Chem 120 Midterm Test #1 Review sheet:
Date/Time/Location: Tuesday October 12 in lab (no lab this week but the Fei labs are
due in)
You must write this test during the designated exam period. No one is permitted to write
late and there will not be a make up test. Anyone missing this test will have its 15% value
added to the weight of their final exam.
Topics: Text and Syllabus Chapters 1-3
Distribution:
1) Approximately 25%:
Element and ion names, universal chemical symbols plus atomic number, atomic weight,
numbers of each type of subatomic particles for each element or ion. (m/c or fill-in-thetable questions). Isotopes, atomic weights, %abundance for elements with multiple
isotopes and exact mass calculations for individual atoms, isotopes and elements.
2) Approximately 30%:
Complete and balance chemical equations for the 5 reaction types emphasizing inorganic
compounds: combustion, precipitation, formation and reaction with water of metal and
not-metal oxides, acid-base, carbonate and bicarbonate formation and decomposition
reactions. Include complete and net ionic equations. Give answers in grams or moles.
3) Approximately 20%:
Combustion calculations for an unknown compound from the gaseous products it
generates. Eg. Write a balanced reaction for the complete combustion of a certain number
of grams of propanol (or some other organic compound) and tell haw many moles and
grams of each product will be produced. Analysis of compounds and mixtures of
compounds by the weights and kinds of gases they generate on thermal decomposition
(halides, oxyacids or salts, carbonates, bicarbonates, hydrates, hydroxides). Write a
balanced reaction for the thermal decomposition of a certain number of grams of sodium
bicarbonate (or some other compound containing potential gaseous components) and
calculate how many grams of product gases there will be.
4) Approximately 25%:
Stoichiometry from reactions (including solution stoichiometry and dilution). E.g. How
many mL of 0.5 M iron sulfate solution can be prepared by reacting 0.1 g of Fe metal
with an excess of sulfuric acid? Limiting reagents, calculations of exact amounts of
reactants and products, amount of excess reagents left over, % yield relative to
theoretical. Eg. If 0.6000 g of Cu is reacted with 1.500 g of S to form Cu2S, which is the
limiting reagent? If only 0.7124 g are produced, what is the % yield for this reaction?
You may bring a single 8.5” X 11” double sided page of notes, formulas,
common ions, compound names, tables of strong versus weak acids and bases.
You will need a scientific calculator to do the calculations with precision
required. You may bring extra scratch paper. (no funny glasses or invisible ink).
Question types will include: fill in the table for isotopes: ( ions, atomic numbers,
electrons, neutrons, atomic mass, element names); short numerical answers,
labeled drawings for theory or apparatus, multiple choice.
I will provide a periodic table and sheet of relevant formulae.