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 persuade
them 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 a return to the topic
of acids and bases at which time we will use our completed and refined
titration system to conduct our student-designed lab investigation ...
just in time for the May 24 Maker Fair.
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
Second Semester Integrated Project
The second semester integrated project
is the creation of an automated titrating system that titrates a sample
of acid using NaOH. You will use an Arduino to control the amount of
volume added to the titrant. You will also control the stirring and
monitor the pH for changes. A sudden and dramatic pH change is a signal
that the endpoint has been reached.
"Science Fair" Project
Each engineering project group will be
responsible for using their engineered titration system to conduct a
student-designed science experiment. This science experiment will be
designed over the next two weeks (4/24 til May 5) and conducted
during the weeks of May 9 to May 19.
As would/should occur in any engineering/science situation, the process will be INCREMENTAL. Do not expect LAST MINUTE SURGES. Last minute surges will not be possible on this project. Put another way, there is no single due date.
Currently, this is the step that each project group must accomplish: By
Thursday, submit two testable questions to the teacher that your group
would be interested in answering using your titration system.
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
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 the Molar Mass
Calculator and you will find it by following the links. You type in the
formula and it calculates the molar mass. (Revised links on 2/28/17)
page changes nearly every day; re-load
or refresh to receive the most recent schedule.
|>> Tuesday, April 25 <<
- 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, Test Comments, Science Fair Project
- Reaction Rates: Concentration vs. Time; rate defintion; rate law equations; method of initial rates; Packet, pp. 4-6, Q#4, 5, 6
- Lab KE1 - Reaction Rates
- Chapter 17.1-2 Reading Guide (pp. 1-2)
- Introduction to Reaction Mechanisms (p. 7, Q#1)
- WebAssign: Reaction Rates
- WebAssign: Chapter 17:3-4 Reading Guide
- ID two Testable Questions
Time in Class
|>> Thursday, April 27 <<
We will continue to discuss reaction rates and reaction mechanisms. We
will make the connection to the topic of equilibrium using Lab KE3. We
will discuss the Reading Guide (pp. 11-12) and the concept of
equilibrium position (p. 13)