Which properties describe covalent compounds? a: hard and brittle. c: able to be dissolved in water. c: unable to conduct electricity. d: high melting and boiling points

If electrons move from one place to another, electricity is conducted. This happens in the delocalized bonds in metals as well as in static electricity discharge and conductivity in plasmas.If ions move from one place to another, their charges move along with them. As a result, if you have a solution with a dissolved ionic compound (or if you have a melted ionic compound, for that matter), these charges are free to move around if you apply a voltage to them.

Mechanical advantage is a measure of the force amplification achieved by using a tool, mechanical device or machine system.