Ca + 21120 — Ca(OH)2 + H2
How many moles of H20 are needed
to react with 2 moles of Ca?

Exothermic,  physical change after it is already baked

Aphysical change is one that you can put in and remove like a ham sandwich. the stuff you put in there can be changem its not permanet. a chemical change is on that can't be change thats permanet. like when you make a cake and bake it. you can't get those ingredients back.

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