Sunday, April 15, 2018

VIDEO: OXIDATION REDUCTION REACTIONS

Tyler DeWitt has made a very handy, easy-to-understand video that uses the formation of an ionic compound (NaCl, sodium chloride) to illustrate the logic of oxidation-reduction reactions, sometimes called 'redox' reactions, as described in Chapter 20.

Tyler not only gives an example of oxidation numbers (20.2), but he also shows how to to use these numbers to describe 'half-reactions' (20.3)

While there is no worksheet based upon this video, this is highly-similar to how students will be introduced to these concepts in Lecture, and is worth repeated viewings:






Wednesday, April 4, 2018

VIDEO: ACID-BASE EQUILIBRIUM

Students were shown this video in today's class.   Paul Andersen demonstrates the centrality of water to most acid-base chemistry, and explains how to calculate equilibrium constants for acids (Ka) and bases (Kb), and how to express those as pKa's or pKb's:


SYLLABUS, UNIT 7

Students, here is the Syllabus for Unit 7, which focuses on acids, bases, salts, titrations and electochemistry.  Please note that there are three sections of the textbook to review, and three labs in this Unit.  On the day you receive this Syllabus in class, there will 45 days of instruction left in the semester:


Friday, March 16, 2018

NOTES: CHEMICAL KINETICS



Students, here are the Power Point Notes on Chemical Kinetics, which covers the concept of equilibrium and the rates of reaction.


The Study Guide will be made available in class on Monday, March 19th.  If you need to get another copy, you can download a PDF version of the Study Guide HERE.

YOUR UNIT 6 TEST ON THERMOCHEMISTRY AND KINETICS is on Wednesday, March 21st.   As always, extra time is available at LUNCH or AFTER-SCHOOL.



Thursday, March 1, 2018

POWER POINT NOTES: THERMOCHEMISTRY

Students:

Here are the Power Point Notes for Unit 6:  Thermochemistry.  




In this you will find discussions of phase changes (again!),  heat transfer, the 1st and 2nd Laws of Thermodynamics, and problems to calculate energy (q) , specific heats and enthalpies of reaction:

Click here to download those notes.

Friday, February 23, 2018

VIDEO: ENTHALPY OF REACTIONS

The following video by Paul Anderson was introduced in class on Thursday, Feb. 23rd.   It helpfully reviews some of the information already given in lecture regarding heat and the enthalpy of reactions. It also features a very handy, step-by-step demonstration of how to apply Hess's Law (a SUBTLE and advanced topic) to calculate enthalpies.




Students have an assignment based on that video, which is available HERE as a PDF file.

Wednesday, February 21, 2018

SYLLABUS, UNIT 6: THERMOCHEMISTRY and KINETICS

Students, here is the new Syllabus for Unit 6, which began on the 13th.  Note that it includes a handful of items from the previous unit,and has not one, but two Study Guides reflecting two different sections of notes: