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Modern Chemistry Chapter 3 Flashcards | StudBud
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Modern Chemistry Chapter 3
Modern Chemistry Chapter 3
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#chemistry #modernchemistry #atomicstructure #isotopes #avogadro #mole
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1
A nuclear particle that has about the same mass as a proton but no electrical charge is the
nuclide
isotope
electron
neutron
2
The atomic theory proposed by Dalton has been
expanded and modified
totally discarded
found to be plagiarized
accepted unchanged to the present day
3
As atomic # increases, the # of electrons in a neutral atom
increases
decreases
is undetermined
remains the same
4
Molar mass
is numerically equal to average atomic mass of the element
Both of these
None of these
is the mass in grams of one mole of a substance
5
To determine the molar mass of an element, one must know the element's
number of isotopes
average atomic mass
Avogadro constant
atomic number
6
Which particle has the least mass?
all have the same mass
neutron
electron
proton
7
Avogadro's # is the
# of particles in exactly 1 gram of a pure substance
max # of electrons that all energy levels can accommodate
# of particles in 1 mole of a pure substance
# of protons and neutrons that can fit in the nucleus
8
Isotopes are atoms of the same element that have different
masses
principal chemical properties
numbers of protons
numbers of electrons
9
An important result of Rutherford's experiments with gold foil was to establish that
the atom is mostly empty space.
electrons have a negative charge.
atoms have mass.
neutrons are uncharged particles.
10
Phosphorus-33 (atomic # 15) contains
33 neutrons
33 protons
18 neutrons
18 protons
11
The average atomic mass of an element is the average of the atomic masses of its
two most abundant isotopes
artificial isotopes
naturally occurring isotopes
radioactive isotopes
12
All isotopes of hydrogen contain
two electrons
one neutron
one proton
two nuclei
13
How many moles of carbon are in a 28.0 g sample?
336 mol
0.500 mol
72.0 mol
2.33 mol
14
Chlorine has atomic number 17 and mass number 35. It has
17 protons, 17 electrons, and 18 neutrons
35 protons, 35 electrons, and 17 neutrons
17 protons, 17 electrons, and 52 neutrons
18 protons, 18 electrons, and 17 neutrons
15
Dalton's atomic theory agrees with modern atomic theory except for which of these?
atoms of the same element are chemically alike
atoms are not divided in chemical reactions
all atoms of the same element have the same mass
all matter is made up of small particles
16
Compared with a mole of neon (atomic # 10), a mole of calcium (atomic # 20) contains
20 times as many atoms
half as many atoms
twice as many atoms
an equal number of atoms
17
Atoms of the same element can differ in
mass number
atomic number
number of protons and electrons
chemical properties
18
As the mass # of an element's isotopes of an element increases, the # of protons
increases
decreases
stays the same
doubles each time the mass # increases
19
All atoms of the same element have the same
number of neutrons
atomic mass
mass #
atomic #
20
The atomic number of an element is the same as the number of
neutrons
protons+electrons
protons+neutrons
protons
21
How many neutrons are present in an atom that has an atomic number of 50 and mass of 119?
69
50
169
119
22
What is the mass of 1.50 mol of sodium (Na)?
0.478g
0.652g
11.0g
34.5g
23
Chemical compound has the same elements and same proportions by mass. This statement is of
The law of multiple proportions.
the law of conservation of mass.
the law of isotopes.
the law of definite proportions.
24
Which of the following statements is true according to modern atomic theory?
cathode rays are composed of protons
Atoms of the same element may have different masses
atoms may be divided in ordinary chemical reactions
atoms can never combine with any other atoms
25
The atomic mass of an element listed in the periodic table is the
mass number of the least abundant isotope
relative atomic mass of the most abundant isotope
average atomic mass
atomic mass of the most abundant radioactive isotope
26
The smallest unit of an element that can exist alone is
neutron
proton
electron
atom
27
The total # of protons and neutrons in the nucleus of an atom is its
atomic number
Avogadro number
mass number
average atomic mass
28
When elements react to form a compound, the mass of the compound is __ to the mass of elements
greater than
equal to
either greater than or less than
less than
29
Which subatomic particle has a charge of +1?
proton
neutron
electron
meson
