Select the precipitate that forms when aqueous ammonium sulfide reacts with aqueous copper(ii) nitrate. refer to the solubility rules.

The precipitate formed is copper (II) sulfide.

Explanation:

Precipitate is defined as the insoluble salt that is formed when two different solutions are mixed together. It settles down at the bottom of the flask after some time.

The balanced chemical equation for the reaction of ammonium sulfide and copper (II) nitrate follows:

By Stoichiometry of the reaction:

1 mole of aqueous solution of ammonium sulfide reacts with 1 mole of aqueous solution of copper (II) nitrate to produce 1 mole of solid copper (II) sulfide and 2 moles of aqueous solution of ammonium nitrate.

Hence, the precipitate formed is copper (II) sulfide.

answer: enthalpy

explanation:

for a exothermic reaction, the energy is released i.e. the energy of the products is lower than the energy of the reactants.

= enthaply

= energy of products

= energy of reactants

as , thus comes out to be negative. negative value of enthalpy shows that the reaction is exothermic.