Bond enthalpies

• What is a bond enthalpy?

  The amount of energy needed to break a particular bond
• What is another name for the bond enthalpy?

  bond dissociation enthalpy
• What is mean bond enthalpy?

  the average value of bond enthalpy for a particular bond in a range of compunds.
• What is bond dissociation enthalpy?

  the energy required to break a particular covalent bonds in 1 mole of molecules in the gaseous stage.
• How do you calculate enthalpy change from mean bond enthalpies?

  $\Delta H$ r = $\sum_{ }^{ }$ bonds broken - $\sum_{ }^{ }$ bonds made
• What is the process for making bonds?

  Endothermic
• What is the process for breaking bonds?

  Exothermic