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.
Friday's Quiz has been graded and the quiz key is posted online:
View Quiz Key
Hear Ye! Hear Ye! The End is Near!
Unit 5 Test is on Tuesday, February 19. The test will include ~18
multiple choice questions, 6 long-answer problems, and a hands-on lab problem.
There are several good ways to review for your Unit Test. These include
going over your Unit 5 Packet, reviewing the textbook readings, going
over Past Due WebAssigns, and doing the optional Unit 5 Review
WebAssign. As in the past, there will be an optional, no-point
WebAssign Review available that covers topics from the entire unit.
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
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.
|>> Thursday, February 14 <<
- How are entropy change and enthalpy change related to spontaneity of reactions?
- How does one use Gibbs Free Energy to predict whether a reaction is spontaneous or not at a given temperature?
- Review Entropy; p. 20 side margin notes; do p. 23, Q#1-5
- Discuss driving forces (p. 24, Q#7)
- Discuss Spontaneity; p. 25, Q#1-2
- Discuss Gibb's Free Energy equation
- Spontaneity and Free Energy (pp. 27-28)
- Work Time:
- Complete Lab TC8 - Hess's Law
- Work on WebAssign
- WebAssign: Gibbs Free Energy
- Complete Lab Notebook
Time in Class
|>> Tuesday, February 19 <<
will receive your Unit 6 Packet. We will discuss states of matter with
an emphasis on gases and gas pressure. We will take the Unit 5 Test.
Part of this test will include a Lab Practical. You have 15 minutes to
gather data and clean up your station. You are provided general
directions and no data table.