Thermite reaction 

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Enthalpy is all about potential energy and stability. 


Energy was transferred ______ (into or out of) the system (to/from) the surroundings.

Since energy was ______ (absorbed or released), enthalpy (potential energy) ______ (increased or decreased) in the reaction. 

The products are _______ (more or less) stable than the reactants, because they have (more or less) potential energy.

A energy graph shows the changed in energy associated with the reaction.  Sketch and label a graph to show this.


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Fe2O3 (s)  +  2 Al (s)   >   2 Fe (s) + Al2O3 (s)


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