Chemical reactions occur when molecules or atoms collide so that the bonds between atoms break and new bonds form. breaking the
bonds of the reactants requires energy; whereas, bond formation releases energy. select the statements regarding energy changes during a reaction that are true.
If two substances react and the temperature of the mixture decreases, the reaction is endothermic<span>. If two substances react and the temperature of the mixture increases, the reaction is </span>exothermic<span>. A chemical reaction involves the </span>breaking<span> of bonds in the reactants and the forming of bonds in the products.</span>