Some Basic Concepts of Chemistry
What is the arrangement of particles in solids?
a) Loosely
packed
b) Random
c) Closely
packed
d) Free to
move
Answer: c)
Closely packed
What type of motion can particles
in solids have?
a)
Translational motion
b)
Rotational motion
c)
Vibratory motion
d) Random
motion
Answer: c)
Vibratory motion
What gives definite regular shape
to crystals in solids?
a)
Vibratory motion of particles
b) Random
arrangement of particles
c) Closely
packed particles
d)
Interparticle forces
Answer: c)
Closely packed particles
What are the interparticle forces
in solids?
a) Weak
b) Strong
c)
Non-existent
d)
Opposite of attractive
Answer: b)
Strong
Do solids have a definite shape and
volume?
a)
Definite shape, no definite volume
b) No
definite shape, definite volume
c)
Definite shape, definite volume
d) No
definite shape, no definite volume
Answer: c)
Definite shape, definite volume
What is the arrangement of
particles in liquids?
a) Closely
packed
b) Random
c) Loosely
packed
d) Free to
move
Answer: b)
Random
Do liquids have a fixed shape?
a) Yes
b) No
Answer: b)
No
Do liquids have a definite volume?
a) Yes
b) No
Answer: a)
Yes
What happens to the attractive
forces between particles in liquids compared to solids?
a) They
are stronger
b) They
are weaker
c) They
are the same
Answer: b)
They are weaker
What shape do gases have?
a)
Definite shape
b) No
definite shape
Answer: b)
No definite shape
What volume do gases have?
a)
Definite volume
b) No
definite volume
Answer: b)
No definite volume
How are the particles arranged in
gases?
a) Closely
packed
b) Random
c) Loosely
packed
d) Fixed
Answer: c)
Loosely packed
Are the interparticle forces in
gases strong or weak?
a) Strong
b) Weak
Answer: b)
Weak
Can gases
move freely throughout a container?
a) Yes
b) No
Answer: a)
Yes.
Which type of matter has the
highest amount of empty spaces between particles?
a) Solids
b) Liquids
c) Gases
d) All
have the same amount
Answer: c)
Gases
What type of motion do particles in
gases have?
a)
Vibratory motion
b)
Rotational motion
c)
Translational motion
d)
Stationary
Answer: c)
Translational motion
Which type of matter has the
strongest interparticle forces?
a) Solids
b) Liquids
c) Gases
d) All
have the same strength
Answer: a)
Solids
What allows particles in liquids to
move past each other?
a) Strong
interparticle forces
b) Weak
interparticle forces
c) No
interparticle forces
d) Random
motion of particles
Answer: b)
Weak interparticle forces
Which type of matter takes the
shape of its container?
a) Solids
b) Liquids
c) Gases
d) None of
the above
Answer: b)
Liquids
Which type of matter has a definite
shape but not a definite volume?
a) Solids
b) Liquids
c) Gases
d) All
have a definite volume
Answer: c)
Gases
What is the regular ordered
arrangement of particles in solids called?
a) Lattice
b) Crystal
c)
Molecule
d) Atom
Answer: a)
Lattice
Which type of matter has a highly
ordered arrangement of particles?
a) Solids
b) Liquids
c) Gases
d) All
have the same arrangement
Answer: a)
Solids
What allows particles in liquids to
take the shape of their container?
a) Strong
interparticle forces
b) Weak
interparticle forces
c) No
interparticle forces
d)
Vibratory motion of particles
Answer: b)
Weak interparticle forces
What type of motion do particles in
solids have?
a)
Vibratory motion
b)
Rotational motion
c)
Translational motion
d)
Stationary
Answer: a)
Vibratory motion
Which of
the following is not a characteristic of gases?
a) Loosely
packed particles
b)
Definite shape
c) Definite
volume
d) Fast
particle movement
Answer: b)
Definite shape
What is the chemical classification
of matter based on?
a)
Physical properties
b)
Chemical properties
c)
Composition
d) Size
Answer: c)
Composition
What are the two main categories of
chemical composition of matter?
a) Solids
and liquids
b)
Mixtures and pure substances
c) Atoms
and molecules
d) Metals
and nonmetals
Answer: b)
Mixtures and pure substances
What is a pure substance?
a) A
substance with variable composition
b) A
substance with only one type of particle
c) A
substance with strong intermolecular forces
d) A
substance that is a liquid at room temperature
Answer: b)
A substance with only one type of particle
Can the constituents of pure
substances be separated by simple physical methods?
a) Yes
b) No
c)
Sometimes
d) It
depends on the substance
Answer: b)
No
What are the two subcategories of
pure substances?
a)
Elements and mixtures
b)
Compounds and mixtures
c)
Mixtures and solutions
d)
Elements and compounds
Answer: d)
Elements and compounds
Which of the following statements
defines an element?
A. A pure
substance containing more than one kind of element.
B. A
combination of two or more elements or compounds in any proportion so that the
components do not lose their identity.
C. A pure
substance which can be decomposed into simpler substances by chemical methods.
D. The
simplest form of a pure substance which can neither be decomposed into nor
built from simpler substances by ordinary physical or chemical methods.
Answer: D
Which of the following elements is
a metal?
A. Carbon
B.
Nitrogen
C. Oxygen
D. Copper
Answer: D
Which of the following statements
about compounds is true?
A. A
compound is a homogeneous mixture of two or more substances.
B. A
compound can be decomposed into its constituent elements by ordinary physical
or chemical methods.
C. A
compound always contains the same elements in varying proportions by weight.
D. The
properties of a compound are totally different from the elements from which it
is formed.
Answer: D
Which of the following is an
example of an inorganic compound?
A. Glucose
B. Sucrose
C. Common
salt
D. Starch
Answer: C
Which of the following is an
example of a heterogeneous mixture?
A. Air
B. Brass
C. Sugar
solution in water
D. Mixture
of iron filings, common salt, and sulfur
Answer: D
Which of the following statements
about homogeneous mixtures is true?
A. The
components of a homogeneous mixture can be seen even under a powerful
microscope.
B.
Homogeneous mixtures are also called solutions.
C. A
homogeneous mixture is said to be heterogeneous if its composition is not
uniform throughout.
D.
Homogeneous mixtures consist of two or more parts which have different
compositions.
Answer: B
Which of the following statements
about metals is true?
A. Metals
are generally non-lustrous and poor conductors of heat and electricity.
B. Metals
possess characteristics such as bright lustre, hardness, and ability to conduct
electricity and heat.
C. Metals
are generally malleable and ductile.
D. About
80% of the known elements are non-metals.
Answer: B
Which of the following statements
about metalloids is true?
A.
Metalloids are elements which have characteristics common to both metals and
non-metals.
B.
Metalloids are generally non-lustrous and poor conductors of heat and
electricity.
C.
Metalloids are generally malleable and ductile.
D.
Metalloids possess characteristics such as bright lustre, hardness, and ability
to conduct electricity and heat.
Answer: A
Which of the following statements
about mixtures is true?
A. A
mixture is a pure substance containing two or more than two elements combined
together in a definite proportion by mass.
B. A
mixture contains more than one kind of pure form of matter, known as substance.
C. The
composition of a mixture is always fixed and cannot be varied.
D. The
substances present in a mixture lose their identity.
Answer: B
(Easy)
Which of the following is an
example of an organic compound?
A. Common
salt
B. Carbon
dioxide
C. Marble
D.
Carbohydrates
Answer: D
(Easy)
What is the abbreviation used for
the International System of Units?
A) ISU
B) SI
C) IU
D) SU
Answer: B
When were the SI units adopted by
the General Conference of Weights and Measures?
A) 1950
B) 1960
C) 1970
D) 1980
Answer: B
How many base units are there in
the SI system?
A) Four
B) Five
C) Six
D) Seven
Answer: D
Which of the following is not one
of the base units in the SI system?
A) Meter
B) Kelvin
C) Gram
D) Second
Answer: C
What is the unit of temperature
according to the SI system?
A) Celsius
B) Fahrenheit
C) Kelvin
D) Rankine
Answer: C
How is the Celsius temperature
related to the Kelvin temperature?
A) Kelvin
temperature (K) = °C + 32
B) Kelvin
temperature (K) = 9/5(°C) + 32
C) Kelvin
temperature (K) = °C + 273.15
D) Kelvin
temperature (K) = °C - 273.15
Answer: C
Which of the following is not a
unit of length commonly used in chemistry?
A)
Angstrom (Ã…)
B)
Nanometer (nm)
C)
Picometer (pm)
D)
Micrometer (μm)
Answer: D
What is the size of an Angstrom (Ã…)
unit of length?
A) 10-9
m
B) 10-10
m
C) 10-11
m
D) 10-12
m
Answer: B
Which of the following is a valid
conversion between SI units?
A) 1 nm =
10-11 m
B) 1 pm =
10-9 m
C) 1 nm =
10-9 m
D) 1 pm =
10-10 m
Answer: C
Which of the following is not a
fundamental scientific quantity in the SI system?
A) Length
B) Mass
C) Time
D) Energy
Answer: D
What is the abbreviation used for
the unit of electric current in the SI system?
A) AC
B) DC
C) A
D) V
Answer: C
What is the abbreviation used for
the unit of luminous intensity in the SI system?
A) L
B) I
C) C
D) Cd
Answer: D
Which of
the following is the correct symbol for the unit of mass in the SI system?
A) m
B) kg
C) s
D) K
Answer: B
Which of the following is not a
valid SI prefix?
A) Mega
(M)
B) Kilo
(k)
C) Milli
(m)
D) Centi
(c)
E) Deca
(da)
Answer: E
Which of the following units is
commonly used to measure the amount of substance?
A) Mole
(mol)
B) Meter
(m)
C) Second
(s)
D) Kelvin
(K)
Answer: A
What does accuracy measure?
A) The
closeness of an experimental value to the mean value
B) The
difference between the experimental value and the true value
C) The
difference between the mean value and the true value
D) The
correctness of a measurement
Answer: B
If the mean value of different
measurements is close to the true value, what can be said about the measurement?
A) It is
precise
B) It is
accurate
C) It is
both precise and accurate
D) It is
neither precise nor accurate
Answer: B
What is precision a measure of?
A) The
difference between the mean value and the true value
B) The
difference between two or more measurements of the same quantity
C) The
correctness of a measurement
D) The
closeness of an experimental value to the mean value
Answer: B
What is the difference between
accuracy and precision?
A)
Accuracy measures the difference between the mean value and the true value,
while precision measures the difference between two or more measurements of the
same quantity
B)
Accuracy measures the correctness of a measurement, while precision measures
the closeness of an experimental value to the mean value
C)
Accuracy and precision are the same thing
D)
Accuracy measures the closeness of an experimental value to the mean value,
while precision measures the difference between the mean value and the true
value
Answer: A
When the true value of a quantity
is not known, what can be calculated instead of accuracy?
A) The
difference between the mean value and the true value
B) The
difference between two or more measurements of the same quantity
C) The
correctness of a measurement
D) The
precision of the measurements
Answer: D
What is the difference between the
two methods (A and B) used to analyze the sample of a compound?
A) Method
A gives a larger mean value than method B
B) Method
B gives a larger mean value than method A
C) Method
A gives a more precise result than method B
D) Method
B gives a more accurate result than method A
Answer: D
Which unit is not a base unit of
the International System of Units (SI)?
A)
Kilogram
B) Candela
C)
Angstrom
D) Second
Answer: C
What is the relationship between
Celsius and Kelvin temperature scales?
A) 0
degrees Celsius is equal to 0 Kelvin
B) 0
degrees Celsius is equal to -273.15 Kelvin
C) 0
degrees Celsius is equal to 273.15 Kelvin
D) 100
degrees Celsius is equal to 373.15 Kelvin
Answer: C
Which unit
is commonly used as a unit of length in chemistry and is almost the same size
as the size of an atom?
A)
Nanometer (nm)
B)
Picometer (pm)
C)
Angstrom (Ã…)
D) Meter
(m)
Answer: C
How many base units does the
International System of Units (SI) have?
A) Four
B) Five
C) Six
D) Seven
Answer: D
What is the purpose of expressing
large or small numbers in scientific notation?
a) To make
them easier to write down
b) To make
them sound more scientific
c) To make
them more accurate
d) To make
them harder to understand
Answer: a)
To make them easier to write down
What is the general form of a
number expressed in scientific notation?
a) N ×
10n, where N is a single non-zero digit and n is an exponent having positive or
negative values
b) N ×
10n, where N is a single zero digit and n is an exponent having positive or
negative values
c) N ×
10n, where N is any number and n is an exponent having positive or negative
values
d) N ×
10n, where N is a single non-zero digit and n is an exponent having only
positive values
Answer: a)
N × 10n, where N is a single non-zero digit and n is an exponent having
positive or negative values
What is the value of the exponent
for the number 246.38 when expressed in scientific notation?
a) 2
b) 3
c) 4
d) 5
Answer: b)
3
How is the exponent determined when
expressing a number in scientific notation?
a) By
counting the number of digits in the number
b) By
adding or subtracting the number of decimal places the decimal point is moved
c) By
rounding the number to the nearest power of 10
d) By
multiplying the number by a fixed exponent value
Answer: b)
By adding or subtracting the number of decimal places the decimal point is
moved
What is the scientific notation of
the number 0.00014872?
a) 1.4872
× 10-5
b) 1.4872
× 10-4
c) 1.4872
× 10-3
d) 1.4872
× 10-2
Who postulated the law of
conservation of mass?
a. Isaac
Newton
b. Antoine
Lavoisier
c. Albert
Einstein
d. Galileo
Galilei
Answer: b
What is the law of conservation of
mass?
a. During
any chemical change, the total mass of the products is less than the total mass
of the reactants.
b. During
any physical or chemical change, the total mass of the products is greater than
the total mass of the reactants.
c. During
any physical or chemical change, the total mass of the products is equal to the
total mass of the reactants.
d. During
any chemical change, the total mass of the products is not related to the total
mass of the reactants.
Answer: c
What is another name for the law of
conservation of mass?
a. Law of
Physical Change
b. Law of
Chemical Change
c. Law of
Indestructibility of Matter
d. Law of
Inertia
Answer: c
What is Landolt’s experiment used
for?
a. To
verify the law of conservation of energy
b. To
verify the law of conservation of mass
c. To
determine the melting point of a substance
d. To
determine the boiling point of a substance
Answer: b
What happens when sodium chloride
and silver nitrate are mixed together?
a. A red
ppt. of silver chloride is formed.
b. A blue
ppt. of silver chloride is formed.
c. A white
ppt. of silver chloride is formed.
d. A green
ppt. of silver chloride is formed.
Answer: c
According to John Dalton's atomic
theory, matter is made up of extremely small indivisible and indestructible
ultimate particles called:
A. Atoms
B.
Molecules
C. Protons
D.
Electrons
Answer: A
According to the theory, atoms of
the same element are identical in all respects including:
A. Shape
B. Size
C. Mass
D.
Chemical properties
E. All of
the above
Answer: E
Atoms of different elements are
different in all respects and have different:
A. Masses
B.
Chemical properties
C. Shapes
D. Sizes
E. A and B
Answer: E
What is the smallest unit that
takes part in chemical combinations according to the theory?
A.
Molecule
B. Atom
C.
Electron
D. Proton
Answer: B
According to John Dalton's atomic
theory, atoms of two or more elements combine in a fixed ratio to form:
A.
Molecules
B.
Compounds
C.
Solutions
D.
Mixtures
Answer: B
According to the theory, can atoms
be created or destroyed during any physical or chemical change?
A. Yes,
they can be created or destroyed
B. No, they
can neither be created nor destroyed
C. Only in
physical changes
D. Only in
chemical changes
Answer: B
What do chemical reactions involve
according to the theory?
A. Only
combination
B. Only
separation
C. Only
rearrangement
D.
Combination, separation, or rearrangement of atoms
Answer: D
Which of the following is NOT a
basic postulate of John Dalton's atomic theory?
A. Atoms
of the same element are identical in all respects.
B. Atoms
can neither be created nor destroyed during any physical or chemical change.
C. Atoms
of different elements are different in all respects and have different masses
and chemical properties.
D. Atoms
are the smallest unit of matter.
E. Atoms
of different elements have the same mass.
Answer: E
What are atoms of the same element
identical in according to the theory?
A. Mass
only
B. Size
and shape only
C.
Chemical properties only
D. All
respects
Answer: D
According to the theory, what do
atoms of two or more elements combine in to form compound atoms?
A. Fixed
mass
B. Fixed
ratio
C.
Variable mass
D.
Variable ratio
Answer: B
Why did Dalton's atomic theory
become significant in the beginning of the 19th century?
A. It gave
a powerful initiative to scientists
B. It
explained the laws of gaseous volumes
C. It
explained the laws of chemical combination by mass and gaseous volumes
D. It
failed to explain any laws of chemical combination
Answer: A
What was the main achievement of
Dalton's atomic theory?
A. It
explained the laws of chemical combination
B. It
explained why atoms of different elements have different masses and sizes
C. It
explained the nature of forces that bind atoms together in a molecule
D. It
explained how and why atoms of different elements combine to form molecules
Answer: A
What are the main drawbacks of Dalton's
atomic theory?
A. It
failed to explain the law of gaseous volumes and the nature of forces that bind
together atoms in a molecule
B. It
could explain the laws of chemical combination but not the law of gaseous
volumes
C. It
could not explain how atoms of different elements combine to form compound
atoms or molecules
D. It gave
no satisfactory explanation between the ultimate particle of an element and
that of a compound
E. All of
the above
Answer: E
According to the theory, what could
it not explain regarding atoms of different elements?
A. Masses
B. Sizes
C.
Valencies
D. All of
the above
Answer: D
Why did Dalton's atomic theory
become outdated and modified in the 20th century?
A. Due to
the discovery of laws of gaseous volumes
B. Due to
the discovery of the nature of forces that bind atoms together in a molecule
C. Due to
the discovery of electrons, protons, and neutrons
D. Due to
the discovery of the ultimate particle of an element and that of a compound
Answer: C
What are subatomic particles?
a)
particles that are smaller than atoms
b)
particles that are larger than atoms
c)
particles that make up atoms
d)
particles that have no relation to atoms
Answer: c)
particles that make up atoms
What are isotopes?
a) atoms
of different elements with different atomic masses
b) atoms
of the same element with different atomic masses
c) atoms
that possess the same mass but have different chemical properties
d) atoms
that possess the same properties but have different masses
Answer: b)
atoms of the same element with different atomic masses
What are isobars?
a) atoms
of different elements with different atomic masses
b) atoms
of the same element with different atomic masses
c) atoms
that possess the same mass but have different chemical properties
d) atoms
that possess the same properties but have different masses
Answer: a)
atoms of different elements with different atomic masses
Which of the following statements
is true about the smallest particle that takes part in chemical reactions?
a) It is
made up of subatomic particles.
b) It is
not composed of subatomic particles.
c) It is
larger than atoms.
d) It is
not involved in chemical reactions.
Answer: a)
It is made up of subatomic particles.
What is transmutation?
a) The
process of converting atoms of one element into atoms of another element.
b) The
process of converting atoms into subatomic particles.
c) The
process of converting subatomic particles into atoms.
d) The
process of converting energy into mass.
Answer: a)
The process of converting atoms of one element into atoms of another element.
According to Einstein’s equation,
what is interconvertible?
a) Mass
and energy
b)
Subatomic particles and energy
c) Atoms
and energy
d) Mass
and subatomic particles
Answer: a)
Mass and energy
What happens to the atom during
chemical reactions?
a) It is
changed into atoms of other elements.
b) It is
indestructible.
c) Its
mass is converted into energy.
d) It is
composed of subatomic particles.
Answer: b)
It is indestructible.
What is
the ultimate particle of an element called?
a.
Molecule
b.
Compound
c. Atom
d. Element
Answer: c.
Atom
What happens if we keep on breaking
a particle of an element?
a. It
becomes smaller and smaller until it disappears
b. It
becomes a molecule
c. It
becomes a compound
d. It
becomes an ion
Answer: a.
It becomes smaller and smaller until it disappears
Are all elements composed of atoms?
a. Yes
b. No
Answer: a.
Yes
Which of the following elements is
capable of independent existence?
a. Oxygen
b.
Nitrogen
c. Helium
d. Carbon
Answer: c.
Helium
What is the ultimate particle of a
chemical compound called?
a. Atom
b.
Molecule
c. Element
d. Ion
Answer: b.
Molecule
How many types of atoms are there?
a. 118
b. 100
c. 90
d. 200
Answer: a.
118
Which of the following elements is
not capable of independent existence?
a. Helium
b.
Nitrogen
c. Oxygen
d. Carbon
Answer: b.
Nitrogen
What happens when two or more atoms
of different elements combine?
a. A
compound is formed
b. An
element is formed
c. A
molecule is formed
d. An ion
is formed
Answer: a.
A compound is formed
What are homoatomic molecules?
a.
Molecules made up of atoms of different elements
b.
Molecules made up of atoms of the same element
c.
Molecules made up of ions
d.
Molecules made up of isotopes
Answer: b.
Molecules made up of atoms of the same element
Which of the following gases is not
a homoatomic molecule?
a.
Hydrogen gas
b.
Chlorine gas
c.
Nitrogen gas
d. Carbon
dioxide
Answer: d.
Carbon dioxide
What is the atomicity of a
monoatomic molecule?
a. One
b. Two
c. Three
d. Four
Answer: a.
One
Which of the following is a
triatomic molecule?
a. O2
b. H2
c. O3
d. N2
Answer: c.
O3
What is the atomicity of a
polyatomic molecule?
a. One
b. Two
c. Three
d. More
than three
Answer: d.
More than three
What is the atomicity of N2?
a. Monoatomic
b.
Diatomic
c.
Triatomic
d.
Polyatomic
Answer: b.
Diatomic
Which of the following is a
polyatomic molecule?
a. He
b. Ne
c. O3
d. H2
Answer: c.
O3
What is the atomicity of P4?
a.
Monoatomic
b.
Diatomic
c.
Triatomic
d.
Tetraatomic
Answer: d.
Tetraatomic
What is the meaning of the term
"atomicity"?
a. The
number of atoms in a molecule of an element
b. The
number of protons in an atom
c. The
number of neutrons in an atom
d. The
number of electrons in an atom
Answer: a.
The number of atoms in a molecule of an element
Which of the following gases is a
diatomic molecule?
a. Carbon
monoxide
b. Methane
c.
Hydrogen chloride
d. Oxygen
Answer: d.
Oxygen
What is the atomicity of S8?
a.
Monoatomic
b.
Diatomic
c.
Triatomic
d.
Polyatomic
Answer: d.
Polyatomic
Which of the following gases is a
monoatomic molecule?
a.
Nitrogen
b. Oxygen
c. Helium
d. Carbon
dioxide
Answer: c.
Helium
What is the atomicity of O2?
a.
Monoatomic
b.
Diatomic
c.
Triatomic
d.
Polyatomic
Answer: b.
Diatomic
What is the atomicity of H2?
a.
Monoatomic
b.
Diatomic
c.
Triatomic
d.
Polyatomic
Answer: b.
Diatomic
What is a heteroatomic molecule?
a. A
molecule made up of atoms of the same element
b. A
molecule made up of atoms of different elements
c. A
molecule with only one atom
d. A molecule
with more than three atoms
Answer: b.
A molecule made up of atoms of different elements
Which of
the following is a heteroatomic molecule?
a. Oxygen
gas
b. Neon
gas
c. Water
d.
Nitrogen gas
Answer: c.
Water
What is the atomicity of PCl5?
a. Monoatomic
b.
Diatomic
c.
Triatomic
d.
Polyatomic
Answer: d.
Polyatomic
Which of the following is not a
heteroatomic molecule?
a. Carbon
monoxide
b. Ammonia
c. Methane
d.
Hydrogen gas
Answer: d.
Hydrogen gas
What is the atomicity of CO2?
a.
Monoatomic
b.
Diatomic
c.
Triatomic
d.
Polyatomic
Answer: d.
Polyatomic
Which of the following is a
triatomic molecule?
a. Oxygen
gas
b. Carbon
dioxide
c. Ammonia
d.
Hydrogen chloride
Answer: c.
Ammonia
What is the ultimate particle of an
element called?
A)
Molecule
B) Atom
C)
Compound
D) Element
Answer: B)
Atom
Which of the following elements are
capable of independent existence?
A)
Hydrogen
B) Oxygen
C)
Nitrogen
D) Helium
E) Neon
F) Argon
Answer: D)
Helium, E) Neon, F) Argon
What is the term used to classify
molecules based on the number of atoms they contain?
A)
Atomicity
B) Isotopy
C)
Ionicity
D)
Covalency
Answer: A)
Atomicity
What is the standard substance used
to express atomic masses?
A) Oxygen
B)
Carbon-12
C)
Hydrogen
D)
Chlorine
Answer: B)
Carbon-12
What is the definition of atomic
mass?
A) The
mass of an atom of an element compared to the mass of an atom of hydrogen
B) The
mass of an atom of an element compared to the mass of an atom of carbon-12
C) The
mass of an atom of an element compared to the mass of an atom of oxygen
D) The
mass of an atom of an element compared to the mass of an atom of chlorine
Answer: B)
The mass of an atom of an element compared to the mass of an atom of carbon-12
What is a mole?
a) A unit
for counting atoms, molecules, ions, etc.
b) A small
animal that burrows underground
c) A type
of sauce used in Mexican cuisine
d) A type
of bird found in North America
e) A unit
for measuring length
Answer: a)
A unit for counting atoms, molecules, ions, etc.
What is the Avogadro number?
a) The
number of apples in a dozen
b) The
number of birds in a flock
c) The
number of particles in a mole
d) The
number of stars in the Milky Way galaxy
e) The
number of bones in the human body
Answer: c)
The number of particles in a mole
Who is Amedeo Avogadro?
a) An
Italian chef known for his pasta dishes
b) An
Italian painter famous for his landscapes
c) An
Italian scientist who discovered the Avogadro number
d) An
Italian politician who served as Prime Minister
e) An
Italian singer who won the Eurovision Song Contest
Answer: c)
An Italian scientist who discovered the Avogadro number
What is the relationship between a
mole and Avogadro's number?
a) A mole
is a type of animal that Avogadro studied
b) A mole
is equal to Avogadro's number of particles
c) A mole
is a unit of length used by Avogadro
d) A mole
is a type of currency used in Avogadro's country
e) A mole
is a type of food that Avogadro enjoyed
Answer: b)
A mole is equal to Avogadro's number of particles
What is the significance of using
the unit mole in chemistry?
a) It
allows chemists to count atoms, molecules, ions, etc. easily
b) It is a
traditional unit of measurement
c) It is a
unit used only by chemists
d) It is a
unit that is no longer used in modern chemistry
e) It is a
unit used only for measuring length
Answer: a)
It allows chemists to count atoms, molecules, ions, etc. easily
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