Warm-Up
A 206-gram bar of iron has sunlight shining on it. Initially, its temperature is 24.7°C. As it gains 1,070.79 joules of energy, its
temperature rises to 36.2°C. Calculate the specific heat capacity of the iron bar using the formula Q = mCAT.

Yes it would be a physical change.

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 -