CHEM 1212 Midterm Exam Questions and Answers Already Passed Latest Update 2025-2026
Equation for Determining moles of a solid - Answers mass (g)/Molar Mass (g/mol)
Equation for Determining moles of a solution - Answers Molarity(mol/L) × Volume (L)
Equation for Determining moles of a gas - Answers (Pressure (atm) × Volume (L))/(R ×
Temperature (K))
Experiment 1 - Answers 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 - Answers 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 - Answers 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 %
Experiment 4 - Answers Be able to determine which reactant is the limiting reagent (by
calculations and/or observation) and explain why. Be able to calculate the theoretical and
percent yield of the product, [Ni(en)3 ]Cl2 . Be able to mathematically explain how experimental
errors would affect the end results.
Calculations: Same as Exp. 3 and molessolution= Molarity x Liters; Molarity = moles/Liters
Experiment 5 - Answers Be able to calculate the mass of citric acid in fruit juice from a known
amount of standard NaOH solution. Be able to mathematically explain how experimental errors
Equation for Determining moles of a solid - Answers mass (g)/Molar Mass (g/mol)
Equation for Determining moles of a solution - Answers Molarity(mol/L) × Volume (L)
Equation for Determining moles of a gas - Answers (Pressure (atm) × Volume (L))/(R ×
Temperature (K))
Experiment 1 - Answers 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 - Answers 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 - Answers 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 %
Experiment 4 - Answers Be able to determine which reactant is the limiting reagent (by
calculations and/or observation) and explain why. Be able to calculate the theoretical and
percent yield of the product, [Ni(en)3 ]Cl2 . Be able to mathematically explain how experimental
errors would affect the end results.
Calculations: Same as Exp. 3 and molessolution= Molarity x Liters; Molarity = moles/Liters
Experiment 5 - Answers Be able to calculate the mass of citric acid in fruit juice from a known
amount of standard NaOH solution. Be able to mathematically explain how experimental errors
