How much rope would need to be pulled through a pulley with a mechanical advantage of 2 to lift a load 4 ft?

It won't lose or gain electrons if it's a covalent bond it shares the electrons with another atom or atoms. if it is an ionic bond it will lose the 3 electrons on the outer shell and become a positively charged ion.  credit goes to @sunshinebaby of answers.yahoo.com.

Rain is pulled by gravity which is a non contact force