The Mole and Avogadro’s Law

Friday, February 22: We concluded our learning for the week with Lesson 64 of our textbook: The Mole and Avogadro’s Law.  We worked through slides 5-7 of the Lesson 64 PowerPoint and then students received the Lesson 64 Worksheet to work through in small groups.  Students were instructed to complete the worksheet as homework over the weekend.

Monday, February 25: Our study of the mole and Avogadro’s number will continue today and tomorrow as students return from ELPA testing.  For our lesson today, we began with a review of dimensional analysis by way of also reviewing phase changes.  The diagram below illustrates the connection between the three phases of matter commonly encountered on Earth, and the vocabulary associated with changing phase.  Click on the image to learn a whole lot more about the science of phase change.

To help students visualize the least familiar of the phase change reactions (the solid-to-gas and gas-to-solid phase changes), we watched a brief video below, complete with spooky soundtrack:

Next, we investigated the concept of number density by learning about the densities of different phases of water.  We calculated how much mass would be in a given volume of sample of each phase of water, appreciating the effect of phase on mass.  We then asked the question: how can we calculate the mass of a given amount of any particles of a substance?  To help answer that, we watched the Crash Course video below:

To end class, we learned how to use the periodic table to calculate mass of one mole of various molecules.

Class Notes:


Class Notes from February 26:


Extend Your Learning!

Interested in how scientists calculated the number of particles in one Mole?  Read about it at Wired Magazine.


  • Read Lesson 64 in the textbook.  Login via and enter your username and password:
    • Username: wahps****s-####### (**** = first 4 letters of your last name and ####### = student number).  Remember to include the dash between s and #.
    • Password: S-####### (the S must be capitalized)
  • Work through the practice problems at the end of Lesson 64.
  • Please ask questions about anything from Lesson 64 you do not yet fully understand.

Opportunities For Help Outside of Class:

  1. Mr. Swart’s office hours: Mondays, Tuesdays, and Thursdays after school until at least 3:00 (later with advanced notice)
  2. Use the vast number of resources available on this website – check each lesson!
  3. Email Mr. Swart for help if staying after school is not possible
  4. Form a study group with other students  to review concepts from class
  5. Attend MASH after school (M/T/Th in Library)
  6. Attend Math Lab after school (T/Th in Room 124)

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