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Chapter 3 Test
Chapter 3 Test
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Chapter 3: Structure of Atoms Review
Flashcards
26 cards
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Questions
26
Answers
1
An atom is electrically neutral because
neutrons balance the protons and electrons
the number of protons and electrons are equal
nuclear forces stabilize the charges
the number of protons and neutrons are equal
2
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electron
atom
proton
neutron
3
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32 g
127 g
16 g
64 g
4
The carbon-12 atom is assigned a relative mass of exactly
100 amu
1 amu
6 amu
12 amu
5
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1:2
8:3
1:1
2:1
6
A positively charged particle with a mass 1.673 x 10
-24
g is a(n)
electron
proton
neutron
positron
7
Phosphorus-33 (atomic number 15) contains
18 protons
18 neutrons
33 neutrons
33 protons
8
Dalton incorporated the law of conservation of mass into his atomic theory by asserting that
matter is composed of atoms
atoms are indivisible
atoms of different elements have different properties
atoms can be destroyed in chemical reactions
9
The radius of an atom extends to the outer edge of the
nucleus
positive charges
region occupied by the neutrons
region occupied by the electrons
10
Protons within a nucleus are attracted to each other by
the nuclear force
their energy levels
opposite charges
electron repulsion
11
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24
30
12
10
12
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neutron
isotope
nuclide
electron
13
The law of definite proportions
replaced the law of conservation of mass
assumes that atoms of all elements are identical
contradicted Dalton's atomic theory
agrees with Dalton's atomic theory
14
How many isotopes of hydrogen are known?
4
1
3
2
15
In determining the atomic mass of elements, the standard is the
O-16 atom
C-14 atom
H-1 atom
C-12 atom
16
The mass of 2.0 mol of oxygen atoms (atomic mass 16.00 amu) is
48 g
32 g
16 g
64 g
17
In Rutherford's experiments, alpha particles
collided with electrons
passed through a tube containing gas
were used to bombard thin metal foil
were used to bombard a cathode plate
18
Experiments with cathode rays led to the discovery of the
neutron
electron
proton
nucleus
19
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definite composition
conservation of mass
multiple proportion
mass action
20
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doubles each time the mass number increases
remains the same
decreases
increases
21
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anode
millikan
electron
cathode
22
The mass of 1 mol of chromium (atomic mass 51.996 amu) is
12 g
6.02 x 1023 g
198 g
51.996 g
23
Isotopes are atoms of the same element that have different
numbers of electrons
masses
number of protons
principal chemical properties
24
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a magnetic field was produced
atoms were indivisible
the particles of the beam were negatively charged
there was gas in the tube
25
Avogadro's number is?
C
B
D
A
26
According to Dalton's atomic theory, atoms
can be divided
of each element are identical in size, mass, and other prop.
are destroyed in chemical reactions
of different elements cannot combine
