In a chemical reaction, the reactants are substances that undergo the reaction, and the products are substances that are formed during the reaction. The table below shows the reactants and products of several different chemical reactions. Reactants Products Type of Reaction 4K + O2 2K2O + heat Exothermic 2H2O + heat 2H2 + O2 Endothermic 2CO + O2 2CO2 + heat Exothermic CaCO3 + heat CaO + CO2 Endothermic Based on the information given in the above table, the best definition of an endothermic reaction would be
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