Question

1.) Write a balanced moleular equation, an ionic equation, and a net ionic equation (NOTE THE PHYSICAL STATES OF EACH).

A.) Sulphuric acid (aq) + barium nitrate (aq) ==> ?

B.) Magnesium metal (s) + nitric acid (aq) ==> ?

C.) Lead (II) nitrate (aq) + potassium chromate (aq) ==> ?

2.) Azurite, 2 CuCO3 * Cu(OH)2 is blue and malachite, CuCO3 * Cu(OH)2 is green. Which contains the higher percentage of copper? Each formula represents a single molecule of the substance. The * means they are bonded together as one.

Answer 1

1) Complete equations for,

A) H2SO4(aq) + Ba(NO3)2(aq) ---->

molecular : H2SO4(aq) + Ba(NO3)2(aq) ----> BaSO4(s) + 2HNO3(aq)

ionic : 2H+(aq) + SO4^2-(aq) + Ba2+(aq) + 2NO3-(aq) ----> BaSO4(s) + 2H+(aq) + 2NO3-(aq)

net ionic : SO4^2-(aq) + Ba2+(aq) ----> BaSO4(s)

B) Mg(s) + HNO3(aq) --->

molecular : Mg(s) + 2HNO3(aq) ----> Mg(NO3)2(aq) + H2(g)

ionic : Mg(s) + 2H+(aq) + 2NO3-(aq) ---> Mg2+(aq) + 2NO3-(aq) + H2(g)

net ionic : Mg(s) + 2H+(aq) ---> Mg2+(aq) + H2(g)

C) Pb(NO3)2(aq) + K2CrO4(aq) --->

molecular : Pb(NO3)2(aq) + K2CrO4(aq) ---> PbCrO4(s) + 2KNO3(aq)

ionic : Pb2+(aq) + 2NO3-(aq) + 2K+(aq) + CrO4^2-(aq) ---> PbCrO4(s) + 2K+(aq) + 2NO3-(aq)

net ionic : Pb2+(aq) + CrO4^2-(aq) ---> PbCrO4(s)

2) Azurite conatins (3 molecules of Cu per molecule) higher percentage of copper than malachite (2 molecules of Cu per molecule).