WEEK 20 AT A GLANCE

 

VIDEO: EQUILIBRIUM CONSTANTS

In this VIDEO, Mr. Hatfield uses the whiteboard to demonstrate how to calculate the equilibrium constants for strong and weak acids, and also how to rearrange the equilibrium setups to solve for the concentration of products or the original acid's concentration.

WEEK 18 AT A GLANCE

 

VIDEO: ACID-BASE EQUILIBRIUM

This VIDEO contains useful demonstration of titration, the subject of our next set of Lab Activities, as well as models how to evaluate an equilibrium setup of a chemical system involving acids and bases.

VIDEO: NOTES ON ACIDS, BASES AND SALTS

This VIDEO contains Mr. Hatfield's notes on the current unit, based on Sections 15.1 and 15.2 of your text.  

Topics include:  water's polarity, hydrogen bonding, the dissociation of water, properties of acids and bases, indicators and titrations, the pH scale, acid-base definitions, salts and buffer solutions.

VIDEO: NORA FLANAGAN

Nora Flanagan is a sophomore English teacher in the Chicago public schools system.  In this 'TED Talk' delivered last summer at Wrigley Field during that phase of the global pandemic, she identifies some ongoing problems with the public schools there were present before the pandemic.   

Much of what Ms. Flanagan describes are also challenges for Fresno public schools, and so her talk is highly-relevant to what we have experienced and continue to experience as teachers, students or parents in the midst of a global pandemic.   

She makes four specific recommendations: "We can and we must engage parents, demand equity, support the whole student and rethink assessment."

 

The full text of Ms. Flanagan's remarks are available on-line, HERE.   As your instructor, I want to encourage all of my students to reflect on her remarks, particularly her comments on how we support the whole student, and whether we consider the student's voice: 

"IF WE ARE HAVING CONVERSATIONS ABOUT ANY OF THIS, AND NOT AUTHENTICALLY INCLUDING AND EMPOWERING STUDENTS EVERY STEP OF THE WAY, WE'RE NOT HAVING CONVERSATIONS ABOUT ANY OF THIS." 

WEEK 17 AT A GLANCE

 

VIDEO: ACID BASE INDICATOR DEMONSTRATION

In this VIDEO, Mr. Hatfield demonstrates the use of 'universal indicator solution' , as a means of comparison with the pH indicator strips used in the "pH of Solutions Lab" performed in class between May 5-12.

Unlike the lab, where we simply estimate pH from color changes, in this demonstration Mr. Hatfield goes back and forth, first adding positive charge (an acid), then negative charge (a base).

This is essentially a series of neutralization reactions swinging back and forth around pH 7 (neutral), and similar in concept to the titrations that will be the subject of our next set of Lab Activities.

WEEK 16 AT A GLANCE