Week 23:  22 February to 26 February 2021

22 February 2021:

In Class:  Empirical and Molecular Formulas (Chapter 5:3 to 5:6) and Percent Composition (Chapter 5:19 to 5:20).

  •  % composition by mass = 
  • mass of part
     mass of whole 
  •  × 100
  • Expectations:  Students will be able to calculate molecular formulas.

    Expectations:  Students will be able to calculate the percent composition in a chemical formula.

    Homework:  Finish the Empirical and Molecular Formula Worksheet.
    Here is the Empirical and Molecular Formula Answer Key to help you.

    23 February 2021:

    Lab 18b:
    Analysis of the Precision in Gravimetric Measurement Lab from an Excel spreadsheet.

    Expectations:  Students will be able to analyze data in an Excel file.

    In Class:  Calculating mass from moles and moles from mass.  (Chapter 5:20 to 5:21)

  •  number of moles = 
  •  given mass
     gram-formula mass 
  • Expectations:  Students will be able to calculate mass mole problems.

    Due:  The Empirical and Molecular Formula Worksheet.

    Homework:  Finish the Percent Composition Worksheet.
    Here is the Percent Composition Answer Key to help you.

    24 February 2021:

    In Class:  Finish balancing chemical equations.  (Chapter 5:4 to 5:6)

    Expectations:  Students will be able to add coefficients to balance formula equations.

    Due:  The Percent Composition Worksheet.

    Homework:  Finish the Moles and Mass Worksheet.
    Here is the Moles and Mass Answer Key to help you.

    25 and 26 February 2021:

    Lab 20a:
    Use the double block to complete data collection for the Composition of a Hydrate Lab.

    Expectations:  Students will be able to use mole ratios to calculate molecular formulas.

    Due:  The Moles and Mass Worksheet.

    Homework:  Begin the Balancing Equations Worksheet.
    Here is the Balancing Equations Answer Key to help you.

    Note:  3rd quarter ends 8 April 2022.