Chem 1212 Midterm Exam Questions and Answers| New Update with 100% Correct Answers
Equation for Determining moles of a solid mass (g)/Molar Mass (g/mol)
Equation for Determining moles of a solution Molarity(mol/L) × Volume (L)
Equation for Determining moles of a gas (Pressure (atm) × Volume (L))/(R × Temperature
(K))
Experiment 1 Be able to calculate density from mass and volume data. Determine the
correct layering order based on density, solubility, and miscibility. Calculations: density = mass /
volume
Experiment 2 Identify the reaction type as one of 5 general types for a generic reaction
and/or a chemical reaction. Be able to classify and write a balanced molecular chemical
equation from a written reaction description, including the correct phases and molecular
formulas.
Combination: A + B ---> AB
Decomposition: ABC ---> AB + C
Single Displacement: AC + B ---> A + BC
Double Displacement: AC + BD ---> AD + BC
Oxidation-Reduction: Two half-reactions added together.
Experiment 3 Know the difference between actual (or experimental), theoretical and
percent yield. Be able to calculate theoretical yield and percent yield of Cu(II) saccharinate, or
some other known. A balanced chemical equation will be provided. Be able to mathematically
explain how experimental errors would affect the actual yield and percent yield.
Calculations: moles(solid)= Mass /Molar Mass and Mass = moles x Molar Mass
Convert from moles of A to moles of B using stoichiometric ratio from balanced reaction
Percent yield = (actual yield / theoretical yield) x 100 %
Equation for Determining moles of a solid mass (g)/Molar Mass (g/mol)
Equation for Determining moles of a solution Molarity(mol/L) × Volume (L)
Equation for Determining moles of a gas (Pressure (atm) × Volume (L))/(R × Temperature
(K))
Experiment 1 Be able to calculate density from mass and volume data. Determine the
correct layering order based on density, solubility, and miscibility. Calculations: density = mass /
volume
Experiment 2 Identify the reaction type as one of 5 general types for a generic reaction
and/or a chemical reaction. Be able to classify and write a balanced molecular chemical
equation from a written reaction description, including the correct phases and molecular
formulas.
Combination: A + B ---> AB
Decomposition: ABC ---> AB + C
Single Displacement: AC + B ---> A + BC
Double Displacement: AC + BD ---> AD + BC
Oxidation-Reduction: Two half-reactions added together.
Experiment 3 Know the difference between actual (or experimental), theoretical and
percent yield. Be able to calculate theoretical yield and percent yield of Cu(II) saccharinate, or
some other known. A balanced chemical equation will be provided. Be able to mathematically
explain how experimental errors would affect the actual yield and percent yield.
Calculations: moles(solid)= Mass /Molar Mass and Mass = moles x Molar Mass
Convert from moles of A to moles of B using stoichiometric ratio from balanced reaction
Percent yield = (actual yield / theoretical yield) x 100 %
