AFOQT Physical Science Exam Questions And
Accurate Answers
Absolute Zero The lowest possible temperature - ANSWER Absolut Zero
The pressure exerted by the gases in the air. units of measurement are kilopascals,
atmospheres, millimeters of mercury, and Torr - ANSWER atmospheric Pressure
Pressure is 100 kPa, 1atm, 760 mm Hg or 760 Torr - ANSWER standard atmospheric
pressure
the smallest particle of an element a nucleus and its surrounding electrons. - ANSWER
Atom
the mass of an atom measured in atomic mass units (amu). one atomic mass unit is
equal to one-twelfth of the atom of carbon-12. atomic mass is now more generally used
instead of atomic weight. Example: the atomic mass of chlorine is about 35amu. -
ANSWER atomic mass
Atomic Number The number of electrons or number of protons within an atom. Example:
The atomic number of gold is 79. - ANSWER atomic number
A general term that refers to the average molar mass of an element. This is the mass per
mole of atoms. Ex: The atomic weight of chlorine is about 35g/mol - ANSWER atomic
weight
The temperature at which a substance changes phase from liquid to gas. - ANSWER
boiling point.
, A temperature scale in which water freezes at 0\ degrees and normal boiling point at
standard atmospheric pressure is 100\ degrees. - ANSWER celsius scale
a change between two of the three states of matter, solid, liquid and gas. example when
water evaporates t changes from a liquid to a gaseous state. - ANSWER change of state.
a chemical consisting of two or more elements chemically bonded together. example:
calcium can combine with carbon and oxygen to make calcium carbonate a compound
of all three elements. - ANSWER compound
the process that occurs when a liquid forms from a gas. this is a change of state, also
called a phase change. - ANSWER condensation
the flow or transfer of heat (heat conduction) by direct contact with another body or by
allowing the flow of electrons (electrical conduction) - ANSWER conduction
the transfer of heat energy to the surroundings brought on by the movement of a fluid
due to being heated or cooled. - ANSWER convection
the process by which a radio-active element is transformed into another element
through the emission of Example: uranium 238 decays through the emission of an alpha
particle to form thorium 234. - ANSWER decay
the mass per unit volume - ANSWER density
the process in which one substance gradually mixes with another until the two
substances are uniformly mixed. mixing takes place as a consequence of the
differences in concentration within the mixture. _______ acts quickly in gases, very
slowly in liquids. - ANSWER diffusion
to break down a substance in a solution without causing a reaction - ANSWER dissolve
Accurate Answers
Absolute Zero The lowest possible temperature - ANSWER Absolut Zero
The pressure exerted by the gases in the air. units of measurement are kilopascals,
atmospheres, millimeters of mercury, and Torr - ANSWER atmospheric Pressure
Pressure is 100 kPa, 1atm, 760 mm Hg or 760 Torr - ANSWER standard atmospheric
pressure
the smallest particle of an element a nucleus and its surrounding electrons. - ANSWER
Atom
the mass of an atom measured in atomic mass units (amu). one atomic mass unit is
equal to one-twelfth of the atom of carbon-12. atomic mass is now more generally used
instead of atomic weight. Example: the atomic mass of chlorine is about 35amu. -
ANSWER atomic mass
Atomic Number The number of electrons or number of protons within an atom. Example:
The atomic number of gold is 79. - ANSWER atomic number
A general term that refers to the average molar mass of an element. This is the mass per
mole of atoms. Ex: The atomic weight of chlorine is about 35g/mol - ANSWER atomic
weight
The temperature at which a substance changes phase from liquid to gas. - ANSWER
boiling point.
, A temperature scale in which water freezes at 0\ degrees and normal boiling point at
standard atmospheric pressure is 100\ degrees. - ANSWER celsius scale
a change between two of the three states of matter, solid, liquid and gas. example when
water evaporates t changes from a liquid to a gaseous state. - ANSWER change of state.
a chemical consisting of two or more elements chemically bonded together. example:
calcium can combine with carbon and oxygen to make calcium carbonate a compound
of all three elements. - ANSWER compound
the process that occurs when a liquid forms from a gas. this is a change of state, also
called a phase change. - ANSWER condensation
the flow or transfer of heat (heat conduction) by direct contact with another body or by
allowing the flow of electrons (electrical conduction) - ANSWER conduction
the transfer of heat energy to the surroundings brought on by the movement of a fluid
due to being heated or cooled. - ANSWER convection
the process by which a radio-active element is transformed into another element
through the emission of Example: uranium 238 decays through the emission of an alpha
particle to form thorium 234. - ANSWER decay
the mass per unit volume - ANSWER density
the process in which one substance gradually mixes with another until the two
substances are uniformly mixed. mixing takes place as a consequence of the
differences in concentration within the mixture. _______ acts quickly in gases, very
slowly in liquids. - ANSWER diffusion
to break down a substance in a solution without causing a reaction - ANSWER dissolve
