Our work today involved thinking about solutions from a molecular perspective. Students briefly reviewed yesterday’s Gummy Bear portion of the lab via the ChemCatalyst on slide 3 of the Lesson 81 PowerPoint. Students then received the Lesson 81 Worksheet and the Particle Views Handout. The handout was used in Part 1 of the worksheet. For Part 2, students assembled into groups and gathered around lab stations to gain experience diluting a 3.0 M stock solution to a 1.5 M solution. They also observed how two different volumes of a solution with the same concentration both appear the same color. The lesson helped illustrate the connection between molarity (M), particle density, and the number of moles (particle number) in a solution.

**Notes from the whiteboard:**

**Practice Problems from class (Lesson 81 Exercises from the textbook):**

**Homework:**

- Read Lesson 81 in the textbook. Login via hs.saplinglearning.com 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 81.
- Please ask questions about anything from Lesson 81 you do not yet fully understand.

**Opportunities For Help Outside of Class:**

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

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