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Unit 8: Kinetics and Equilibrium

Unit 8 of our 9-unit course focuses on the topics of Kinetics and Equilibrium.  We will explore details about reaction rates, considering what variables affect the rates of reactions and why, how reactions take place, and how experimental data can be used to determine equations that describe reaction rates. This is the topic of Kinetics. But we will also explore the topic of Equilibrium. This includes topics like reversible reaction systems in which reactants don't completely  react away and what can be done to persuadethem to more fully react. We will use equilibrium equations to predict the final concentrations and/or pressures of reactants and products. The unit will end with our Maker Fair Project ... which for one-half of our students will involve the creation of an automated titration system.

The unit will include the usual blend of conceptual knowledge with mathematical analysis. There will be approximately 9 days devoted to the unit with the first 2-3 days being focused on the topic of Kinetics.

Unit 7 Tests

The Unit 7 Tests have been graded. You are welcome to view them during lunch hours this week and next. I am also available after school Monday-Thursday. Let me know when you are coming in and I will be in my office.

Collision Model

Our book is a little short on the topic of the Collision Model and Reaction Mechanisms. The following page of terminology with links to informative images may be helpful.

View Collision Model Terminology.

Unit 8 Schedule

Our Unit's schedule is a little tentative right now due to complications with the Maker Fair Project. This week's schedule is rather certain but projections into the following week are not.

What is Meant by "Annotating" in a Lab Report

We tend to do two types of labs - (1) labs that include multiple observations in an effort to identify properties and trends in those properties and (2) labs that include careful measurements and subsequent calculations in an effort to determine an unknown quantitative value. When doing the second of these two types of labs, there are several measurements followed by an extensive set of calculations. The Conclusion section is generally short but the Calculation section is long. The role of the Calculations is to document and present the logic as to how the measurements lead to the quantitative value that the lab proposes to find. A good presentation of measured data and calculations will include annotations. Annotations are short notes that convey what the subsequent calculation involves and the logic behind it. The concept of an annotation was discussed in class on Tuesday, December 6. For those who would like to review the discussion, the notes are provided here.

View Notes on Annotations.

Periodic Table in Pictures and Words

For those who are connoisseurs of periodic tables or simply would like to relish a great moment of geekery, tap the link below and explore on this interactive periodic table of the elements.

Visit Interactive Periodic Table with Words and Pictures.

Mr. H's Little Secret

Pssss.  Hey bud! I have a secret to share. Now that you know how to calculate the molar mass, here's a little cheat you should be permitted to use. It's called a Molar Mass Calculator and you will find several by following the links below. You type in the formula and it calculates the molar mass.

WebQC Chemical Portal (one of my favorites)

EndMemo (allows formula or name entry)

Environmental Chemistry (scroll to bottom)

Molecular Weight Calculator by Lenntech

or Google, e.g. molar mass Al2(SO4)3

    Online Homework


This page changes nearly every day; re-load or refresh to receive the most recent schedule.

Today in Class

Wednesday, April 24

Focus Question(s):
  • How can concentration-time data be used to determine a rate law equation?
  • What variables affect the rate of reaction?
  • What is a reaction mechanism and how can potential mechanisms be evaluate in light of a rate law equation?

  • Seating Charts
  • Method of Initial Rates, pp. 3-6, Q#4-5
  • Introduction to Reaction Mechanisms (pp. 7-9, Q#1, Q#3-5)
  • Lab KE2: Red-Grey Equilibrium Simulation
  • Discuss Equilibrium Concept


Next Time in Class

>> Friday, April 26 <<

We will be focusing on equilibrium, equilibrium expressions, and equilibrium mathematics. It's a BIG day for laying the groundwork for understanidng the remainder of the unit!

Periodic Tables

Are you in need of a periodic table?  Try one of the following websites:

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