IGCSE/GCSE/O & A Level/IB/University Student Forum

Qualification => Subject Doubts => GCE AS & A2 Level => Sciences => Topic started by: The SMA on May 11, 2010, 09:57:09 am

Title: need explanations on Chemistry cie
Post by: The SMA on May 11, 2010, 09:57:09 am

hey guys, what does enthalphy changes of vaporisation means?
n why does its related to indicate the relative strength of
hydrogen bonds between the molecules in liquid Hydrogen halide?

Title: Re: need explanations on Chemistry cie
Post by: cashem'up on May 11, 2010, 11:34:06 am

the enthalpy of vaporisation is the energy change required in order to form 1 mole of vaporised products............. now as we know when something vaporises INTERMOLECULAR FORCES ARE BROKEN...... now in  hydrogen halides there is presence of dipole-dipole forces between molecules which are broken during vaporisation and thus if the enthalpy change is more positive then the bonds must have been more stronger......

hope it helps thx :P

Title: Re: need explanations on Chemistry cie
Post by: The SMA on May 11, 2010, 11:08:34 pm

thaaaaanks ima shah
really really appreciate it! :)

Title: Re: need explanations on Chemistry cie
Post by: cashem'up on May 12, 2010, 05:26:43 am

no probs
 ;D ;D ;D