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ELEPHANT TOOTHPASTE
SCIENTIFIC PRINCIPLE The overall equation for this reaction is: 2 H2O2(aq) → 2 H2O(l) + O2(g) However, the decomposition of the hydrogen peroxide into water and oxygen is catalzyed by the iodide ion. H2O2(aq) + I-(aq) → OI-(aq) + H2O(l) H2O2(aq) + OI-(aq) → I-(aq) + H2O(l) + O2(g) The dishwashing detergent captures the oxygen as bubbles. Food coloring can color the foam. The heat from this exothermic reaction is such that the foam may steam.
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