Sarah wondered if the nose of a paper airplane was weighted with paperclips, if it would fly further down the hall

Just took the quiz on edgenuity and the correct answer is "c.  4.54 x  10–12  j"

The answer is c - the principal of original lateral continuity. 

Answer is: the equilibrium  shifts toward the reactants, to the left side of chemical reaction.it is because lead(ii) nitrate dissociates in water: pb(no₃)₂ → pb²⁺(aq) + 2no₃⁻(aq).according to lechatelier's principle, the position of equilibrium moves to counteract thechange (more lead cations, common ion), the position of equilibrium will move so that the concentration ofproducts decrease and concentration of reactants of chemical reaction increase.read more on -