IPC Chapter 4 study questions-Willis
Dalton’s atomic theory was accepted
because
there was evidence to support it
Atoms have no electric charge because
they
have an equal number of electrons and
protons
according to the new model of the
atom, electrons behave like
waves on a vibrating string
According to modern atomic theory, it
is nearly impossible to determine an
electron’s exact
Valence electrons determine an atom’s
position
A mole is an SI base unit that describes
the
amount of a substance
chemical properties
If the atomic mass of carbon is 12u, 1
12g
mole of pure carbon will have a mass of
You have 85.5 g of fluorine, which has a 4.5
molar mass of approximately 19 g/mol. you divide 85.5/19
How many moles of fluorine do you
have?
Democritus’s original atomic theory
did not have a scientific basis
was revised because it
Which of these statements is not part
of Dalton’s atomic theory?
atoms are made of electrons
A subatomic particle that has a negative electron
charge is called a(n)
Who determined that atoms could be
divided?
Thomson
Thomson made his discovery about the
atom during an experiement using
cathode rays
Thomspn is responsible for discovering
that an atom contains
electrons
Which of the following statements not
true?
Neutrons have a negative charge.
What is an atom’s nucleus made of?
protons and neutrons
In ____ atomic model, negative
electrons orbit the positively charged
nucleus
Whose model determined that an
atom’s positive charge is concentrated
in the atom’s center?
What is the mass of 2.5 mol of Ca,
which has a molar mass of 40 g/mol?
Rutherford’s
Rutherford’s
Multiply
100.0g Ca
What is the amount of nickle, which has 8.90 mol
an average atomic mass of 58.7u,
present in 525 g nickel?
Avogadro’s number is useful for
counting atoms
What is the molar mass of an element
with an average atomic mass of
9.012u?
The charge of an atom is
9.012 grams
neutral
An iron atom has a atomic mass of 56
30
Its atomic number is 26. How many
neutrons does the iron atom have?
How much effect do commonly found
more than rarely found isotopes
isotopes have on the average atomic
mass of an element?
An element’s atomic number is equal to protons
its number of
Two different isotopes of an element
have different
numbers of neutrons
what is the mass number of an element
that has 19 protons, 19 electrons and
20 neutrons?
A sodium atom, which has 11 electrons,
has ____ electron(s) in its third energy
level.
Unlike the modern model of the atom,
Bohr’s model states that
39
add protons and neutrons together
Which of the following is not a type of
orbital?
x
An electron Jumps to a new energy
level when
the atom gains or loses energy
The number of energy levels filled in an
atom is determined by
electrons
Which of the following statements is
not true?
an f orbital can hold up to three
electrons
Dalton’s atomic theory stated that
every element was made of atoms that
could not be subdivided, atoms of the
same element are alike, and
atoms of different elements could form
to join compounds.
1
atoms cannot be divided into smaller
parts
Which statement about the atom’s
nucleus is correct?
the nucleus is made of protons and
neutrons and has a positive charge.
According to Rutherford’s model of the
atom, electrons behave like
planets orbiting the sun.
Oxygen’s atomic number is 8 This
means that oxygen atom has
eight protons in its nucleus
Which statement about an element’s
average atomic mass is correct?
it is a weighted average, so common
isotopes have a greater effect than
uncommon ones.
amount of a substance
A mole is an SI base unit that describes
the
If the average atomic mass of carbon
ISO 12.01u 1 mole of pure carbon will
have a mass of
The average atomic mass of potassium
is approximately 39 u. What is the
mass of 2.0 mol of potassium?
You have 6.50 mol of chromium, which
has a molar mass of approximately 52
g/mol. What is the mass in grams of
this amount of chromium?
which statement about the modern
model of the atom is not true?
12.01 u
Which statement is true according to
Dalton’s theory?
Atoms of the same element are exactly
alike
Accordigng to Bohr’s theory, an
electron’s path around the nucleus
defines its
An atom’s mass number equals the
number of
energy level
78g
338g
electrons can be found between energy
levels
protons plus the number of neutrons
A unified atomic mass unit is equal to
one-twelfth the mass of a carbon-12
atom
Avogadro’s number is defined as the
number of particles in
one mole of a substance
Molar mass is defined as
the mass in grams of one mole of a
substance
The average atomic mass of the
element cesium is approximately 133 u
What is the mass of 3.00 mol of
cesium?
What is the mass in grams of .75 mol of
sulfur, which has a molar mass of
approximately 32 g/mol
which of the following statements
about the modern model of the atom is
true
The word atom comes from a Greek
word that means
The first person who suggested that
matter was made up of atoms was the
Greek philosopher ____________
John Dalton’s atomic theory stated that
atoms of the same ______ are exactly
alike
Most atoms have equal numbers of
_____and ______
399g
A region in which there is a high
probability of finding an electron is
called a(n) ______
An element’s average atomic mass
refers to the weighted average of the
masses of all of its naturally occurring
______
orbital
24g
electrons can only be found in certain
energy levels
unable to be divided
Democritus
element
protons and electrons
isotopes
The ____ in ____ of 1 mole of a
substance equals its molar mass
mass, grams
The number of particles in one mole of
a substance is referred to as _______
Avogadro’s constant
The first theory of atoms proposed by
_____ suggested that the universe was
made of units that could not be divided
The nucleus of an atom has a(n)
__________ electric charge
Bohr’s model of the atom compares
electorns with ______
Democritus
Isotopes of an element have the same
atomic ______ but different atomic
________
The _____ is the SI unit that is used for
counting small particles, such as atoms
number, masses
The molar mass of krypton is
83.80g/mol. The mass of 5.00 mol of
krypton is _______g
Thomson’s study of cathode rays
revealed that atoms contained
negatively charged particles called
The number of energy levels that are
filled in atoms is determined by the
number of
An atom gains energy by absorbing a
light particle called a(n)
419
Thompson’s cathode-ray tube
experiment revealed that an atom’s
positive charge is concentrated in the
atom’s ______
Democritus
positive
planets
mole
electrons
photons
neutrons and protons are found in the
______ of an atom
nucleus
According to modern atomic theory,
the exact location of a(n) ______ is
uncertain
An atom of potassium has an atomic
mass of 39 u and an atomic number of
19 It therefore has ____ neutrons in its
nucleus
The molar mass of palladium is 106.42
g/mol. Therefore, 5302 g of palladium
contains _____mol.
The chemical properties of an atom are
determined by _____ which are located
in the atom’s outer energy level.
An electron that gains energy enters an
excited state and absorbs a particle of
light called a(n) _______
Explain how isotopes affect an
elements average atomic mass.
electrons
Explain the relationship between moles
and grams
If you know an element’s molar mass,
explain how you can determine the
mass of a particular amount of the
element
20
0.500
valence
photons
Because they are added to the number
of protons to make up the average
atomic mass. They have a different
number of neutrons relative to other
atoms of the same element.
grams is the actual weight of the
item… and moles is the SI base unit
used to measure the amount of a
substance whose number of particles is
the same as the number of atoms of
carbon in exactly 12 g of carbon-12
(moles are a measure of the number of
particles, not the mass)
Explain the major differences between
Bohr’s model of the atom and the
modern model.
Explain why atoms have no electric
charge even though they are made up
of charged particles