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Physical Science Ch. 4-5 Review
Test Description: Unit Test
Instructions: Answer all questions to get your test result.
1) Democritus thought that matter was made of tiny particles
A
of earth, air, fire, and water.
B
that could not be divided.
C
that could be divided.
D
that were all round and smooth.
2) According to John Dalton’s observations, when elements combine in a compound,
A
each element contributes an equal number of atoms.
B
their volumes are always equal.
C
their masses are always equal.
D
the ratio of their masses is always the same.
3) J.J. Thomson’s experiments provided evidence that an atom
A
has a negative charge.
B
is the smallest particle of matter
C
has a positive charge
D
contains negatively charged particles.
4) Who provided evidence for the existence of a nucleus in an atom?
A
Democritis
B
Thomson
C
Rutherford
D
Dalton
5) In an atomic model that includes a nucleus, positive charge is
A
spread evenly throughout an atom.
B
concentrated in the center of an atom.
C
spread evenly throughout an atom.
D
spread evenly throughout an atom.
6) Which statement about subatomic particles is NOT true?
A
Unlike protons and electrons, neutrons have no charge.
B
Protons and neutrons have the same charge.
C
Protons and neutrons have almost the same mass.
D
Protons and electrons have opposite charges.
7) Which of the following is unique for any given element?
A
the charge on the electrons
B
the number of neutrons
C
the number of protons
D
the mass of a neutron
8) The number of protons in one atom of an element is that element’s
A
atomic number.
B
isotope.
C
balanced charge.
D
mass number.
9) To find the number of neutrons in an atom, you would subtract
A
mass number from atomic number
B
isotope number from atomic number.
C
atomic number from mass number
D
atomic number from electron number.
10) Which statement is true about oxygen-17 and oxygen-18?
A
Their atoms have identical mass.
B
The have the same mass number.
C
They are isotopes of oxygen.
D
They do not have the same number of protons.
*select an answer for all questions
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