Identify the spectator ions for the reaction that occurs when aqueous solutions of lithium sulfide and copper(II) nitrate are mixed to form the insoluble copper(II) sulfide. a. Li+ and NO3- b. No spectator ions are present. c. Li+ and Cu2+ S2- and d. Cu2+ Cu2+ and NO3-

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Answerδh > 0explanationc₆h₆  (s)  → c₆h₆ (l)if you are changing it from a solid to a liquid, you are pretty much melting the solid. this requires heat energy. therefore, the reaction is endothermic (takes in energy); the system enthalpy increases as the reaction proceeds: δh > 0.

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