PLEASE HELP!! what reaction is _C₇H₆O₂ + _O₂ -->_CO₂ + _H₂O

Yes, endothermic means it turns cold. and some chemical changes include change of tempature.

In reversible reaction chemistry equilibrium is attained when the forward and reverse reactions are taking place at the same rate, thus, the concentrations of reactants and products remain the same. a reversible reaction is a chemical reaction where the reactants form products that, in turn, react together to give the reactants back. in irreversible reactions on the other hand, the reactants react to form the products, which cannot revert back into reactants.