54 . Which type of reaction involves the greatest amount of energy per mole of reactant?
(A) Precipitation reactions
(B) Acid/base reactions
(C) Redox reactions
(D) Combustion reactions
(E) Nuclear reactions55 . Hydrochloric acid, HCl (aq), is a very common laboratory reagent for many purposes: as an
acid, an oxidizing agent, and a source of Cl− ions. Which of the following reagents will react
with 0.20 M HCl to give a precipitate? Assume equal volumes of solutions.
(A) 0.20 M lead nitrate, Pb(NO 3 ) 2
(B) 0.10 M barium hydroxide, Ba(OH) 2
(C) 0.20 M sodium acetate, NaCH 3 COO
(D) Silver metal, Ag (s)
(E) Bromine-water, Br 2 (aq)56 . How many moles of potassium ions are present in 2.50 L of 0.200 M potassium sulfate?
(A) 0.0800 mol
(B) 0.160 mol
(C) 0.400 mol
(D) 0.500 mol
(E) 1.00 mol57 . ....Na 3 PO 4 (aq) + ....Mg(NO 3 ) 2 (aq) →
....Mg 3 (PO 4 ) 2 (s) + ....NaNO 3 (aq)Equal volumes of 0.10 M sodium phosphate and 0.10 M magnesium nitrate are mixed
according to the unbalanced reaction equation above. Which of the following statements