Change 1. When calciumcarbonate forms calcium oxide and carb

Change 1. When calciumcarbonate forms calcium oxide and carbon dioxide heat is absorbed.Change 2. Calcium oxide releases heat when shaken with carbondioxide.Which line BEST describes these changes?  change 1 isexothermic; change 2 is endothermic change 1 isendothermic; change 2 is endothermic change 1 isexothermic; change 2 is exothermic   4.change 1 is endothermic;change 2 is exothermic

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