An unknown substance has the following properties: • A uniform appearance
• Physically separates by boiling
• Is a liquid at room temperature
What type of matter is this unknown substance?
-Heterogeneous mixture
-Element
-Homogeneous mixture
-Compound

Homogeneous mixture

Explanation:

Because mixture can be separated by physical methods and homogeneous are uniformly appearances

your parents i think this could be it

metals are good conductor of electricity. it has free electrons on their surface. according to electron pool theory, each atom present in a metal crystal losses all of its valence electron and as a result a pool of free is form. these pool of electrons are free to move and   conduct electricity easily   while making metal as good conductor.

the correct answer is a. the ability of electrons to flow throughout the metal.

if it's not useful, feel free to report for mistake in answer.