1. Molecular View of Reactions
AP Chemistry

2. Draw the mixture made by mixing the two solutions together
Draw the mixture made by mixing the two solutions together. Make sure your picture shows the correct relative number of ions, along with the correct relative amount of solid formed.
Ag NO31-
K I1- +

3. Draw the mixture made by mixing the two solutions together
Draw the mixture made by mixing the two solutions together. Make sure your picture shows the correct relative number of ions, along with the correct relative amount of solid formed.
Cu SO42-
Na S2- +

4. NH4Br(aq) + Pb(C2H3O2)2(aq) 
A precipitation reaction between a solution containing a cation (red) and a solution containing an anion (green) is depicted below. The spectator ions have been omitted. + 
Which of the following sets of reactants best represents the diagram above? Write out the net ionic equation for this reaction.
KNO3(aq) + CuCl2(aq) 
NaClO4(aq) + CaCl2(aq) 
Li2SO4(aq) + AgNO3(aq) 
NH4Br(aq) + Pb(C2H3O2)2(aq) 

5. Draw the mixture made by mixing the two solutions together
Draw the mixture made by mixing the two solutions together. Make sure your picture shows the correct relative number of ions, along with the correct relative amount of solid formed. +
Al Cl-1
K OH1-

6. Write the total ionic and net ionic equations after the two aqueous solutions below are mixed.
If each sphere represents mol of ion, what mass (in grams) of precipitate forms, assuming 100% yield?
What is the concentration of each ion in solution (spectators) after the reaction?
250.0 mL
Na+
Ca2+
CO32-
Cl1-

7. - - - - - - - iii. i. ii. + + + + + + +
Match each name below with the following microscopic pictures of that compound in aqueous solution. Each solution has the same volume.
Sodium chloride
Barium nitrate
Potassium carbonate - - 2- + 2+ - + - + - + + 2+ - + - + 2- i.
ii.
iii.
Which picture best represents HNO3(aq)?
Why aren’t any of the pictures a good representation of HC2H3O2(aq)?

8. Which solution has the highest molarity?
Five aqueous solutions are represented in the beakers below, and their total volumes are noted.
Which solution has the highest molarity?
Which solutions have the same molarity?
If you mix solutions A and C, does the resulting solution have a higher, a lower, or the same molarity as solution B?
50.0 mL
25.0 mL A B C D E
(D) How much solvent must be evaporated from solution D for it to have the same molarity as solution A?

9. The flask below represents the products of the titration of 25 mL of sulfuric acid and 25 mL of sodium hydroxide.
Write the balanced molecular, total ionic, and net ionic equations for the reaction.
If each orange sphere represents mol of sulfate ion, how many moles of acid and base reacted?
(C) What were the molarities of the acid and base prior to the reaction?
(D) What is the final concentration of sodium ions in solution?

10. 1 2 3 4 5
Which of the steps in the following process involve(s) a physical change and which involve(s) a chemical change?

11. Draw a purple arrow representing the electron transition that represents the absorption of greatest energy. Draw a red arrow representing the electron transition that represents the emission of light with the smallest amount of energy.