a) When a mixture of copper (II) oxide and carbon is heated, elemental copper forms and carbon monoxide evolves into the atmosphere.
b) When a concentrated solution of sodium hydroxide is added to an aqueous solution of lead acetate, lead hydroxide forms as a solid dispersed in a solution of sodium acetate
c) When aqueous solutions of cupric chloride and sodium phosphate are mixed, solid cupric phosphate separates from a solution of sodium chloride.
d) When heated in an aqueous solution of ammonium acetate, calcium oxide reacts to form calcium acetate, ammonia, and water
a. 2 CuO + C2 --> 2 Cu + 2 CO
b. 2 NaOH + Pb(C2H3O2)2 --> Pb(OH)2 + 2 Na(C2H3O2)
a) CuO(s) + C(s) => Cu(s) + CO(g)
b) 2 NaOH (conc) + Pb(CH3COO)2(aq) = Pb(OH)2(s) + 2 C2H3NaO2(l)