CHAPTER 6 ENTHALPY CHANGES SEMESTER 1

       

                                

 

MEASURING ENTHALPY CHANGES

 

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The enthalpy change for an endothermic reaction is always positive.

The enthalpy change for an exothermic reaction is always negative.

Enthalpy changes

Standard enthalpy changes: standard

 

conditions

 

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Standard enthalpy change of combustion

ΔH^o_c

 

Bond breaking and bond making

 

 




 


 
 

 

HESS'S LAW

 

FIRE WORKS

THE CHEMISTRY OF GUN POWDER

HAND-WARMERS

  ENDOTHERMIC AND EXOTHERMIC REACTIONS

http://www.bbc.co.uk/schools/gcsebitesize/science/add_aqa_pre_2011/chemreac/energychangesrev1.shtml
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http://antoine.frostburg.edu/chem/senese/101/thermo/faq/exothermic-endothermic-examples.shtml
HESS'S LAW

http://chemwiki.ucdavis.edu/Physical_Chemistry/Thermodynamics/Thermodynamic_Cycles/Hess%27s_Law
http://www.chemguide.co.uk/physical/energetics/sums.html
http://www.bbc.co.uk/bitesize/higher/chemistry/calculations_3/hess/revision/1/