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

Matter can be converted from one element into another

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

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

We can predict how elements will combine into compounds

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

It accounted for the extra atomic mass

What was Rutherford's "mass problem?"

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

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

The Law of Constant Composition implies what about atoms?

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

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

Which of these is a disadvantage of scientific models?

They demonstrate ideas but do not represent reality

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

Electrons absorb packets of energy and teleport to upper levels

Our current understanding of the atom is described best as:

A cloud of electrons around a nucleus of protons & neutrons

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

He was able to provide proof for his theory

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

His theory suggests that atoms do not obey Newtonian physics

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

Elements always combine in the same mass ratios to form compounds

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

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

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