Answers2003350 Chemistry HONORS Sem 1 - MarezThe Historical Development of Atomic Theory

The Modern Atomic Theory Answers

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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.
2
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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
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

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.
6

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.
7

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
8

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.
9

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
10

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.

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