classify each substance as either a conductor or insulator. a sample of mercury: a piece of glass: a rubber…

Brief Explanations:

Mercury is a metal and conducts electricity well, so it's a conductor. Glass is a non - metallic solid that does not allow the flow of electric current easily, making it an insulator. Rubber is also an insulator as it does not conduct electricity. A negatively ionized lithium paste has mobile ions which can carry electric charge, so it is a conductor.

Answer:

A sample of mercury: Conductor A piece of glass: Insulator A rubber hose: Insulator A negatively ionized lithium paste: Conductor