate the wavelength, in nm, of the least energetic (longest wavelength) line in the visible series (n₁ = 2) of the spectrum of atomic hydrogen.

According to the Heisenberg uncertainty principle, if the uncertainty in the speed of an electron is 3.5 × 10³ m/s, the uncertainty in its position (in m) is at least

According to the Rydberg equation, the longest wavelength (in nm) in the series of H-atom lines with n₁ = 3 is