While se quema la arepa could also be expressed with the phrase "the arepa burns," the important thing is that, with the reflexive form, the process is happening by or to itself rather than with a subject performing the action on some object.
While se quema la arepa could also be expressed with the phrase "the arepa burns," the important thing is that, with the reflexive form, the process is happening by or to itself rather than with a subject performing the action on some object.