reaction rates

Moving right along, we are entering the topics of Kinetics and Equilibrium.

Objectives:

1.  Explain how the rate of a chemical reaction is influenced by the temperature, concentration, particle size of the reactants, and catalysts using collision theory.

2. Identify and interpret information provided on a potential energy diagram; explain the effect of a catalyst on reaction mechanisms.

Here is a brief presentation about Collision Theory:

What this video refers to as a "fruitful collision" could also be referred to as an "effective collision" .

This video offers a summary of Chemical Kinetics:

Later in this blog I have a video showing a potential energy diagram -- a catalyst being used will lower the activation energy and can be shown there.

Here is a demonstration of the effect of surface area on the rate of reaction:

I've performed the lycopodium powder demonstration with just a candle  in my classroom.  I've used a micropipette to blow the powder into the candle and get a very large flame.  I just didn't do the demonstration with a can (as shown here).

A lab determining reaction rate at various concentrations or temperatures is typical for an introductory chemistry course.  If your department typically performs the Iodine clock reaction, find out what is done -- that's great if it's already being performed! 

If you are starting from scratch, something a little easier would be various effects on the rate of  reaction of Alka Seltzer tablets, which are available at the local grocery store.

One lab example is:
http://www.claireonline.ca/wp-content/uploads/2012/04/RateofReactionLab.pdf

My only edit is "thing to crush the Alka Seltzer" -- if you have it available, a mortar & pestle would work quite well.

Here is another series of labs using Alka Seltzer,  but also baking soda and vinegar:

http://classic.berksiu.org/fleetwood/tp_files/docs/251/Alkaseltzerlab13-14.pdf

Here is a basic worksheet on introducing kinetics:

http://www.gpb.org/files/pdfs/gpbclassroom/chemistry/reactionRatesWkst.pdf

The energy changes in a reaction are shown in a Potential Energy Diagram.  Here is a 12 minute video about the parts of the Potential Energy Diagram:

Here are a couple of pages with worksheets about Potential Energy Diagrams:

http://teacherweb.com/FL/StonemanDouglasHS/ASampson/Ch-22-Organic-Chemistry-review-for-test.pdf

http://fileserver.net-texts.com/asset.aspx?dl=no&id=8192

This link has 4 pages to work with:

http://www.colgurchemistry.com/Chem12/pdfs/Microsoft%20Word%20-%20Ch%2012%20Worksheet%201-2_doc.pdf

*I'd love to hear from you!  Your feedback would really help me to focus on your needs. You might be having a school vacation soon (spring breaks are around this time) -- take advantage of the time and write me about your classroom experiences!  Simply click on the "Contact" tab on the top right of this page.  

Check out my lab book "Chemistry on a Budget" at amazon.com:
http://www.amazon.com/Chemistry-Budget-Marjorie-R-Heesemann/dp/0578129159/ref=sr_1_1?s=books&ie=UTF8&qid=1389410170&sr=1-1&keywords=chemistry+on+a+budget

Each lab is presented with two possible report formats -- both with the same procedure -- one with 10 questions to be answered as a conclusion, the other with a full laboratory report required.  This was to give the teacher the option of what type of report is desired! 

Have a good week!