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Elephant's toothpaste is a foamy substance caused by the quick decomposition of hydrogen peroxide (H 2 O 2) using potassium iodide (KI) or yeast and warm water as a catalyst. [1] How rapidly the reaction proceeds will depend on the concentration of hydrogen peroxide.
The equilibrium vapor pressure of the catalyst over the liquid alloy must be small so that the droplet does not vaporize, shrink in volume (and therefore radius), and decrease the radius of the growing wire until, ultimately, growth is terminated. The catalyst must be inert (non-reacting) to the reaction products (during CVD nanowire growth).
An illustrative example is the effect of catalysts to speed the decomposition of hydrogen peroxide into water and oxygen: . 2 H 2 O 2 → 2 H 2 O + O 2. This reaction proceeds because the reaction products are more stable than the starting compound, but this decomposition is so slow that hydrogen peroxide solutions are commercially available.
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The graph for these equations is a sigmoid curve (specifically a logistic function), which is typical for autocatalytic reactions: these chemical reactions proceed slowly at the start (the induction period) because there is little catalyst present, the rate of reaction increases progressively as the reaction proceeds as the amount of catalyst ...
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You don't have to search long to read about many different potential catalysts that can drive Apple's (NAS: AAPL) stock back to new highs. I listed several when I first purchased Apple in my ...
Catamaran Corporation (formerly SXC Health Solutions) is the former name of a company that now operates within UnitedHealth Group's OptumRX division (since July 2015). It sells pharmacy benefit management and medical record keeping services to businesses in the United States [3] and to a broad client portfolio, including health plans and employers. [4]