Physical Science Ch. 4-5 Review Question Preview (ID: 20842)
Unit Test.
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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.
According to John Dalton’s observations, when elements combine in a compound,
a) the ratio of their masses is always the same.
b) each element contributes an equal number of atoms.
c) their volumes are always equal.
d) their masses are always equal.
J.J. Thomson’s experiments provided evidence that an atom
a) is the smallest particle of matter
b) has a negative charge.
c) contains negatively charged particles.
d) has a positive charge
Who provided evidence for the existence of a nucleus in an atom?
a) Dalton
b) Thomson
c) Democritis
d) Rutherford
In an atomic model that includes a nucleus, positive charge is
a) concentrated in the center of an atom.
b) spread evenly throughout an atom.
c) spread evenly throughout an atom.
d) spread evenly throughout an atom.
Which statement about subatomic particles is NOT true?
a) Protons and neutrons have almost the same mass.
b) Protons and electrons have opposite charges.
c) Unlike protons and electrons, neutrons have no charge.
d) Protons and neutrons have the same charge.
Which of the following is unique for any given element?
a) the number of neutrons
b) the charge on the electrons
c) the number of protons
d) the mass of a neutron
The number of protons in one atom of an element is that element’s
a) mass number.
b) balanced charge.
c) atomic number.
d) isotope.
To find the number of neutrons in an atom, you would subtract
a) mass number from atomic number
b) atomic number from mass number
c) atomic number from electron number.
d) isotope number from atomic number.
Which statement is true about oxygen-17 and oxygen-18?
a) They do not have the same number of protons.
b) Their atoms have identical mass.
c) They are isotopes of oxygen.
d) The have the same mass number.
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