Atomic Theory Answers

8 verified answers
1
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Based on the article "Will the real atomic model please stand up?,” describe what Dalton’s theory states about a molecule of water.

Answer:

Dalton’s theory about compounds tells us that all water molecules have different kinds of atoms, two hydrogen atoms for every one oxygen atom.

2
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What did you include in your response? Check all that apply.

A
Water molecules are made of two different kinds of atoms.
B
All water molecules have twice as many hydrogen atoms as oxygen atoms.
C
All water molecules have one oxygen atom for every two hydrogen atoms.
3

Based on the article “Will the real atomic model please stand up?,” why did J.J. Thomson experiment with cathode ray tubes?

A
to specifically identify the nucleus as a separate part of an atom
B
to determine that electric beams in cathode ray tubes were actually made of particles
C
to prove John Dalton and Democritus wrong
D
to determine the exact energy output of cathode ray tubes
5

What did J.J. Thomson’s experiments with cathode ray tubes imply about the mass of an electron?

A
Electrons are many thousand times larger than the nucleus and negatively charged.
B
Electrons are many thousand times smaller than the nucleus and positively charged.
C
Electrons are many thousand times smaller than the nucleus and negatively charged.
D
Electrons are many thousand times larger than the nucleus and possess no charge.
6

What did Ernest Rutherford expect to happen when he aimed a beam of particles at a thin gold foil?

A
The particles would deflect at sharp angles or completely back toward the emitter.
B
The particles would pass through the foil undisturbed.
C
The particles would deflect at right angles after hitting the foil.
D
The particles would be deflected slightly after passing through the foil.
8

Bohr’s atomic model differed from Rutherford's because it explained that

A
electrons exist in specified energy levels surrounding the nucleus.
B
electrons are embedded within the rest of the atom like plum pudding.
C
an atom is an indivisible sphere.
D
electrons circle the nucleus.
10

Based on the article "Will the real atomic model please stand up?,” describe one major change that occurred in the development of the modern atomic model.

Answer:

The one major change that occurred was the placement and organization of the electron. Rutherford’s model identified that the electrons were at a distance from the nucleus, Bohr’s model identified that the electrons occurred at levels that related to their available energy, and the modern atomic model shows that electrons are located in a predicted area but cannot be identified in a specific point.

11

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