chemistry 8.4 - bond enthalpy
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5 Terms
Is bond breaking endothermic or exothermic?
Endothermic as requires energy
What does bond enthalpy mean?
The amount of energy required to break 1 mole of a type of bond in a molecule in the gas phase
Do the same bonds always require the same energy to break?
No, 2 of the same bonds in the same molecule can have different energies required due to differences in electron repulsion. The same bond in different molecules can also require different energies to break
What are mean bond enthalpies?
The energy needed to break 1 mole of bonds in the gas phase, averaged over many different compounds
What is the equation to work out the enthalpy change of a reaction?
Sum of reactants’ bond enthalpies - sum of products’ bond enthalpies
Note 
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