Question 1

For which of the following transitions would a hydrogen atom emit the lowest energy photon?

Accepted Answer

A)  n = 4 to n = 5 
B)  n = 5 to n = 2 
C)  n = 4 to n = 3 
D)  n = 3 to n = 1 
E)  n = 3 to n = 2 
A)  n = 4 to n = 5 
B)  n = 5 to n = 2 
C)  n = 4 to n = 3 
D)  n = 3 to n = 1 
E)  n = 3 to n = 2

Question 2

Erwin Schrödinger developed a model for the behavior of electrons in atoms that is known as quantum mechanics.Which of the following statements concerning this model is/are CORRECT?
1)The energy of an electron is quantized.
2)The energy of an electron is equal to its mass multiplied by the square of its velocity.
3)Electrons travel in circular orbits around a nucleus.

Accepted Answer

A)  1 only 
B)  2 only 
C)  3 only 
D)  1 and 2 
E)  1,2,and 3 
A)  1 only 
B)  2 only 
C)  3 only 
D)  1 and 2 
E)  1,2,and 3

Question 3

The energy required to break one mole of hydrogen-hydrogen bonds in H2 is 436 kJ/mol.What is the longest wavelength of light capable of breaking a single H-H bond?

Accepted Answer

A)  0.474 nm 
B)  119 nm 
C)  132 nm 
D)  274 nm 
E)  474 nm 
A)  0.474 nm 
B)  119 nm 
C)  132 nm 
D)  274 nm 
E)  474 nm

Question 4

The Bohr model predicts that the energy of an atom's electron is ________,meaning that the electron can only occupy orbitals of specific energies.

Accepted Answer

The answer of The Bohr model predicts that the energy...

Question 5

Which of the following properties is associated with the value of the   quantum number?

Accepted Answer

A)  the shape of an orbital 
B)  the size of an orbital 
C)  the number of electrons in an orbital 
D)  the energy of an orbital 
E)  the orientation in space of an orbital 
A)  the shape of an orbital 
B)  the size of an orbital 
C)  the number of electrons in an orbital 
D)  the energy of an orbital 
E)  the orientation in space of an orbital

Question 6

Occupied states or energy levels in the hydrogen atom with n > 1 are called _____ states.

Accepted Answer

The answer of Occupied states or energy levels in the...

Question 7

A point in a standing wave that has zero amplitude is called a(n)________.

Accepted Answer

The answer of A point in a standing wave that...

Question 8

How many values are there for the magnetic quantum number (   )when the value of the angular momentum quantum number (   )is 4?

Accepted Answer

A)  14 
B)  9 
C)  2 
D)  4 
E)  15 
A)  14 
B)  9 
C)  2 
D)  4 
E)  15

Question 9

A 4p orbital has ?

Accepted Answer

A)  3 planar nodes and 1 spherical node. 
B)  0 planar nodes and 2 spherical nodes. 
C)  1 planar node and 2 spherical nodes. 
D)  1 planar node and 0 spherical nodes. 
E)  2 planar nodes and 3 spherical nodes. 
A)  3 planar nodes and 1 spherical node. 
B)  0 planar nodes and 2 spherical nodes. 
C)  1 planar node and 2 spherical nodes. 
D)  1 planar node and 0 spherical nodes. 
E)  2 planar nodes and 3 spherical nodes.

Question 10

How many p orbitals are in the n = 3 shell?

Accepted Answer

A)  1 
B)  6 
C)  0 
D)  5 
E)  3 
A)  1 
B)  6 
C)  0 
D)  5 
E)  3

Question 11

A red laser pointer emits light at a wavelength of 488 nm.If the laser emits 7.5 $\times$ 10-4 J of energy per second in the form of visible radiation,how many photons per second are emitted from the laser?

Accepted Answer

A)  4.1 $\times$ 10-19 photons/sec 
B)  5.4 $\times$ 10-16 photons/sec 
C)  8.9 $\times$ 1014 photons/sec 
D)  1.8 $\times$ 1015 photons/sec 
E)  2.5 $\times$ 1018 photons/sec 
A)  4.1 $\times$ 10-19 photons/sec 
B)  5.4 $\times$ 10-16 photons/sec 
C)  8.9 $\times$ 1014 photons/sec 
D)  1.8 $\times$ 1015 photons/sec 
E)  2.5 $\times$ 1018 photons/sec

Question 12

According to the Bohr model for the hydrogen atom,the energy necessary to excite an electron from n = 7 to n = 8 is ____ the energy necessary to excite an electron from n = 5 to n = 6.

Accepted Answer

A)  less than 
B)  greater than 
C)  equal to 
D)  either equal to or greater than 
E)  either less than or equal to 
A)  less than 
B)  greater than 
C)  equal to 
D)  either equal to or greater than 
E)  either less than or equal to

Question 13

Which of the following statements is INCORRECT?

Accepted Answer

A)  It is not possible to know the exact location of an electron and its exact energy simultaneously. 
B)  The energies of an atom's electrons are quantized. 
C)  Quantum numbers define the energy states and the orbitals available to an electron. 
D)  The behavior of an atom's electrons can be described by circular orbits around a nucleus. 
E)  Electrons have both wave and particle properties. 
A)  It is not possible to know the exact location of an electron and its exact energy simultaneously. 
B)  The energies of an atom's electrons are quantized. 
C)  Quantum numbers define the energy states and the orbitals available to an electron. 
D)  The behavior of an atom's electrons can be described by circular orbits around a nucleus. 
E)  Electrons have both wave and particle properties.

Question 14

In Bohr's atomic theory,when an electron moves from one energy level to another energy level more distant from the nucleus,

Accepted Answer

A)  energy is absorbed. 
B)  light is emitted. 
C)  energy is emitted. 
D)  no change in energy occurs. 
E)  none of these 
A)  energy is absorbed. 
B)  light is emitted. 
C)  energy is emitted. 
D)  no change in energy occurs. 
E)  none of these

Question 15

Which type of experiment demonstrates that light has the properties of a particle?

Accepted Answer

A)  nuclear fission 
B)  electron diffraction 
C)  light emission from atomic gases 
D)  mass spectroscopy 
E)  photoelectric effect 
A)  nuclear fission 
B)  electron diffraction 
C)  light emission from atomic gases 
D)  mass spectroscopy 
E)  photoelectric effect

Question 16

Which of the following statements is/are CORRECT?
1)The angular momentum quantum number,   
,of an electron in an s orbital is always equal to 0.
2)The magnetic quantum number,  
,of an electron in a p orbital is +1,0,or -1.
3)The principle quantum number,n,of an electron in a d orbital must be equal to or greater than 3.

Accepted Answer

A)  1 only 
B)  2 only 
C)  3 only 
D)  1 and 2 
E)  1,2,and 3 
A)  1 only 
B)  2 only 
C)  3 only 
D)  1 and 2 
E)  1,2,and 3

Question 17

A device operates at a frequency of   Hz.What is the wavelength of this radiation?

Accepted Answer

A)  667 nm 
B)    nm 
C)    nm 
D)  0.0895 nm 
E)    nm 
A)  667 nm 
B)    nm 
C)    nm 
D)  0.0895 nm 
E)    nm

Question 18

Which of the following sets of quantum numbers refers to a 4d orbital?

Accepted Answer

A)  n = 2,   = 1,   = -1 
B)  n = 2,   = 4,   = -1 
C)  n = 4,   = 2,   = -1 
D)  n = 4,   = 3,   = 0 
E)  n = 4,   = 3,   = +2 
A)  n = 2,   = 1,   = -1 
B)  n = 2,   = 4,   = -1 
C)  n = 4,   = 2,   = -1 
D)  n = 4,   = 3,   = 0 
E)  n = 4,   = 3,   = +2

Question 19

What is the wavelength of light emitted when the electron in a hydrogen atom undergoes a transition from level 
  (  
  )

Accepted Answer

A)    
B)    
C)    
D)    
E)    
A)    
B)    
C)    
D)    
E)

Question 20

Which of the following statements is/are CORRECT?
1)A paramagnetic substance is attracted to a magnetic field.
2)An atom with no unpaired electrons is ferromagnetic.
3)Atoms with one or more unpaired electrons are paramagnetic.

Accepted Answer

A)  1 only 
B)  2 only 
C)  3 only 
D)  1 and 3 
E)  1,2,and 3 
A)  1 only 
B)  2 only 
C)  3 only 
D)  1 and 3 
E)  1,2,and 3

Exam 7: The Structure of Atoms

For which of the following transitions would a hydrogen atom emit the lowest energy photon?

The energy required to break one mole of hydrogen-hydrogen bonds in H2 is 436 kJ/mol.What is the longest wavelength of light capable of breaking a single H-H bond?

The Bohr model predicts that the energy of an atom's electron is ________,meaning that the electron can only occupy orbitals of specific energies.

Which of the following properties is associated with the value of the quantum number?

Occupied states or energy levels in the hydrogen atom with n > 1 are called _____ states.

A point in a standing wave that has zero amplitude is called a(n)________.

How many values are there for the magnetic quantum number ( )when the value of the angular momentum quantum number ( )is 4?

A 4p orbital has ?

How many p orbitals are in the n = 3 shell?

A red laser pointer emits light at a wavelength of 488 nm.If the laser emits 7.5 ×\times× 10-4 J of energy per second in the form of visible radiation,how many photons per second are emitted from the laser?

According to the Bohr model for the hydrogen atom,the energy necessary to excite an electron from n = 7 to n = 8 is ____ the energy necessary to excite an electron from n = 5 to n = 6.

Which of the following statements is INCORRECT?

In Bohr's atomic theory,when an electron moves from one energy level to another energy level more distant from the nucleus,

Which type of experiment demonstrates that light has the properties of a particle?

A device operates at a frequency of Hz.What is the wavelength of this radiation?

Which of the following sets of quantum numbers refers to a 4d orbital?

What is the wavelength of light emitted when the electron in a hydrogen atom undergoes a transition from level ( )

Which of the following statements is/are CORRECT? 1)A paramagnetic substance is attracted to a magnetic field. 2)An atom with no unpaired electrons is ferromagnetic. 3)Atoms with one or more unpaired electrons are paramagnetic.

Basic Concepts of Chemistry

Mathlets Review: The Tools of Quantitative Chemistry

Atoms, molecules, and Ions

Chemical Reactions

Stoichiometry: Quantitative Information About Chemical Reactions

Principles of Chemical Reactivity: Energy and Chemical Reactions

The Structure of Atoms and Periodic Trends

Bonding and Molecular Structure

Bonding and Molecular Structure: Orbital Hybridization and Molecular Orbitals

Gases and Their Properties

Intermolecular Forces and Liquids

The Chemistry of Solids

Solutions and Their Behavior

Chemical Kinetics: the Rates of Chemical Reactions

Principles of Reactivity: Chemical Equilibria

The Chemistry of Acids and Bases

Principles of Reactivity: Other Aspects of Aqueous Equilibria

Entropy and Free Energy

Principles of Reactivity: Electron Transfer Reactions

Environmental Chemistry Earths Environment,energy,and Sustainability

The Chemistry of the Main Group Elements

The Chemistry of the Transition Elements

Carbon: Not Just Another Element

Biochemistry

Nuclear Chemistry

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The energy required to break one mole of hydrogen-hydrogen bonds in H₂ is 436 kJ/mol.What is the longest wavelength of light capable of breaking a single H-H bond?

A red laser pointer emits light at a wavelength of 488 nm.If the laser emits 7.5 $\times$ 10^-4 J of energy per second in the form of visible radiation,how many photons per second are emitted from the laser?