Why did Bohr's Quantum Mechanical model struggle to gain acceptance amongst physicists?

His theory suggests that atoms do not obey Newtonian physics

Scientists use models to explain ideas. Which of these is a characteristic of a good model?

It conveys only one or two ideas in an easy-to-understand way

Aristotle's alchemical model was more respected than the atomos. Why?

He was able to provide proof for his theory

Our current understanding of the atom is described best as:

A cloud of electrons around a nucleus of protons & neutrons

Which of these is a disadvantage of scientific models?

They demonstrate ideas but do not represent reality

Lavoisier's metal oxide experiment is the reason we balance chemical reactions. What did he prove?

The mass of the reactants and products must be equal to each other

According to the Modern Atomic Theory, which of these is NOT true?

Matter can be converted from one element into another

What does the discovery that elements always combine in the same ratios mean for chemistry?

We can predict how elements will combine into compounds

Proust developed the Law of Constant Composition, which says what?

Elements always combine in the same mass ratios to form compounds

Bohr's model suggested the "quantum leap", which is when what happens?

Electrons absorb packets of energy and teleport to upper levels

How did Chadwick's discovery of the neutron solve Rutherford's mass problem?

It accounted for the extra atomic mass

The Law of Constant Composition implies what about atoms?

That they obey some set of rules as to how they combine into molecules

Rutherford's gold foil experiment shot alpha particles at gold foil. What did this prove?

Existence of a large, heavy mass in the atom's center

Which of these is the only idea from Dalton's atomic theory we do not still use?

All atoms of an element have the same mass and properties

The phlogiston theory was added to alchemy because alchemy could not explain what?

Why things lost mass when they burned

What was Rutherford's "mass problem?"

The number of protons in the nucleus did not add up to the mass

When an electron falls back down to ground state, what determines the wavelength of light it emits?

The energy difference between the two positions

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Atomic Theory Review

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#O'Hair Review questions for the final exam covering atomic theory

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Questions 23

Answers

1
When was the idea of the "atom" first theorized?
Ancient Greece
17th century Germany
5th century Iran
18th century France
2
Why did Bohr's Quantum Mechanical model struggle to gain acceptance amongst physicists?
Bohr had not calculated the angular velocity of the atom
It still did not explain why electrons were so small
His theory suggests that atoms do not obey Newtonian physics
It described an atom that could not exist in 3 dimensions
3
Scientists use models to explain ideas. Which of these is a characteristic of a good model?
It explains many ideas at once
It conveys only one or two ideas in an easy-to-understand way
It uses several colors and 3-D rendering
It came from a reputable modelling agency
4
Aristotle's alchemical model was more respected than the atomos. Why?
Microscopic studies had proven the atom wrong
The inventor of the atom theory had been arrested for heresy
He was able to provide proof for his theory
His theory worked better than atoms
5
Our current understanding of the atom is described best as:
A blob of positive charge with electrons embedded in it
A solid ball of matter
A cloud of electrons around a nucleus of protons & neutrons
Electrons orbiting the nucleus like planets
6
Which of these is a disadvantage of scientific models?
They are always too complicated for lay-people to understand
They demonstrate ideas but do not represent reality
They are always difficult to make
You need to understand the idea to understand the model
7
Lavoisier's metal oxide experiment is the reason we balance chemical reactions. What did he prove?
The mass of each of the reactants must be equal
The number of protons must equal the number of electrons
The mass of each of the products must be equal
The mass of the reactants and products must be equal to each other
8
According to the Modern Atomic Theory, which of these is NOT true?
Matter can be converted from one element into another
Matter cannot be destroyed
Matter cannot be created
Matter cannot be divided into smaller pieces
9
What does the discovery that elements always combine in the same ratios mean for chemistry?
Compounds are all made from equal numbers of elements
Elements are all made of the same particles
Elements combine in unknowable ways
We can predict how elements will combine into compounds
10
JJ Thompson discovered the first subatomic particle, disproving Dalton's model. Which was it?
Hadron
Neutron
Electron
Proton
11
Proust developed the Law of Constant Composition, which says what?
Elements always combine in the same mass ratios to form compounds
All matter is made of atoms
Compounds are always made out of the same elements
Atoms are always made from protons, neutrons, and electrons
12
Bohr's model suggested the "quantum leap", which is when what happens?
A proton leaps to the opposite side of the nucleus
An electron leaps forward or backward in time
Neutrons leap from nucleus as radiation
Electrons absorb packets of energy and teleport to upper levels
13
How did Chadwick's discovery of the neutron solve Rutherford's mass problem?
It had no bearing on Rutherford's model
It accounted for the extra atomic mass
It proved the electrons did not occupy the nucleus
It proved radiation was possible
14
After discovering the electrons, Thomson replaced Dalton's model with his own, called the...
Orbiting Electron model
Quantum Mechanical model
Plum Pudding model
Nuclear Atom model
15
The Law of Constant Composition implies what about atoms?
That all of their mass is concentrated in the nucleus
That they obey some set of rules as to how they combine into molecules
That they do not obey the laws of Newtonian physics
None of these
16
Rutherford's gold foil experiment shot alpha particles at gold foil. What did this prove?
Gold was an excellent conductor of heat and electricity
The sea of electrons
Existence of a large, heavy mass in the atom's center
Rutherford had too much free time
17
Which of these describes Dalton's atomic model, the first ever atomic model?
A solid sphere
The Plum Pudding model
The Quantum Mechanical model
A solar system model where electrons orbit the nucleus
18
Antoine Lavoisier disproved which two atomic theories with his metal oxide experiment?
Phlogiston and the plum pudding model
The nuclear theory and alchemy
Phlogiston and alchemy
the quantum mechanical theory and the nuclear thoery
19
Which of these is the only idea from Dalton's atomic theory we do not still use?
Atoms cannot be destroyed
All atoms of an element have the same mass and properties
Atoms cannot be created
Elements combine in simplest integer ratios in compounds
20
The phlogiston theory was added to alchemy because alchemy could not explain what?
Why electrons could not exist in the nucleus
Why matter could not be created or destroyed
Why things lost mass when they burned
Why atoms were so small
21
What happens when an excited electron falls back down to its original position?
The atom heats up
It emits a proton
It emits a photon
It emits electricity
22
What was Rutherford's "mass problem?"
The number of protons in the nucleus did not add up to the mass
Why the electrons had so little mass
Why the atoms stopped attending the Catholic Church
Why the neutrons did not seem to have mass
23
When an electron falls back down to ground state, what determines the wavelength of light it emits?
The energy difference between the two positions
A guy named Harold
The kinetic energy of the electron
The amount of energy in the ground state

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