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 series of demonstrations.  Students were tasked with recording observations and then determining whether a chemical or physical change had taken place.

Notes from class:

Next, students watched the following video from Mr. Anderson of Bozeman Science, with the expectation that they can clearly articulate the difference between a chemical and physical change by the end of the video.

After the video, we reviewed the vocabulary of chemical reactions (inputs/reactants and outputs/products) and then students had the remainder of the class period to complete the Lesson 70 Worksheet.


  • Read Lesson 70 in the textbook.  Log in and enter your username and password:
    • Username: full student gmail address.
    • Password: HighlineMM/DD (student birthday, use leading zero if needed, i.e. March 7 = 03/07)
    • Forgot your password?  Click here to reset your password.  Enter your student gmail address and follow the instructions.
  • 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)