thermochemistry/ calrometry Flashcards
what is thermochemistry?
study of the role of heat in physical & chemical changes.
what is enthalpy?
- heat
- sum of kinetic & chemical energies for a system
what’s a system?
the thing your working with
what is temperature?
measure of a system’s kinetic energy
what is kinetic?
energy of motion
Q=mc deltaT
things to remember..?
q- quantity of kinetic energy (J)
m- mass in g
c- specific heat capacity (J/g°C)
delta- change/ difference in
t- temperature
mass n capacity must always be +
what is specific heat capacity?
how much energy it takes to heat something
what is endothermic?
use to determine system
-energy absorbed
-Q>0; TF>To
- increase in temp
what is exothermic?
use to determine system
-energy released
-Q<0;TF<To
-decrease in temp
what is chemical potential energy?
energy stores in chemical bonds
cannot be measured directly
deltaH=ndeltaHm
deltaH- enthalpy change (kJ)
n- # of moles (mol)
deltaHm- molar enthalpy of change (kj/mol)
what is fusion?
melting
(solid to liquid state)
endo
what is evaporation/vaporizing?
boiling
(liquid to gas state)
endo
what is sublimation?
dry ice-solid CO2
solid to gas state
endothermic
what is solidification?
freezing
(liquid to solid state)
exo
