Counting by Weighing

Our work today involved a Counting By Weighing activity.  Students recorded the mass of a small number of objects to then estimate the mass of a much larger number of objects.  The activity was designed to help students begin to make sense of the mole, a unit of chemistry that represents 6.02 x 10^23 of any given object.  In chemistry, we use the mole as a way to measure the number of atoms or molecules.  Students also received a copy of the Chapter 13/14 Study Guide as a tool to begin preparing for the quiz next Tuesday.

Notes from the whiteboard:



  • Read Lesson 75 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 75.
  • Please ask questions about anything from Lesson 75 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)