In 1930, Arza Yarnal completed research in collaboration with  and Ángela García de la Puerta on the subject of electrolytic oxidation of chlorides. In addition, she published distinguished works in the journal Helvética Chimica Acta and Transactions of the American Chemical Society. Also with Rius Miró, she published  “Estudio del potencial del electrodo de cloro y sus aplicaciones al análisis”, in the Anales de la Sociedad Española de Física y Química in 1933, and “La oxidación electrolítica” in 1935.
She also authored additional educational publications:
* Física y Química de la vida diaria ("Physics and Chemistry in daily life") (1954 and 1959)
* Los primeros pasos en el laboratorio de Física y Química ("First steps in Physics and Chemistry labs") (1956)
* Química en Acción  ("Chemistry in action") (1959).
In addition, Jenara collaborated with Inés García Escalera, professor of the Institute of Secondary Education of Alcalá de Henares, on two books:
*Lecciones de cosas ("Lessons about things") (1958)
*El mundo del saber (ciencias y letras) ("The world of knowledge (Arts and Sciences)) (1968 and 1970), later re-edited in 1982.
She also translated specialized books about the history of science such as Historia de la Química ("The History of chemistry"), by   and Historia de la Física ("The History of Physics"), by .