Answer:
Meaning have no idea of what the compound given to her is and has to know about compound’s nature. But before beginning any kind of research over the compound the first thing. She can directly know about the compound by knowing its name is calcium.
Bromide is made out of two elements that is only two elements are involved in the making of this compound that is calcium and bromine. And that the compound formed is very different from its original elements hand it might not have the properties that the elements had before the reaction.