Answers2003350 Chemistry HONORS Sem 1 - MarezThe Nature of Chemistry

The Modern Atomic Theory Answers

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1
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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.
2
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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.
3

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
4

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.
5

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
6

The modern-day quantum model of the atom is better than John Dalton’s model because it

A
has set electron orbits.
B
has positive and negative particles in the nucleus.
C
can be represented in one dimension.
D
answers many questions about atoms.
7

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
8

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
9

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.
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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