Why did a stream of bubbles move away from the stainless steel screw in the salt solution but not the sugar solution?

Answer and Explanation:

The steam of bubbles moves away from the stainless steel screw in the salt solution because in salt solution the molecules of the salts break down in ion form and produce electricity.

The electricity produced by the salt ion is responsible for the movement of bubbles

On the other hand in the solution of sugar no ions are produced and hence no electricity is generated and hence no movement of bubbles.  

yes it is balanced

the number of valence electrons for each molecule or ion is shown beneath the structure. remember hydrogen will not have more than two electrons. this hydrogen is part of a covalent bond (sharing two electrons). a double bond here would cause hydrogen to share four electrons with phosphorus.