Thermal energy is flowing from the 1) to the 2). This flow of thermal energy is a system 3).

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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 -

Ican't see the chart but the density of both nickel and cobalt is 8.90 g/cm3, so it would be one of those.

At a given pressure, gas particles with smaller masses move faster.