2H₂ + O₂ → 2H₂O – sparking a hydrogen explosion

ChemistryReactions & RedoxAges 13–14

A mixture of H₂ and O₂ gas in a flask does not react at room temperature. Click Ignite (or tap the flask): the spark supplies energy, effective collisions form H₂O, and the exothermic reaction spreads rapidly into an explosion. A live graph of molecule counts over time, the 2:1 mole ratio, the limiting reactant and conservation of mass are all shown so you can check them against the chemical equation.