chemical energy 3.4 Flashcards
1
Q
enthalpy of combustion of a substance
A
the enthalpy change which one mole of the substance burns completely in oxygen
2
Q
is the enthalpy change always positive or negative for a combustion reaction
A
negative
3
Q
enthalpy change symbol
A
delta H
4
Q
enthalpy change calculation
A
Eh = cm delta T
5
Q
enthalpy of combustion calculation
A
(Eh/mass burned) x gfm
6
Q
hess’s law
A
the enthalpy change for a chemical reaction is independent of the route taken
7
Q
molar bonds enthalpy
A
the energy required to break one mole of bonds in a diatomic molecule
8
Q
mean bond enthalpy
A
the average energy required to break one mole of a bond that occurs in a number of molecules
9
Q
enthalpy
A
the energy stored within molecules
10
Q
enthalpy change
A
the energy change when a reaction occurs
