interconversions Flashcards
liquid to solid
freezing
releases energy
solid to liquid
melting
requires energy
liquid to gas
boiling/ evaporation
requires energy
gas to liquid
condensation
releases energy
gas to solid
deposition
releases energy
solid to gas
sublimation
requires energy
melting
the conversion of 1solid to liquids which occurs at the 2melting point with the use of 3latent heat
added heat of fusion causes particles to gain more kinetic energy and intermolecular forces to weaken causing the particles to rotate more around each other and break away from their fixed positions
there is not an increase of temperature but in energy
what is latent heat
hidden heat as temperature does not rise when melting the solid
heat applied with no temperature change
what is heat of fusion
energy required to melt a solid
how many states present during a change of state
two
what is the boiling point 2
particular temperature at which boiling takes place
does not change during process or change of state
what is waters boiling point
100 degrees celcius
define boiling
change of state from water to gas with the use of heat where particles gain energy and bump into each other more often and bounce further apart which is the liquid expanding
what kind of heat is involved in boiling
latent heat of vaporization to overcome forces in liquid and not raise the temperature
define boiling 2
rapid
gas bubbles projected throughout
set temperature
define evaporation
slow
occurs at surface
no bubbling
state 3 differences between boiling and evaporation
evap takes place over range of temp under bp
occurs at surface
results in cooling
boiling takes place at a fixed temperature
occurs throughout
remains constant
sublimation give 5 examples
iodine ammonium chloride dry ice moth balls
which substances have fixed boiling/melting point
pure substances
what does the addition of impure substances do?
depresses or lowers melting/freezing point of a substance or boiling points
state melting, freezing and boiling points of pure h2o
melts at 0 degrees Celsius
freezes at 0 degrees celsius
boils at 100 degrees celsius
