energetics Flashcards
1
Q
State the meaning of the term standard enthalpy of combustion
A
Enthalpy change when one mole of a substance burns completely in oxygen
2
Q
Define the term enthalpy change.
A
Heat (energy) change at constant pressure
3
Q
why is enthlapy of combustion less exothermic
A
- due to incomplete combustion
-heat loss to surroundings
4
Q
what is enthlapy of formation
A
the enthlapy change when one mole of a substance is produced from its elements under standard conditions
5
Q
what is the equation to find heat change
A
q/mole
q=change in temp x m x c
6
Q
what is calorimetry
A
is an experimental method for for finding enthlapy change by doing change of temperature over time
7
Q
what is bond enthlapy
A
the energy required to break one mole of the stated bond in a gaseous state ,under standard conditions
