Gases such as CO2 and methane are considered greenhouse gases.This is because

A) they are the most common in the atmosphere allowing them to trap more heat than the other gases. B) they form covalent bonds and hence can easily act as a shield for heat. C) the vibrational modes of the molecules are in the infrared region which imply that they readily absorb radiant heat thus preventing it from escaping into space. D) the gases are formed by human activity resulting in offsetting the natural balance in the gas concentrations. E) None of the above statements is correct. A) they are the most common in the atmosphere allowing them to trap more heat than the other gases. B) they form covalent bonds and hence can easily act as a shield for heat. C) the vibrational modes of the molecules are in the infrared region which imply that they readily absorb radiant heat thus preventing it from escaping into space. D) the gases are formed by human activity resulting in offsetting the natural balance in the gas concentrations. E) None of the above statements is correct.

In the absorption spectrum of the diatomic molecule HCl the central frequency is at 8.67 $\times$ 1013 Hz,while the absorption peaks on either side are separated by 5.9 $\times$ 1011 Hz.What is the energy of the lowest vibrational state?

A) 0.18 eV B) 0.27 eV C) 0.36 eV D) 2.4 meV E) 1.2 meV A) 0.18 eV B) 0.27 eV C) 0.36 eV D) 2.4 meV E) 1.2 meV

In the absorption spectrum of the diatomic molecule HCl the central frequency is at 8.67 $\times$ 1013 Hz,while the absorption peaks on either side are separated by 5.9 $\times$ 1011 Hz.What is the average moment of inertia of a rotating HCl molecule?

A) 1.4 $\times$ 10-47 kg.m2 B) 7.1 $\times$ 10-48 kg.m2 C) 1.1 $\times$ 10-45 kg.m2 D) 2.8 $\times$ 10-47 kg.m2 E) None of these is correct. A) 1.4 $\times$ 10-47 kg.m2 B) 7.1 $\times$ 10-48 kg.m2 C) 1.1 $\times$ 10-45 kg.m2 D) 2.8 $\times$ 10-47 kg.m2 E) None of these is correct.

Exam 37: Molecules

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The characteristic energy of rotation E_0r for the O₂ molecule is 1.78 $\times$ 10^-4 eV.Calculate the frequency of the photon absorbed for the excitation from the l = 3 to l = 4 rotational level of this diatomic molecule.

(Multiple Choice)

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Question 21

Transitions between vibrational states of different electronic states result in the emission of photons in or near the _______ portion of the electromagnetic spectrum.

(Multiple Choice)

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Question 22

The energies due to the electronic excitations of a molecule are of the order of 1 eV,whereas

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Question 23

When a NaCl molecule is formed from neutral Na and Cl atoms,

(Multiple Choice)

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Question 24

Gases such as CO₂ and methane are considered greenhouse gases.This is because

(Multiple Choice)

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Question 25

Which of the following statements about covalent bonding is true?

(Multiple Choice)

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Question 26

The energy released by an atom's acquisition of one electron is called its

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Question 27

The effective force constant of the CO molecule is 1.86 kN/m.With 12 u for the mass of the carbon atom and 16 u for the mass of the oxygen atom,the frequency of vibration of the CO molecule is

(Multiple Choice)

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Question 28

The dissociation energy of an ionic compound is the negative of the potential energy of the positive-negative ion system when the ions are

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Question 29

If the electrostatic potential energy of Na⁺ and F^- ions at their equilibrium separation (with U = 0 at infinite separation)is -1.19 $\times$ 10^-18 J,then their equilibrium separation must be approximately

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Question 30

The _______ bond is responsible for the bonding of identical or similar atoms.

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Question 31

The reduced mass of a two-body system in which the masses of the bodies are 2 u and 5 u is

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Question 32

The magnetron of a microwave oven generates a frequency of 2.45 GHz.This frequency corresponds to the first vibrational level, ,of a water molecule.Assuming that the energy is given by ,the moment of inertia of the water molecule is

(Multiple Choice)

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Question 33

In the absorption spectrum of the diatomic molecule HCl the central frequency is at 8.67 $\times$ 10¹³ Hz,while the absorption peaks on either side are separated by 5.9 $\times$ 10¹¹ Hz.What is the energy of the lowest vibrational state?

(Multiple Choice)

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Question 34

Which one of the following statements is true of the van der Waals bond?

(Multiple Choice)

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Question 35

The reduced mass of a two-body system is 2.1 u.If one of the masses is 3 u,then what is the mass of the second body?

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Question 36

In the absorption spectrum of the diatomic molecule HCl the central frequency is at 8.67 $\times$ 10¹³ Hz,while the absorption peaks on either side are separated by 5.9 $\times$ 10¹¹ Hz.What is the average moment of inertia of a rotating HCl molecule?

(Multiple Choice)

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Question 37

If the H₂ molecule has a rotational energy of E_0r = 0.040 MeV,what is the average distance between the two atoms?

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Question 38

From the frequency of vibration the effective force constant of the HCl molecule is found to be 840 N/m.In order to appreciate the stiffness of the binding force,or imaginary "spring," between the H and Cl,calculate how far a spring of the same stiffness would extend if a 10 kg weight were hung from it.

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Question 39

Showing 21 - 39 of 39

Exam 37: Molecules

The characteristic energy of rotation E0r for the O2 molecule is 1.78 ×\times× 10-4 eV.Calculate the frequency of the photon absorbed for the excitation from the l = 3 to l = 4 rotational level of this diatomic molecule.

Transitions between vibrational states of different electronic states result in the emission of photons in or near the _______ portion of the electromagnetic spectrum.

The energies due to the electronic excitations of a molecule are of the order of 1 eV,whereas

When a NaCl molecule is formed from neutral Na and Cl atoms,

Gases such as CO2 and methane are considered greenhouse gases.This is because

Which of the following statements about covalent bonding is true?

The energy released by an atom's acquisition of one electron is called its

The effective force constant of the CO molecule is 1.86 kN/m.With 12 u for the mass of the carbon atom and 16 u for the mass of the oxygen atom,the frequency of vibration of the CO molecule is

The dissociation energy of an ionic compound is the negative of the potential energy of the positive-negative ion system when the ions are

If the electrostatic potential energy of Na+ and F- ions at their equilibrium separation (with U = 0 at infinite separation)is -1.19 ×\times× 10-18 J,then their equilibrium separation must be approximately

The _______ bond is responsible for the bonding of identical or similar atoms.

The reduced mass of a two-body system in which the masses of the bodies are 2 u and 5 u is

The magnetron of a microwave oven generates a frequency of 2.45 GHz.This frequency corresponds to the first vibrational level, ,of a water molecule.Assuming that the energy is given by ,the moment of inertia of the water molecule is

In the absorption spectrum of the diatomic molecule HCl the central frequency is at 8.67 ×\times× 1013 Hz,while the absorption peaks on either side are separated by 5.9 ×\times× 1011 Hz.What is the energy of the lowest vibrational state?

Which one of the following statements is true of the van der Waals bond?

The reduced mass of a two-body system is 2.1 u.If one of the masses is 3 u,then what is the mass of the second body?

In the absorption spectrum of the diatomic molecule HCl the central frequency is at 8.67 ×\times× 1013 Hz,while the absorption peaks on either side are separated by 5.9 ×\times× 1011 Hz.What is the average moment of inertia of a rotating HCl molecule?

If the H2 molecule has a rotational energy of E0r = 0.040 MeV,what is the average distance between the two atoms?

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The characteristic energy of rotation E_0r for the O₂ molecule is 1.78 $\times$ 10^-4 eV.Calculate the frequency of the photon absorbed for the excitation from the l = 3 to l = 4 rotational level of this diatomic molecule.

Gases such as CO₂ and methane are considered greenhouse gases.This is because

If the electrostatic potential energy of Na⁺ and F^- ions at their equilibrium separation (with U = 0 at infinite separation)is -1.19 $\times$ 10^-18 J,then their equilibrium separation must be approximately

In the absorption spectrum of the diatomic molecule HCl the central frequency is at 8.67 $\times$ 10¹³ Hz,while the absorption peaks on either side are separated by 5.9 $\times$ 10¹¹ Hz.What is the energy of the lowest vibrational state?

In the absorption spectrum of the diatomic molecule HCl the central frequency is at 8.67 $\times$ 10¹³ Hz,while the absorption peaks on either side are separated by 5.9 $\times$ 10¹¹ Hz.What is the average moment of inertia of a rotating HCl molecule?

If the H₂ molecule has a rotational energy of E_0r = 0.040 MeV,what is the average distance between the two atoms?