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Can anyone tell me what reaction (endo or exothermic) is adding water to plaster of Paris? Our yr11Chem students did it and teacher asked ME, what kind of reaction it is.
measure the temperature of the water, then add the plaster of paris, stir, measure temp again and you will have your answer. Just be sure to remove the thermometer before it sets! Perhaps it is heat-neutral (if there is such a thing!). I don't know that all chemical reactions have a change in heat.