Final answer:
The purpose of identifying unknown metals is to determine their properties and characteristics. Flame testing and qualitative analysis are two methods used to identify unknown metals.
Step-by-step explanation:
The purpose of the identities of unknown metals is to determine their properties and characteristics. One common method is flame testing, where different metal ions emit different colored flames when heated in a flame. The emission spectra produced can be used to identify the metal present in the unknown substance. Another method is qualitative analysis, which involves selectively precipitating metal ions from a mixture to determine their identities.