# Mystery Solutions

For today, students worked through the Lesson 83 Worksheet.  We approached Part 1 as a thought experiment and notes from the whiteboard are pictured below.  The Lesson 83 PowerPoint is included for reference.

Homework:

• 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 83.

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)

# Preparing Solutions

The Lesson 82 Worksheet called for students to work in groups to prepare salt solutions and work through the math to calculate the molarity of their assigned solution.  Although we did not review it in class, the Lesson 82 PowerPoint is available for download.

Additionally, students are encouraged to practice observing the relationship between moles, volume, and molarity using the University of Colorado Molarity PhET simulation below:

Homework:

• 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 82.

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)

# Molecular Views

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:

• 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.

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)

# Solution Concentration

For the first lesson of Chapter 15, students were immersed in the vocabulary of solution concentration.  The Lesson 80 PowerPoint includes six important vocabulary words that students recorded in their lab notebooks. Students received the Lesson 80 Worksheet and worked together in groups to complete Part 1.

For Part 2 of the worksheet, students were shown gummy bears (Haribo) that had been placed overnight in either water, 0.1 M sugar, 1.0 M sugar, 2.0 M sugar, or corn syrup  The gummy bears were rinsed and the mass was measured.  The results are pictured below:

The video of the supersaturated salt solution shown in the PowerPoint is also available below:

Notes from class on April 16:

Homework: