Enthalpy Flashcards
1
Q
Standard Enthalpy of Formation Definition
A
Enthalpy change when 1 mole of substance is formed from its constituent elements under standard conditions, in their standard states
2
Q
Standard Enthalpy of Combustion
A
Enthalpy change when one mole of a substance is burnt completely in oxygen under standard conditions.
3
Q
Bond enthalpy definition
A
the enthalpy change when 1 mole of the bonds are broken to give separated atoms in the gas state
4
Q
When are bond enthalpies positive?
A
In endothermic reactions as energy is needed to break bonds
