Were the reactions in Part C endothermic or exothermic? How did you know that the reactions were endothermic or exothermic? Why was it necessary to use two different concentrations of HCl in the reactions?

Idon’t know what the answer is i wish i could

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 -

1b. convection2f. the same