Answers26-27 CFISD TX-Chemistry A CRThe Modern Atomic Theory

The Modern Atomic Theory Answers

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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.
2
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Light of a certain energy shines on a metal and causes electrons to be emitted. Based on the research of Albert Einstein, what change would most likely result in stopping the emission of electrons from this metal?

A
an increase in the intensity of the light
B
a decrease in the intensity of the light
C
the use of light that has a higher frequency
D
the use of light that has a lower frequency
3

Which statement describes a major drawback of the Bohr model that caused scientists to replace it?

A
It worked only for helium and larger atoms.
B
It did not identify the distance between an electron and the nucleus.
C
It contradicted the Heisenberg uncertainty principle.
D
It stated that spectral lines of atoms are similar.
4

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.
5

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.
6

Natalie observes these characteristics in the model of an atom.(i) includes positive charge(ii) contains electrons(iii) explains the photoelectric effect(iv) suggests the probable location of electronsWhich model is Natalie most likely examining?

A
Bohr model
B
Dalton’s model
C
plum pudding model
D
electron-cloud model
7

The emission spectrum of hydrogen shows discrete, bright, colored lines. Which characteristic of the Bohr model is best supported by this observation?

A
Energy is released when an electron moves to a higher energy level.
B
Smaller atoms have fewer spectral lines than larger atoms.
C
The energy of an electron increases with distance from the nucleus.
D
Electrons cannot exist in locations other than in specific orbits.
8

Which equation was used by Albert Einstein to explain the photoelectric effect? [E = energy, h = Planck’s constant, and v = frequency.]

A
E =
Option A
B
E = hv
C
E =
Option C
D
E = h - v
9

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.
10

Which equation was used by Albert Einstein to explain the photoelectric effect? [E = energy, h = Planck’s constant, and v = frequency.]

A
E =
Option A
B
E = hv
C
E =
Option C
D
E = h - v
11

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
12

Which statement describes a major drawback of the Bohr model that caused scientists to replace it?

A
It worked only for helium and larger atoms.
B
It did not identify the distance between an electron and the nucleus.
C
It contradicted the Heisenberg uncertainty principle.
D
It stated that spectral lines of atoms are similar.
13

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.
14

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.
15

Light of a certain energy shines on a metal and causes electrons to be emitted. Based on the research of Albert Einstein, what change would most likely result in stopping the emission of electrons from this metal?

A
an increase in the intensity of the light
B
a decrease in the intensity of the light
C
the use of light that has a higher frequency
D
the use of light that has a lower frequency
16

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.
17

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.
18

Natalie observes these characteristics in the model of an atom.(i) includes positive charge(ii) contains electrons(iii) explains the photoelectric effect(iv) suggests the probable location of electronsWhich model is Natalie most likely examining?

A
Bohr model
B
Dalton’s model
C
plum pudding model
D
electron-cloud model
19

This flow chart shows the amount of energy that is emitted by each type of light. ultraviolet > blue light > yellow light > red light (maximum energy) (minimum energy)In an experiment, shining which type of light on a strip of metal would be least likely to produce the photoelectric effect?

A
ultraviolet light
B
dim blue light
C
bright red light
D
bright yellow light

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