As a solid substance is heated, its volume increases but its mass remains constant. Sketch a graph of density vs. temperature showing the trend you expect. Explain.
(haha I’m lost please help!!)

It would be (at) + cu (s)

  super sorry but i dont know lo

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 -