Cadmium metal reacts with a solution of copper (II) sulfate to produce pure copper and a solution of cadmium (II) sulfate.

Cd(s) + CuSO4(aq) = Cu(s) + CuSO4(aq)

Explanation:

cadmium metal is a solid, so it will be labeled as Cd(s)

"reacts with a" means it is adding something: so the symbol will be "+"

copper (ll) sulfate is CuSO4, and "solution of" means it is aqueous "aq"

"to produce" means it is creating something, so instead of the "=" it would be an arrow

pure copper is labeled as Cu, and it is a solid

it repeats "solution of cadmium (II) sulfate" so it becomes CuSO4(aq)

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.