Neutralization Reactions

For our final lab of the school year, students worked together to calculate the amount of carbon dioxide exhaled in a given period of time.  The lab brings together our study of color and pH (purple cabbage juice indicator) and our study of global warming and climate change from the end of our previous unit.  Students will balance equations, calculate moles of carbon dioxide produced per minute, and calculate how many pounds of carbon dioxide the average person exhales each day.  Students will complete the Lesson 88 Handout, which includes instructions for writing a lab report.

For the second day of this lesson, we began with a video describing the effect of ocean acidification on oyster larvae in the Pacific Northwest:

The video presents a dire vision of our future if ocean acidification is ignored. As scientists, we know there is always a solution out there, and to that end we watched the second part of this video series titled Solutions.

The remainder of class was used to work through the Lesson 88 handout.  Notes from class are pictured below:

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Note: There are numerous sources of potential error in our experiment.  When interpreting results, it is important to also consider whether other scientists have conducted similar experiments or have conducted experiments designed to discover the same endpoint (how much carbon dioxide a person exhales in one day).  For example, using a different experimental approach, globe.gov estimates the average human actually exhales 0.9 kg (about 2 pounds) of carbon dioxide per day!

Whiteboard notes from June 14:

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Keep Learning!

Homework:

  • Read Lesson 88 in the textbook and complete the exercises assigned in the work packet.  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)
  • Please ask questions about anything from Lesson 88 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)

 

Dilution

To close out the week, we embarked on a study of dilution, a technique used by scientists to alter the concentration of a liquid.  For our lesson, students worked with their lab groups to prepare serial dilutions of a solution colored with one or more food dyes.  They measured the peak absorbance of their assigned colors at each dilution and then graphed their results, followed by analysis of the graph as outlined in the Lesson 87 section of the work packet for Lessons 85-87.

With so many activities last week keeping students out of class, only a few people were able to complete the Dilution Lab.  We will complete the lab on Monday, with students watching a brief video explaining how a spectrophotometer works, and then they will receive a set of teacher-generated absorbance data for the diluted color samples.  The data is contained in the Dilution Lab Slide Deck. Students will complete the Lesson 87 questions and then turn the packet in for credit.

Notes from class (June 12 Review):

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Tomorrow we will engage in our final lab of the year!

Homework:

  • Read Lesson 87 in the textbook and complete the exercises assigned in the work packet.  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)
  • Please ask questions about anything from Lesson 87 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)

[H+] and pH

We elected to take our time working through Lesson 86, starting off by learning about the strongest acids and bases in the world:

Next, we worked through a set of class notes and practice problems pictured below (the Lesson 86 PowerPoint is available for reference), connecting molar concentration of H+ or OH- with pH.

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After the notes, students transitioned to the Lesson 86 section of the Lessons 85-87 packet.

The next day, we began class by practicing the skill of calculating pH from molarity and molarity from pH.  Students were reminded that Google Chrome can be used as a calculator.  Desmos.com offers a nice web-based scientific calculator as well.  Students had the remainder of class to work through the Lesson 86 section of the Lessons 85-87 packet.

Some additional videos that might be helpful:

Students requiring further practice with the math in this lesson should watch the Crash Course video below:

Dude!

Homework:

  • Read Lesson 86 in the textbook and complete the exercises assigned in the work packet.  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)
  • Please ask questions about anything from Lesson 86 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)

 

Acid and Base Theories

We extended our learning about acids and bases by learning and applying the Arrhenius and Bronsted-Lowry definitions via the Lesson 85 PowerPoint, the Lesson 85 worksheet, and the Acid-Base Solution Card sort activity.  For homework, students were assigned textbook problems #1-8 from Lesson 85, provided to students in the form of a work packet for Lessons 85-87.

Note: While our intent is to complete the packet this week, we have the following scheduled interruptions and will adjust our timeline and learning goals accordingly:

  • WCAS Science Exam (all 11th grade students) on Tuesday, June 4 and Wednesday, June 5.  Students will test either during periods 1-3 or 4-6, with a schedule forthcoming.
  • All 10th grade field trip on Wednesday, June 5.
  • Pirate Mutiny on Friday, June 7, schedule forthcoming.

Keep Learning!

Interested in learning more about acids and base chemistry?  Check out the Crash Course video below:

Students who would like to further their understanding of Bronsted-Lowry acids and bases are encouraged to watch the Khan Academy video provided below:

Homework:

  • Read Lesson 85 in the textbook and complete the exercises assigned in the work packet.  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)
  • Please ask questions about anything from Lesson 85 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)