The total volume of the nucleus of an atom is

very small compared with the rest of the atom.

Which is one way that Dalton’s atomic theory has been shown to be incorrect?

Atoms can be split into subatomic particles.

Electrons can be found

moving rapidly outside the nucleus.

Which of the following is not part of Dalton’s atomic theory?

An atom consists of a nucleus and a cloud of electrons.

The atomic number of an element is

the number of protons in each atom of the element.

the total number of protons and neutrons in an element.

What is the definition of one atomic mass unit?

1/12 of the mass of a carbon-12 atom

Why do protons remain close to one another in the nucleus?

The strong nuclear force, binds protons together.

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Chemistry Chapter 3 Review

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Questions 20

Answers

1
The total volume of the nucleus of an atom is
about the same size as an electron.
smaller than a neutron.
very small compared with the rest of the atom.
very large compared with the rest of the atom.
2
Which is one way that Dalton’s atomic theory has been shown to be incorrect?
Atoms can change identity in chemical reactions.
Atoms can be destroyed by chemical reactions.
Atoms can be split into subatomic particles.
Some atoms of an element are identical.
3
Experiments with cathode rays showed that they are composed of particles that are
magnetic.
neutral in charge.
positively charged.
negatively charged.
4
Electrons can be found
moving rapidly outside the nucleus.
inside protons.
attached to the nucleus.
inside neutrons.
5
Mass is neither created nor destroyed in a chemical reaction. This law is called the law of
conservation of mass.
definite proportions.
gravity.
conservation of momentum.
6
Cathode rays are composed of particles that are now known as
neutrons
protons
positrons
electrons
7
Isotopes are atoms of the same element that have different
charges
masses
protons
electrons
8
Every chemical compound contains the same elements in the same proportions.
definite proportions.
conservation of energy.
conservation of mass.
atomic theory.
9
John Dalton thought that atoms
have no mass.
contain molecules.
cannot be broken down further.
are all composed of carbon.
10
The molar mass of an element is numerically equal to the element’s
average number of protons
average number of electrons.
average atomic number.
average atomic mass.
11
Which of the following is not part of Dalton’s atomic theory?
All matter is composed of atoms.
An atom consists of a nucleus and a cloud of electrons.
Atoms cannot be subdivided, created, or destroyed.
atoms are combined, separated, orrearranged.
12
The isotope uranium-235 has 92 protons and 143 neutrons. Therefore, its mass number is
235
146
Dunno
92
13
The atomic number of an element is
the number of protons in each atom of the element.
the number of neutrons in each atom of the element.
1 mol of the element.
the mass of the element.
14
Rutherford called the region that deflected alpha particles
an electron
a quark
a nucleus
a neutron
15
Mass number is
the total number of electrons in an atom of an element.
the total number of protons and neutrons in an element.
the average atomic mass of an element.
the total number of protons in an atom of an element.
16
Who performed the gold foil experiment?
Rutherford
Thomson
Dalton
Chadwick
17
What is the definition of one atomic mass unit?
1 mol of any element
1 g of any element
1/12 of the mass of any atom
1/12 of the mass of a carbon-12 atom
18
What is the charge of a neutron?
positive
neutral
none of these
negative
19
Most of an atom is
fluid
empty space
the nucleus
dense.
20
Why do protons remain close to one another in the nucleus?
The strong nuclear force, binds protons together.
Protons are balanced electrically by electrons.
There is no electric charge in the nucleus of an atom.
Neutrons cancel out the electric force.

Chemistry Chapter 3 Review Flashcards | StudBud

Chemistry Chapter 3 Review

20 termsStudBud Administration51 plays

Chemistry Chapter 3 Review

Flashcards20 cardsFPractice quizPHost liveL

Questions 20

Answers

1
The total volume of the nucleus of an atom is
about the same size as an electron.
smaller than a neutron.
very small compared with the rest of the atom.
very large compared with the rest of the atom.
2
Which is one way that Dalton’s atomic theory has been shown to be incorrect?
Atoms can change identity in chemical reactions.
Atoms can be destroyed by chemical reactions.
Atoms can be split into subatomic particles.
Some atoms of an element are identical.
3
Experiments with cathode rays showed that they are composed of particles that are
magnetic.
neutral in charge.
positively charged.
negatively charged.
4
Electrons can be found
moving rapidly outside the nucleus.
inside protons.
attached to the nucleus.
inside neutrons.
5
Mass is neither created nor destroyed in a chemical reaction. This law is called the law of
conservation of mass.
definite proportions.
gravity.
conservation of momentum.
6
Cathode rays are composed of particles that are now known as
neutrons
protons
positrons
electrons
7
Isotopes are atoms of the same element that have different
charges
masses
protons
electrons
8
Every chemical compound contains the same elements in the same proportions.
definite proportions.
conservation of energy.
conservation of mass.
atomic theory.
9
John Dalton thought that atoms
have no mass.
contain molecules.
cannot be broken down further.
are all composed of carbon.
10
The molar mass of an element is numerically equal to the element’s
average number of protons
average number of electrons.
average atomic number.
average atomic mass.
11
Which of the following is not part of Dalton’s atomic theory?
All matter is composed of atoms.
An atom consists of a nucleus and a cloud of electrons.
Atoms cannot be subdivided, created, or destroyed.
atoms are combined, separated, orrearranged.
12
The isotope uranium-235 has 92 protons and 143 neutrons. Therefore, its mass number is
235
146
Dunno
92
13
The atomic number of an element is
the number of protons in each atom of the element.
the number of neutrons in each atom of the element.
1 mol of the element.
the mass of the element.
14
Rutherford called the region that deflected alpha particles
an electron
a quark
a nucleus
a neutron
15
Mass number is
the total number of electrons in an atom of an element.
the total number of protons and neutrons in an element.
the average atomic mass of an element.
the total number of protons in an atom of an element.
16
Who performed the gold foil experiment?
Rutherford
Thomson
Dalton
Chadwick
17
What is the definition of one atomic mass unit?
1 mol of any element
1 g of any element
1/12 of the mass of any atom
1/12 of the mass of a carbon-12 atom
18
What is the charge of a neutron?
positive
neutral
none of these
negative
19
Most of an atom is
fluid
empty space
the nucleus
dense.
20
Why do protons remain close to one another in the nucleus?
The strong nuclear force, binds protons together.
Protons are balanced electrically by electrons.
There is no electric charge in the nucleus of an atom.
Neutrons cancel out the electric force.