Review for Exam

1
Review for Exam 2

• Chap 3
• atomic mass, molecular mass, amu
• what is the atomic mass unit based on?
• molar mass
• convert grams to moles and vice versa
• dont get molar and molecular mass confused!
  how does Avagadros number connect molecular mass
  and molar mass?
• know Avagadros number to 4 sig figs
• empirical vs molecular formulas
• understand the experimental basis for finding
  the empirical formula of a compound
• composition, can you derive an empirical
  formula from it?

2

• Chap 3 (cont)
• what extra piece of info do you need to find a
  full chemical formula? how? where do you get this
  information from?
• can you balance a chemical equation if you are
  told what reactants are involved?
• stoichiometry
• relating moles of reactants to moles of products
  in a reaction, etc.
• identifying limiting reagents (vs. excess
  reagents)
• theoretical yield of a reaction vs. actual
  yield, yield.

3

• Chap 4
• electrolytes vs. nonelectrolytes
• know common examples of strong, weak, and non-
  electrolytes.
• what is the difference between being an
  electrolyte and just being soluble? what makes a
  substance an electrolyte?
• solute, solvent, solution (can you identify
  them?)
• whats an aqueous solution, and how do you
  indicate this in a chemical equation?
• what is the hydration process?
• precipitation reactions and solubility rules
• can you identify the precipitate in a reaction
  when given a set of solubility rules?
• whats the proper subscript for a precipitate?
• molecular ? ionic ? net ionic equations

4

• Chap 4 (cont)
• acids and bases
• Arrhenius definition, Bronsted definition
• what are the electrolyte properties of
  acids/bases?
• what is a weak acid/base vs. a strong
  acid/base? (know common examples of each from
  text)
• mono-, di-, triprotic acids (know common
  examples)
• what is the common feature of most acid/base
  reactions (what are the typical products)?
• how do you represent strong acid/bases vs. weak
  acid/bases in an (net) ionic equation?
• redox reactions
• oxidation numbers of atoms (know the 6 rules)
• identifying oxidizing vs. reducing agents (how
  do oxidation s help?)
• writing half-reactions

5

• Chap 4 (cont)
• can you determine whether a redox reaction will
  occur or not based on a given activity series?
• can you identify a given chemical equation as
  representing a precipitation, neutralization, or
  redox reaction?
• can you predict products of a reaction for the
  three types of reaction we have studied?
• concentration of solutions, units of molarity
  molality
• making solutions
• can you calculate the number of grams of solute
  needed to make a solution?
• can you calculate the number of moles of solute
  in a solution of known concentration?
• can you calculate the volume of stock
  concentrate needed to make a solution by
  dilution?

6

• Chap 4 (cont)
• acid/base titrations
• name the equipment used in a titration.
• what is an indicator? what is the equivalence
  point?
• can you determine unknown concentration from
  added volume of known solution?