energetics

• SEC of rxn

  the enthalpy change when molar quantities of reactants as specified by chemical equation react to form products at 1 atmosphere and 298k temperature
• SEC of fmth

  the enthalpy change when 1 mol of a pure cmpd in a specified state is formed from its constituent elements in their standard states, at 1 atmosphere and 298k temperature
• SEC of combustion

  the heat energy released when 1 mol of substance is completely burned in oxygen at 1 atmosphere and 298k temperature
• SEC of hyd

  the heat energy released when 1 mol of gaseous ion is dissolved in large amt of water at 1 atmosphere and 298k temperature
• SEC of soln

  the heat change when 1 mol of solute is completely dissolved in enough solvent so that no more heat change takes place on adding more solvent at 1 atmosphere and 298k temperature
• sec of neut

  the heat change when an amount of acid neutralises a base to form 1 mol of water at 1 atmosphere and 298k temperature
• sec of atom

  the enthalpy change when 1 mol of atoms in gas phase is formed from the element in the defined physical state at 1 atmosphere and 298k temperature
• bond energy 


  average energy required when 1 mol of X-Y bond is broken in gaseous state
• bond dissociation energy


  energy required to break 1 mol of particular X-Y bond in a particular compound in gaseous state
• LE

  enthalpy change when 1 mol of a pure solid ionic cmpd is formed from its constituent gaseous ions at 1 atmosphere and 298k temperature
• 1st IE


  energy required to remove 1 mol of e- from 1 mol of gaseous X atoms to form 1 mol of gaseous X+ ions
• 1st EA is exothermic because

  the attraction between the nucleus of O atom and the added electron is greater than the repulsion between the electrons. 2nd EA is endothermic because energy is required to overcome the repulsion when electron are added to a negatively charged O ion.