Chem 115- SI
1. What are Electrolytes?
Strong Electrolyte
Weak Electrolyte
Non-Electrolyte
2. What are the Strong Acids and Weak Acids?
3. What are the Strong Bases and Weak Bases?
4. Write the molecular, ionic, and net ionic equations for the reaction of aqueous solutions of lead
acetate and sodium iodide, which yields a precipitate of lead iodide and leave the salt sodium acetate
in solution.
5. Predict the reaction that will occur when aqueous solutions of Pb(NO3)2 and Fe2(SO4)3 are mixed.
Write molecular, ionic, and net ionic equations for it.
6. What are the products of an Acid/Base Reaction?
7.
a. In simple (monoatomic) ions, the oxidation state is the _________________________.
b. The oxidation number of any free element ( an element not combined chemically with a
different element) is ________, regardless of how complex its molecules might be.
c. What is the typical charge for H, O, and Halogens?
8. Decide which is oxidation and which is reduction:
Na Na+ + e_
Cl2 + 2e_  2Cl9. What is the difference between “oxidized” and “oxidizing agent”?
10. The bright light produced by the reaction between magnesium and oxygen often is used in
fireworks displays. The product of the reaction is magnesium oxide, MgO, an ionic compound.
2Mg + O2  2MgO
a. ) Which element is oxidized and which is reduced? What are the oxidizing and reducing agents?
b.) What are the oxidation numbers of the atoms in MoS2?
11. Chlorite ion, ClO2-, has been shown to be a potent disinfectant, and solutions of it are sometimes
used to disinfect air conditioning systems in cars. What are the oxidation numbers of chlorine and
oxygen in this ion? Cl = +3 and O = -2
12. Determine the oxidation numbers of the atoms in hydrogen peroxide, H2O2, a common antiseptic
purchased in pharmacies. H = +1 O = -1
13. What is the oxidation number of chromium in the compound Cr(NO3)3? +3
14. Identify the substance oxidized and the substance reduced as well as the oxidizing and reducing
agents in the reaction:
2KCl + MnO2 + 2H2SO4  K2SO4 + MnSO4 + Cl2 + 2H2O
KCl is reducing agent; Cl2 is oxidizing agent -- Cl oxidized and Mn reduced
15. To study the effect of dissolved salt on the rusting of an iron sample, a student prepared a solution
of NaCl by dissolving 1.461 g of NaCl in a 250.0mL volumetric flask. What is the molarity of this
solution?
0.100 M
16. How many mililiters of 0.250 M NaCl solution must be measured to obtain 0.100 mol of NaCl?
400 mL
17. A student needs to prepare 250 mL of 0.100 M Cd(NO3)2 solution. How many grams of cadmium
nitrate are required? 5.91 g