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When the reactants are heated, the average kinetic energy of the molecules increases. This means that more molecules are moving faster and hitting each other with more energy. If more molecules hit each other with enough energy to react, then the rate of the reaction increases.
The reaction is spontaneous because its Gibbs free energy is lower after the reaction than before; the entropy at the end of the process is greater than the enthalpy. The reaction takes heat from the water, so it is endothermic. chemical reaction is spontaneous when the difference between the change in its enthalpy and entropy is negative; subtracting entropy from enthalpy yields a quantity called the Gibbs free energy, a measure of work.