CHEM 5013
REVIEW SHEET
EXAM #3
Chapter Three – Molecules, Moles and Chemical Equations
 (3.3) Aqueous Solutions and Net Ionic Equations
o Define: solution, solute, solvent, solubility, soluble, insoluble
o Understanding of solubility tables – YOU WILL BE GIVEN A
SOLUBILITY TABLE but you must know how to interpret it
o Define and give examples of: Electrolytes, Non-electrolytes, Strong
Electrolytes, Weak Electrolytes, Spectator Ions
o Provide properly balanced Molecular, Total Ionic and Net Ionic
Equations for Metathesis (precipitation reactions) AB+CD  AD + BC
 (3.4) Interpreting Chemical Equations and the Mole
o Define: Mole, Avogadro’s Number
o Determine the molar mass of an element or compound
o Understand that coefficients in a balanced chemical equation represent
the molar ratio of reactants and products
o Calculating the Number of Atoms or Molecules in a Given Mass or the
mass of an atom or molecule of a substance
o Converting Moles to Grams, Converting Grams to Moles
o Converting mass percentages (% compositions) to Empirical Formulas of
a compound and then determining Molecular Formulas
o Molarity (M) = Molar concentration = moles of solute per liter of solution
o Dilutions – M1 V1 = M2 V2 – Use ONLY for dilution problems!
Chapter Four – Stoichiometry
 (4.2) Fundamentals of Stoichiometry
o Understand that coefficients in a balanced chemical equation represent
the molar ratio of reactants and products
o Stoichiometry - Amount of Substances in a Chemical Reaction
 (4.3) Limiting Reactants (Reagents)
o What is a limiting reactant?
o Using stoichiometry (molar masses and molar ratios) to determine the
limiting reactant for a BALANCED chemical equation – like Aspirin Lab
and Quiz #4
Rules for Exam
1. You obviously will need your calculators.
2. You will be provided with a reference sheet identical to the one given to you in
class.
3. No other outside sources or information allowed.
Advice
Study the practice problems on the website and the quizzes – many problems
will be similar to the problems found there.
Study your lecture notes and textbook sections provided above as well as the
labs (Reactions in Aqueous Solutions, Determination of a Chemical
Formula, Solutions, Dilutions and Acidimetry)
Valuable Hint (Reminder!!!):
Chemistry is a subject which builds upon itself. You will need to use
information that you learned for Exams 1 and 2 in order to solve some
problems on Exam 2. Specifically, it is assumed that you know how to provide
correct chemical formulas given the name of a compound and that you can
provide the name of a compound given the chemical formula. It is also assumed
that you will know how to convert from one unit to another (ex. mL to cm3 or mL
to L). Also, know the density formula!!!
Example: You should be able to provide a correct formula for calcium
carbonate (CaCO3) or Sodium Nitrate (NaNO3)