CHAPTER 9- HEAT AND
THERMODYNAMICS KEY TERMS EXAM
QUESTIONS AND ANSWERS 2025
solidifies - ANSWER-a phase change from liquid to solid or gas to solid (freezing or
deposition)
evaporate - ANSWER-a phase change from liquid to gas
condense - ANSWER-a phase change from gas to liquid
sublimate - ANSWER-a phase change from solid to gas
deposition - ANSWER-a phase change from gas to solid
specific heat - ANSWER-the amount of heat required to cause a unit of mass (say a
gram or a kilogram) to change its temperature by 1°C
thermal equilibrium - ANSWER-the condition under which two substances in physical
contact with each other exchange no heat energy
latent heat of transformation - ANSWER-the heat given up or absorbed by a unit mass
of a substance as it changes from a solid to a liquid, from a liquid to a gas, or the
reverse of either of these changes
heat of fusion - ANSWER-measures the amount of energy needed to melt a given mass
of a solid at its melting point temperature
heat of vaporization - ANSWER-the quantity of heat required at a specified temperature
to convert unit mass of liquid into vapor
conduction - ANSWER-the process by which heat or electricity is directly transmitted
through a substance when there is a difference of temperature or of electrical potential
between adjoining regions, without movement of the material
convection - ANSWER-the movement caused within a fluid by the tendency of hotter
and therefore less dense material to rise, and colder, denser material to sink under the
influence of gravity, which consequently results in transfer of heat
radiation - ANSWER-the emission of energy as electromagnetic waves or as moving
subatomic particles, especially high-energy particles which cause ionization
THERMODYNAMICS KEY TERMS EXAM
QUESTIONS AND ANSWERS 2025
solidifies - ANSWER-a phase change from liquid to solid or gas to solid (freezing or
deposition)
evaporate - ANSWER-a phase change from liquid to gas
condense - ANSWER-a phase change from gas to liquid
sublimate - ANSWER-a phase change from solid to gas
deposition - ANSWER-a phase change from gas to solid
specific heat - ANSWER-the amount of heat required to cause a unit of mass (say a
gram or a kilogram) to change its temperature by 1°C
thermal equilibrium - ANSWER-the condition under which two substances in physical
contact with each other exchange no heat energy
latent heat of transformation - ANSWER-the heat given up or absorbed by a unit mass
of a substance as it changes from a solid to a liquid, from a liquid to a gas, or the
reverse of either of these changes
heat of fusion - ANSWER-measures the amount of energy needed to melt a given mass
of a solid at its melting point temperature
heat of vaporization - ANSWER-the quantity of heat required at a specified temperature
to convert unit mass of liquid into vapor
conduction - ANSWER-the process by which heat or electricity is directly transmitted
through a substance when there is a difference of temperature or of electrical potential
between adjoining regions, without movement of the material
convection - ANSWER-the movement caused within a fluid by the tendency of hotter
and therefore less dense material to rise, and colder, denser material to sink under the
influence of gravity, which consequently results in transfer of heat
radiation - ANSWER-the emission of energy as electromagnetic waves or as moving
subatomic particles, especially high-energy particles which cause ionization
