5.1 Thermochemistry Flashcards
Fission
The splitting of a
unstable, large atomic mass nuclei
into two or more smaller, stabler
nuclei
➢ Accomplished by firing a
neutron at the nuclei
➢ We also access this via nuclear
energy production
Fusion
the combination
of two or more low mass atomic
nuclei under the influence of
immense pressure and temperature
open system
matter and energy can move in or out
closed system
matter cant move but energy can
isolated system
matter and energy are not free to move
temperature
average kinetic energy
heat
thermal energy transferred between two systems
thermal energy
total kinetic and potential energy
potential energy
stored energy
kinetic energy
energy associated with movement
energy
ability to do work
work
energy transfer when a force moves an object a distance
specific heat capacity
quantity of thermal energy required to heat 1 g of a substance up 1 degree
q
heat transferred in joules, mcchangeint
enthalpy change
the energy released to or absorbed by the
surroundings during a physical or chemical change at constant pressure
bond dissosociation energy
how much energy the bond has to absorb to
then break
weird groups
P4, Se8, S8
gases
all noble gases, hydrogen, oxygen, nitrogen,
fluorine and chlorine
liquids
mercury and bromine
solids
everything but mercury and bromine noble gases, hydrogen, oxygen, nitrogen,
fluorine and chlorine
molar enthalpy of solution
Hsol
molar enthalpy of combustion
Hcomb
molar enthalpy of vaporization
Hvap
molar enthalpy of freezing
Hfr
