energetics Flashcards
1
Q
energy transferred equation
A
Q=mc^t
Q=heat energy
m= mass (kg)
c= specific heat capacity
t= temperature (k)
2
Q
breaking bonds
A
energy absorbed (endothermic)
^H is positive
more energy is needed to break bonds than energy given out when bonds are formed
3
Q
exothermic reaction
A
reaction that releases energy to surroundings
products lower in energy than reactions
^H is negative
4
Q
enthalpy change equation
A
total energy to break bonds - total energy released forming bonds
5
Q
enthalpy change
A
the heat change in a reaction at constant pressure
standard conditions: 100kpa
298k
6
Q
enthalpy
A
when a chemical reaction occurs there’s normally a change in energy
