Class began with students receiving back their mini-quiz from last week which we reviewed together as a class. Students were reminded that all work from lessons 70-73 (chapter 13) must be turned in no later than tomorrow for credit. After the review, students voted on one of two options:
Continue forward with Lesson 74: Toxicity
Conduct an experiment focused on the combustion reaction
Students elected to learn about the combustion reaction, so we reviewed the combustion of propane and balanced the equation, then carried out an experiment in which a candle (made of paraffin wax, another hydrocarbon) is combusted under a bell jar. We timed how long the candle burned for, and also measured the amount of oxygen and carbon dioxide in the room (before combustion) and under the bell jar (after the candle extinguished.
Next, we wrote the chemical equations for combining hydrogen peroxide and bleach (producing oxygen) and for combining baking soda and vinegar (producing carbon dioxide). We evaluated the effect of combustion in the presence of excess oxygen or carbon dioxide, measuring how long the candle burned as our endpoint. Class notes are provided below.
We will return to our regularly scheduled programming (lesson 74) tomorrow!
In the first lesson of Chapter 14, students were introduced to the concept of LD50 (the dose of a compound that is lethal to 50% of the population). As our entry task, students considered the following:
Which substance do you think is most toxic to you –
Alcohol (ethanol, C2H6O)
Aspirin (salicylic acid, C7H8O3)
Arsenic (III) oxide (As2O3)
Explain your thinking
We then identified the LD50 values for all three substances using the Lethal Doses Handout. We discussed the meaning of LD50 (the lethal dose at which 50% of rats die after exposure to a given amount of a substance, often expressed in mg/kg) and students were shown a Material Safety Data Sheet (MSDS) for water (toxic at >90 mL/kg), providing students with evidence that all substances are toxic at high enough levels. Students then received the Lesson 74 Worksheet to work on during class time.
Notes from class:
Extend Your Learning!
Wondering about how scientists define the kilogram? Turns out the way we define the kilogram just changed late last year. Read about it at PBS.org or watch the video below:
Homework:
Read Lesson 74 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 74.
Please ask questions about anything from Lesson 74 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
For the final lesson of chapter 13, students learned to classify the types of reactions as combination, decomposition, single exchange, or double exchange reactions.
Combination: A + B -> C
Decomposition: A -> B + C
Single Exchange: AB + C -> A + BC
Double Exchange: AB + CD -> AD + CD
We focused primarily slide 8 of the Lesson 73 PowerPoint. Students are encouraged to review the full slide deck, including the vocabulary defined on slides 9-12. Students then received the Lesson 73 Worksheet and Toxic Reaction Cards to work on for the remainder of class. As an alternative, students who self-assessed as needing additional practice balancing equations were offered the opportunity to work through the Balancing Equations Gizmo.
Notes from the whiteboard:
Homework:
Read Lesson 73 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 73.
Please ask questions about anything from Lesson 73 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
Class began with the ChemCatalyst from the Lesson 72 PowerPoint. With the lesson focusing on balancing chemical equations, we worked through the ChemCatalyst equation with a focus on differentiating coefficients and subscripts (slides 11 and 12). We used the remainder of the class period to practice balancing equations.
Notes from the whiteboard:
Extra Practice!
For students who would like additional instruction around balancing equations and enjoy learning by watching videos, I recommend Tyler DeWitt’s videos Introduction to Balancing Equations (above) and Balancing Chemical Equation Practice Problems (below):
Homework:
Read Lesson 72 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 72.
Please ask questions about anything from Lesson 72 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
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!
Homework:
Read Lesson 70 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 70.
Please ask questions about anything from Lesson 70 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
With half of our students taking the SAT on Wednesday and Thursday’s attendance impacted by the light snow we received Wednesday evening, we invested our class time in finishing Hunting the Elements and then students were offered the opportunity to earn 5 bonus points on their Unit 3 Exam. To earn bonus points, students need to complete the model depicted below and write an explanation about what is happening to the drum (focusing on temperature, pressure, and volume in the before, during, and after parts of the experiment). Watch the video below between 1:44 and 3:18 for the experiment. Have fun!
After reviewing and practicing the Ideal Gas Law yesterday, it was time to put theory to action! We worked through the Lesson 65 Worksheet which included a lab designed to demonstrate the ideal gas law. In the lab, students were divided into 8 teams and then worked together to calculate the volume of air in a breath (lung capacity).
Homework:
Read Lesson 65 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 65.
Please ask questions about anything from Lesson 65 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
Friday, February 22: We concluded our learning for the week with Lesson 64 of our textbook: The Mole and Avogadro’s Law. We worked through slides 5-7 of the Lesson 64 PowerPoint and then students received the Lesson 64 Worksheet to work through in small groups. Students were instructed to complete the worksheet as homework over the weekend.
Monday, February 25: Our study of the mole and Avogadro’s number will continue today and tomorrow as students return from ELPA testing. For our lesson today, we began with a review of dimensional analysis by way of also reviewing phase changes. The diagram below illustrates the connection between the three phases of matter commonly encountered on Earth, and the vocabulary associated with changing phase. Click on the image to learn a whole lot more about the science of phase change.
To help students visualize the least familiar of the phase change reactions (the solid-to-gas and gas-to-solid phase changes), we watched a brief video below, complete with spooky soundtrack:
Next, we investigated the concept of number density by learning about the densities of different phases of water. We calculated how much mass would be in a given volume of sample of each phase of water, appreciating the effect of phase on mass. We then asked the question: how can we calculate the mass of a given amount of any particles of a substance? To help answer that, we watched the Crash Course video below:
To end class, we learned how to use the periodic table to calculate mass of one mole of various molecules.
Class Notes:
Class Notes from February 26:
Extend Your Learning!
Interested in how scientists calculated the number of particles in one Mole? Read about it at Wired Magazine.
Homework:
Read Lesson 64 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 64.
Please ask questions about anything from Lesson 64 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
We returned from mid-winter break with a return to our work studying the gas laws. Our exploration included a series of activities designed to guide students through the process of not only deriving the Gas Laws, but ultimately to derive the Ideal Gas Law constant, R. For today’s work, students were tasked with collecting data from all three stations and then completing Part 1 of the packet as a team. We completed Part 2 as a class, ultimately deriving the Combined Gas Law. For homework, students took home a copy of the Lesson 61 Worksheet with the expectation that they will work through the Lesson 61 worksheet and return to school prepared to use the Combined Gas Law. Students should also read through Lesson 61 in the textbook (see below) and work through the exercises at the end of the lesson for practice. For additional help, check out the video below. Reminders about more opportunities for help are provided at the bottom of this post.
Notes from class:
Highly Recommended Video:
Homework:
Read Lesson 61 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 61.
Please ask questions about anything from Lesson 61 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
With Snowpocolypse on the horizon, rather than introduce the Combined Gas Law, students had the class period to complete unfinished assignments, practice the gas laws, or attempt the chemistry challenge. For convenience, here are links to:
Please stay warm and safe this weekend. If you or anyone you know needs help staying warm, please see the flyer below (distributed by Highline Public Schools Central Office).
Science with Swart 
You must be logged in to post a comment.