Quantum Mechanical Model Key Concepts Check

What was wrong with the Bohr model?

• It was disproved by the gold foil experiment.

• It could only describe the emission spectrum of hydrogen.

• It could only describe the emission spectra of elements with more than one electron.

• It was disproved by the cathode ray experiment.

How did de Brolie's idea about matter affect the development of the quantum mechanical model?

• The electron can move between different defined orbits

• The electron can be viewed as only a particle

• The electron can be viewed as particle and a wave.

• The electron can only be viewed as a wave.

Tags

NGSS.HS-PS4-3

Which equation is used to calculate the wavelength associated with matter?

• c = λν

• λ = c/ν

• λ = h / mv

• λ = ch / E

Tags

NGSS.HS-PS4-1

What do the different parts of the de Broglie equation (λ = h / mv) equal?

• h = Planck's constant, m = meters, v = frequency

• h = Planck's constant, m = meters, v = velocity

• h = Planck's constant, m = mass, v = frequency

• h = Planck's constant, m = mass, v = velocity

Tags

NGSS.HS-PS4-3

How did the Heisenberg Uncertainty Principle affect the quantum mechanical model?

• You can't know the momentum and position of the electron at the same time.

• You can know the momentum and position of the electron at the same time.

• You can't know the mass and charge of an electron at the same time.

• You can't know the frequency and wavelength at the same time.

Why can't you know the momentum and velocity of an electron at the same time?

• According to de Broglie, the act of trying to measure each value affects the accuracy of being able to determine the other.

• According to Heisenberg, the act of trying to measure each value affects the accuracy of being able to determine the other,

• According to de Broglie, scientific tools will never be precise enough to measure either quantity. .

• According to Heisenberg, scientific tools will never be precise enough to measure either quantity. .

What is the purpose of the Schrödinger wave equation?

• It defines areas around the nucleus called orbits where the electron is likely to be found.

• It defines areas around the nucleus called orbitals where the electron is likely to be found.

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What is the difference between orbits and orbitals?

• Orbits are circular paths that the electron takes around the nucleus in the Quantum mechanical model. Orbitals are 3-D areas around the nucleus where the electron is probably found in the Bohr model.

• Orbitals are circular paths that the electron takes around the nucleus in the Bohr model. Orbits are 3-D areas around the nucleus where the electron is probably found in the quantum mechanical model.

• Orbits are circular paths that the electron takes around the nucleus in the Bohr model. Orbitals are 3-D areas around the nucleus where the electron is probably found in the quantum mechanical model.

Select features that apply only to the quantum mechanical model.

• Electrons are located in orbitals in different energy levels.

• Electrons are located in orbits corresponding to different energy levels.

• The electron is treated as only a particle.

• The electron behaves as both a wave and a particle.

Tags

NGSS.HS-PS4-3

What is the purpose of the quantum numbers?

• To calculate wavelength associated with the moving electron.

• To calculate velocity associated with the moving electron.

• To predict the probable location of an electron in the Bohr model.

• To predict the probable location of an electron in the quantum mechanical model.