You don't.
Yes, a dichotomous key is used to identify an unknown organism.
To identify an unknown sample by its emission spectrum
They tried to identify the unknown character.
Sodium carbonate can react with acidic components in the unknown substance to form carbon dioxide gas, which may result in fizzing or effervescence. This reaction can help identify the presence of acidic compounds in the unknown substance.
Properties that could be used to identify an unknown material include density, melting point, boiling point, specific heat capacity, electrical conductivity, and magnetism. By comparing these measurements to known values for different materials, scientists can determine the identity of the unknown material.
its use to identify unknown organisms
by looking on the CD
yes
There are ways, as far as I know some mobile phones have applications that record a short segment of a song and matches it with songs in a music library.
Yes, a dichotomous key is a tool used to help identify unknown organisms by presenting a series of paired characteristics for the user to choose from, ultimately leading to the identification of the organism.
Carrying out various tests such as heating or mixing with other chemicals can help to identify unknown materials. Heating can give different smells and different colors.
They aren't unknown- there is gas, liquid and solid