Identify the endothermic and exothermic reaction.
a. HCl + NaOH——>NaCl + H²0 + heat
b. 2KCIO³(s)——> 2KCI(s) + 3O²⬆️
c. CaO+H²O ——> Ca(OH)²+ heat
d. CaCO³(s)——> CaO(s) + CO²⬆️
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1. exothermic
2. endothermic
3. exothermic
4. exothermic
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