Exam Breakdown

Exam Structure

• Total questions and points distribution:

  • 1 Matching Definitions Question (10 points)

  • 2 True/False Questions (2 points each)

  • 4 Multiple Choice Questions on Polyatomic Ions (2 points each)

  • 2 Calculation Questions (2 points each)

  • 4 Multiple Choice Questions on Molar Mass (3 points each)

  • 1 Calculation Question on Molar Mass (4 points)

  • 2 Pages of Written Nomenclature (32 points total)

  • Additional calculations including mole to gram, atoms to grams, etc.

Individual Components

Matching Definitions

• 1 Question, 10 Points

  • Focus on matching definitions of core chemistry terms.

True or False Questions

• 2 Questions, 2 Points each (4 Points Total)

  • Questions will focus on determining if provided compounds represent empirical formulas.

    • Example: If given a compound with subscripts, reduce to the simplest formula (e.g., 3:6 reduces to 1:2).

Multiple Choice Questions on Polyatomic Ions

• 4 Questions, 2 Points each (8 Points Total)

  • Identify or name polyatomic ions based on the names or formulas provided.

Counting Atoms Questions

• 2 Questions, 2 Points each (4 Points Total)

  • Calculate the number of specific atoms in compounds.

    • Example: For H₂CO₃, know there are 2 hydrogens.

Molar Mass Calculation

• 4 Multiple Choice Questions, 3 Points each (12 Points Total)

  • Calculate the molar mass of given compounds by using periodic table values.

    • Example: Determining the molar mass of sulfur trioxide (SO₃).

Additional Molar Mass Calculation

• 1 Calculation Question, 4 Points

  • Similar to previous molar mass questions but may involve larger compounds.

Written Portion of the Exam

• Nomenclature

  • 2 Pages, 32 Points Total (16 points each page)

  • Comprehensive nomenclature questions focusing on naming and classifying compounds.

Mole Calculations

• 1 Mole to Gram Calculation, 2 Points

  • Convert moles to grams for a given substance.

Multistep Calculations

• Atoms to Grams and Grams to Atoms, 4 Points each (8 Points Total)

  • Require multiple steps to solve.

Calculated Number of Moles

• 1 Question, 4 Points

  • Calculate the number of moles in a given compound.

Percent Composition

• 1 Question, 4 Points

  • Calculate the percent composition of elements in a compound.

Finding the Empirical Formula

• 1 Question, 8 Points

  • Given percentage composition, calculate the empirical formula.

Total Exam Points

• Online Portion: 58 Points

• Review material from the unit three handout for practice, especially focusing on problems similar to those mentioned above.