The person will feel cold.
Exothermic processes involve the loss of heat from the system, whereas endothermic processes bring heat into the system. Since heat is being lost from the system and heating up the test tube, reaction A is exothermic. The primary distinction between exothermic and endothermic reactions is that the former releases energy into the environment while the latter collects energy in the form of heat from its surroundings. Heat and light are significant indicators that a reaction has occurred when two chemicals are together. The reaction is exothermic if heat is released. Exothermic refers to a reaction in which molecules have transitioned from a higher to a lower energy state.
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