Pre-lab questions and answers - Chemistry Classes of Professor Alba

Lab Final Exam Review
Fall 2012
Chem 1112
Question Types on the Final Exam
Multiple Choice
Short answer
Solving Problems/Interpreting graphs or
• Glassware, Names and uses:
• Instruments and use: See individual labs
• Techniques: See individual labs
• ALL Pre-lab questions and answers : Publishers
answer key will be posted on ACES- do not copyyou can improve on their answers
• Selected Results and Calculations : see this
• Parts of FORMAL LAB Report and what goes into
each part:
Selected Results and Calculations:
What to study for each lab is detailed on the
following slides but make sure you study the
Powerpoints for each lab posted in the Lab Files
and on our weebly website.
• All (pre and post lab questions and results)
• Names and structure of reactant and product:
common and technical (IUPAC)
• The Chemical Reaction and conditions
• Calculating limiting reactant
• Calculating Theoretical Yield & Percent or %
• Techniques and important precautions:
• A. Suction filtration/ vacuum filtration
• B. Precipitation Recrystallization
• C. Melting point Determination
10A Geometric Isomers
• Pre-lab only
• What is an isomerization? How can you tell
isomers apart?
• Know structures and names
12A Molar Mass from Freezing Point
• All (pre- and post lab, results, graphs and
• Know all related definitions very well (see lab
• Given a freezing point set-up, be able to
analyze errors or poor conditions (see ppt)
• Given a graph, know how to extrapolate, know
how to determine the change in freezing point
from the graph
13 Rate of an Iodine Clock Reaction
• Pre-lab only
• Be able to explain how this experiment uses
the rate law expression
14A Le Chatelier’s Principle
• Pre-lab only
• Be able to use Le Chatelier’s Principle to
predict experimental results for a given
chemical reaction
14B Determining an Equilibrium Constant
• All (prelab, postlab, results graphs, calculationsincluding parts of a formal lab report as discussed
in class
• Be able to write the chemical formulas and the
equilibrium reaction
• What is the theory behind spectrophotomertry?
Possible sources of error?
• What is a standard calibration curve?
• How is a Spectronic 20 Spectrophotometer used?
15 Relative Strengths of Acids and Bases
• Pre-lab only
• Be able to describe how to carry out each type
of analysis using:1. indicator solutions
2. pH paper 3. pH meter
• Which of the methods is most precise and
• What is the proper technique in using pH
• How is a pH meter calibrated? What does a pH
meter measure?
15 Relative Strengths of Acids and Bases
• Given a diagram (or key) Indicator Color Chart
and a set of results, be able to figure out the
possible pH of a solution by narrowing down
the range (see lab ppt)
16A Equilibria with Weak Acids
• Pre-lab only
• What is the effect on pH of:
– dilutions
– mixing acids and bases
– mixing acids
– mixing acids or bases with the salt of the acid or
• CH3COONa = sodium acetate, the sodium salt of acetic
• NH4NO3 = ammonium nitrate, the ammonium salt of
nitric acid, or
the nitrate salt of ammonia
• Na3PO4 = sodium phosphate, the sodium salt of
phosphoric acid
16B A Titration Curve
• All (pre and postlab questions and answers,
Results and calculations and graphs)
• Define all terms
• Given a titration curve be able to explain, its
parts and what is happening in the solution at
stages before, during and after the
equivalence point
• Identify the type of acid-base titration: strongstrong or weak-strong from a diagram
18 Spontaneity
• Pre-lab only
• Study all definitions and how to use the table
for determining spontaneity ( see lab ppt)
• Be able to explain which of the parameters
were measured in this lab and which ones
were calculated in the Gibbs free Energy
Formula( DG =DH – TDS)