Bond enthalpies
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8 Terms
What are bond enthalpies?
Bond enthalpy is the energy needed to break a bond. Bond enthalpies have specific values that differ depending on which atoms are attached on either side of the bond.
Is breaking bonds endothermic or exothermic?
Endothermic
Is forming bonds exothermic or endothermic?
Exothermic
What is mean bond enthalpy?
The average energy needed to break a certain type of bond, over a range of compounds
What is the equation to calculate the enthalpy change of a reaction?
Total energy absorbed - total energy released
What is the standard enthalpy change of formation?
The enthalpy change when 1 mole of a compound is formed form its constituent elements in their standard states under standard conditions
What is the standard enthalpy change of combustion?
The enthalpy change when 1 mole of a substance is completely burned in oxygen under standard conditions with all reactants and products in their standard states
What is the standard enthalpy change of reaction?
The enthalpy change when a reaction occurs in the molar quantities shown in the chemical equation, under standard conditions with all reactants and products in their standard states
Note 
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