Unit 3: Enthalpy of combustion Flashcards
1
Q
Define combustion
A
burning
2
Q
Is combustion always negative or positive
A
negative
3
Q
Is combustion exo or endo
A
Exothermic
4
Q
Define enthalpy of combustion
A
The energy released when 1 mole of a substance burns completely in oxygen
5
Q
How do you calculate the energy released?
A
Eh=c x m x deltaT
6
Q
How do you calculate enthalpy of combustion?
A
Eh= c x m x deltaT
cross multiply
7
Q
Why is the theoretical energy change different in real life?
A
due to energy lost
8
Q
How is energy lost?
A
heat lost to surroundings
incomplete combusion
9
Q
Define enthalpy of solution
A
the energy change when 1 mole of a substance dissolves completely in water
10
Q
Is enthalpy of solution endo or exo?
A
Can be both
