Physical versus Chemical Change

For our introductory lesson of Unit 4, we revisited the concepts of physical and chemical change in the context of chemical reactions.  The lesson began with a demonstration in which students were presented with a chemical equation, observed the chemical reaction, and then were challenged to prove whether the predicted product could be observed.  The demonstration led to a discussion of physical and chemical change via the Lesson 70 PowerPoint which includes an image of the following reaction: Cobalt (II) chloride (a solid with a rich blue color) + water (clear liquid) reacts to form a pink liquid.  Students had the remainder of the class period to complete the Lesson 70 Worksheet.  Class notes are shown below:


Extend Your Learning!


  • Read Lesson 70 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 70.
  • Please ask questions about anything from Lesson 70 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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