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Is it possible to generate 10-minutes of heat using very small amounts of CaO and water? This is an exothermic reaction.

I've done this experiment at home, but it is very short-lived. I'm trying to understand the ratio of reactants I need to generate heat that lasts long (like heat packs.)

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    $\begingroup$ You can make heat release semi-continuous by adding stoichiometric amount of water drop-wise for 10 min. $\endgroup$ – andselisk May 27 at 20:39
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    $\begingroup$ Perhaps a include a slower reaction whose product is CaO? $\endgroup$ – Melanie Shebel May 27 at 20:42
  • $\begingroup$ Use larger particles of CaO. Or, get cement clinker (which is rich in CaO), and grind the 1 inch chunks to whatever size works for you. $\endgroup$ – James Gaidis May 28 at 13:45
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There are funnels with an Archimedic spiral at the bottom -- in principle quite similar to a truck with a concrete mixer. So, provided you are able to grind CaO into a fine powder, slowly turning this screw will add CaO into a receiver flask below. Like this one:

enter image description here

(reference)

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