AnswersLA-Chemistry AThe Historical Development of Atomic Theory

The Modern Atomic Theory Answers

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1
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According to the Bohr model of an atom, what happens when an electron moves from the second energy level to the third energy level and then back to the second energy level?

A
Energy is absorbed and then stored in the atom.
B
Energy is released and then absorbed to form an absorption line.
C
Energy is absorbed and then released to form an emission line.
D
Energy is released from the atom, and the outer level is weakened.
2
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Which event would be impossible to explain by using John Dalton’s model of the atom?

A
An iron atom emits particles when it is struck by light.
B
An oxygen atom combines with two hydrogen atoms to form water.
C
An acid reacts with a base to form salt and water.
D
The atoms in sodium metal react with water.
3

How does the electron-cloud model describe electrons?

A
The exact position of an electron can be known.
B
An electron can be found at certain distances from the nucleus.
C
An electron has a high probability of being in certain regions.
D
Each electron follows a specific path around the nucleus.
4

A change in which property of light will have no effect on whether or not the photoelectric effect occurs?

A
frequency
B
energy
C
intensity
D
wavelength
5

Which statement about the electron-cloud model is true?

A
It is the currently accepted atomic model.
B
It can easily be replaced by existing models.
C
It specifies the location and momentum of an electron.
D
It does not explain the formation of emission lines.
6

The diagram shows Niels Bohr’s model of an atom. What happens when the electron moves from the first energy level to the second energy level?

Question illustration
A
Energy is absorbed, and an emission line is produced.
B
Energy is released, and an emission line is produced.
C
Energy is absorbed by the atom.
D
Energy is lost from the atom.
7

Which statement about Niels Bohr’s atomic model is true?

A
Higher orbits have lower energies.
B
Each orbit has a specific energy level.
C
Electrons can exist in any energy level.
D
Orbits close to the nucleus have no energy.
8

Which atomic model states that it is impossible to know the exact location of electrons around the nucleus?

A
Bohr model
B
Dalton model
C
plum pudding model
D
electron-cloud model
9

The Bohr model of the atom explained why emission spectra are discrete. It could also be used to explain the photoelectric effect. Which is a correct explanation of the photoelectric effect according to the model?

A
Electrons are emitted with more speed when brighter light strikes them.
B
Electrons need small amounts of energy to be released from an atom.
C
Electrons move between levels only if they are hit by the right frequency of light.
D
Electrons need specific amounts of energy to jump levels and be emitted.
10

Which observation provided Albert Einstein the clue that he needed to explain the photoelectric effect?

A
Light is made up of extremely small particles.
B
Particles that are emitted from a strip of metal are electrons.
C
Shining light on a metal strip produces emissions.
D
Energy of electrons depends on light’s frequency, not intensity.

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