Video: Identifying Endo- and Exothermic Reactions from Reaction Enthalpies

Consider the chemical reaction equation. H + H ⟶ H − H. Is this reaction endothermic or exothermic?

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Video Transcript

Consider the chemical reaction equation shown. H plus H react to form H single bond H. Is this reaction endothermic or exothermic?

The reaction equation shows that we’re forming a bond between two hydrogen atoms, so this is an example of bond formation. Generally, energy is released to the surroundings when bonds are formed. In an endothermic reaction, energy is absorbed. And in exothermic reaction, energy is released. Therefore, in this reaction, since we are only forming a single bond and we are breaking no bonds at all, this reaction is exothermic.

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