AnswersLA-Chemistry AThe Historical Development of Atomic Theory

The Historical Development of Atomic Theory Answers

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1
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How did the development of the earliest idea about atoms differ from the later work of scientists?

A
It was based on sound evidence.
B
There were explanations for the idea.
C
It was based on the thoughts of an early philosopher.
D
There were experiments conducted to support the idea.
2
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What did Ernest Rutherford’s gold foil experiment demonstrate about atoms?

A
Their positive charge is located in a small region that is called the nucleus.
B
Their negative charge is located in small particles that are called electrons.
C
Their nucleus makes up the majority of the volume of the atom.
D
Their electrons are floating in a sea of positive charges.
3

Which best describes the effect of J. J. Thomson’s discovery?

A
The accepted model of the atom was changed.
B
The accepted model of the atom was supported.
C
Cathode ray tubes were no longer used in experiments due to poor results.
D
Cathode ray tubes became the only instrument of use in the study of atoms.
4

Which particle is J. J. Thomson credited with discovering?

A
electron
B
neutron
C
proton
D
photon
5

Which statement is most likely true?

A
Ernest Rutherford’s experiment led to the nuclear model of the atom.
B
Ernest Rutherford’s experiment established the plum pudding model of the atom.
C
Robert Millikan’s postulates form the most accepted theory for the atomic structure.
D
Robert Millikan’s results had little impact on determining of the charge of an electron.
6

Which statement best summarizes the importance of Ernest Rutherford’s gold foil experiment?

A
It proved that all of John Dalton’s postulates were true.
B
It verified J. J. Thomson’s work on the atomic structure.
C
It showed that an electron circles a nucleus in a fixed-energy orbit.
D
It showed that a nucleus occupies a small part of the whole atom.
7

Which conclusion could be made from Ernest Rutherford’s gold foil experiment?

A
Atoms are made up of mostly empty space.
B
Atoms are mainly solid and block alpha particles.
C
The volume of the nucleus is large compared to the rest of the atom.
D
The mass of the nucleus is small compared to the rest of the atom.
8

Whose work directly resulted in the development of an atomic model that has negative electrons stuck within a sea of positive material?

A
Democritus
B
Rutherford
C
Thomson
D
Dalton
9

Which scientist provided a foundation for John Dalton’s work on the atomic structure?

A
Robert Millikan
B
Joseph Proust
C
Ernest Rutherford
D
J. J. Thomson
10

From his experiments, J. J. Thomson concluded that

A
cathode ray particles can move at very fast speeds.
B
cathode ray particles can be moved by electric current.
C
atoms contain small positively charged particles that are called protons.
D
atoms contain small negatively charged particles that are called electrons.

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