Unit 5 - The Thermodynamic Model of Chemical Reactions
There will always be more to the
"story" of Chemisty and in this unit, thermodynamics is the "more" that
we will add to our growing understanding of chemical change. We will
learn that the change in temperature that occurs when a reaction takes
place is associated with the energy required to break bonds and reform
new bonds. We will learn how to measure this energy using a method
known as calorimetry. And we will learn how to use energy and entropy
to predict whether or not a given change will take place. Our ideas
will apply to the very small - to atoms and particles - and apply to
the very large - to the universe as a whole.
We will be testing on about the 9th block of the unit. There will be
several labs, the usual battery of WebAssigns, and a
chemistry-engineering project that will run alongside the execution of
this unit. Ideas are both conceptual and mathematical.
Bring your calculator every day as you will be using it quite regularly.
Semester Exam Grades
The First Semester Final Exam has been
graded and curved. The curve was a generous curve of about 8%. It was
the same curve used last year (for the same test). Grades were a
little lower than last year and a little lower than hoped. The end
result was the following:
As: 9 (includes the two A+'s)
Final Exam Viewing
Some people like to look at their Final
Exam. If you would like to do so, then let me know when you are coming
in - before and after school is preferred, beginning on Wednesday,
January 23 and continuing through the end of following week. After the end
of next week, The First Semester Final and all semester 1 exams will be
the beginning of our unit on Thermodynamics, students will need to
quickly internalize several terms that have deep meaning and are often
misunderstood. These terms include:
System and Surroundings
0th Law of Thermodynamics
A good source of information on this topic can be found in Lesson 1 of
the Thermal Physics chapter of The Physics Classroom. Visit Lesson 1
There will be a Pop Quiz on Wednesday, February 6. You can learn more about any pop quiz at the Quiz Room
Don't fall behind in chemistry at this point. The snowball effect will occur.
That is, you will feel like you're running down a snowy hill with a
rolling snowball rolling behind you. The further you go, the bigger the
snowball becomes until finally ... .
Hopefully, you get my drift.
Come in and get some help when you need it. Use the referenced web
pages and YouTube videso as well. (I highly recommend Tyler DeWitt's
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.
page changes nearly every day; re-load
or refresh to receive the most recent schedule.
>> Wednesday, January 23 <<
- What is heat? What is temperature? How are they different? How are they related?
do two adjacent or nearby objects thermally interact with one another
and how are the interactions explained in terms of heat and temperature?
- Discuss Grades, Viewing Tests, Semester 2
- Demonstration: Liquid N2 Ice Cream
- Discuss System/Surroundings designations, Heat, Temperature, Thermal Equilibrium, 0th Law; Mechanism of Heat Transfer
- Lab T1: Zeroing in on Heat - collect data, graph, conclude
- Think Sheet: Heat and Temperature (p. 1)
Time in Class
|>> Friday, January 25 <<
will review concepts of heat, temperature and thermal energy. We will
discuss how the quantity of heat transferred between objects can be
measured and calculated. And we will do Lab T2 on the Specific Heat of