AnswersFL-2003350-Chemistry 1 HonorsThe Modern Atomic Theory

The Modern Atomic Theory Answers

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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.
2
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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.
3

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.
4

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.
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

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.
7

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.
8

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
9

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
10

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.

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