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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 quiz at the mid-point of the unit. Ideas are both conceptual and mathematical. Bring your calculator every day as you will be using it quite regularly.

Final Word on the Final Exam

The Final Exam has been completed and copied. Here's what you can expect. There are 50 Mulitple Choice Questions worth 1 point each. There are 11 long answer questions worth 2 points each. Your 10 best long answer questions will be counted. That brings the total possible to 70 points. You will have 90 minutes to complete this exam. "If you want this ... you GOT this!"

Unit 5 Scheduling

Daily schedules and WebAssign schedules for Unit 5 will be updated during Final Exam week. We are a long way from finishing it ... but we are two days into the unit. So the end will come a little quicker than you might expect. So will the middle ... meaning the day of the pop quiz.

I'm Not Your Guidance Counselor, But ...

Cool Kids do ScienceHey Students! I'm not your guidance counselor, but when it comes to recommending a science course for your next two years of school at GBS, I might know a thing or two that your counselor doesn't. For one, I know you're all STEM kids and I know that means that you like science and other technical classes. While many of you undoubtedly have great talent in other academic domains, some of you know that a science-engineering-math career is in your future. Don't be bashful if you wish to overdose on our science and engineering options. Some counselors might warn you against this, arguing that you will become a little unbalanced for doing so and could grow a couple of horns in the middle of your forehead. Those are words of a non-science-minded guidance counselor. The words of your science teacher are this: In 31 years of teaching, I've never seen a science-minded student taking a bunch of science courses that they love begin to grow alien body parts; rather, I've only seen very happy and fulfilled science students who get to do the things they love doing. You don't need anyone's permission to enroll in a lot of science courses. If it's your thing, then go for it!

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.

WebQC Chemical Portal (one of my favorites)

EndMemo (allows formula or name entry)

Environmental Chemistry (scroll to bottom)

Molecular Weight Calculator by Lenntech

or Google, e.g. molar mass Al2(SO4)3

FREE: A Chemistry Study Tip

Stretching out your studies over a lengthy period of time so that there are many "visits" of the material is far better than lengthier, less-frequent sessions of intense studies. So what's this have to do with Chemistry class? I'm going to tell you:

A little Chemistry each day helps. Your homework usually includes two WebAssigns - one is a "looking ahead" WebAssign in which you read about something that is coming up next. The other is a "looking behind" WebAssign in which you practice using something that we just learned in class. So why not do the "Looking behind" WebAssign on the evening of the Blue day - the day you were presented with the material. And then do the "Looking ahead" WebAssign on the evening of the Gold day - the evening just prior to when we cover the material the next morning. Hopefully that makes sense ... and it gives you a little Chemistry every day.  =SIGH=

Keep Up

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 YouTube channel.)

    Online Homework


This page changes nearly every day; re-load or refresh to receive the most recent schedule.

Today in Class

>> Monday, January 13 <<

Focus Question(s):
  • Can you explaini _______ (semester 1 topic)?
  • How can the quantity of heat transferred between systems and surroundings be measured?

  • Any Questions on Semester 1 Chemistry? (up to 45 minutes)
  • Review Heat and Temperature (pp. 1-2)
  • Review Calorimetry and Energy Change; pp. 7-8, Q#1, #2
  • Work on Lab T2 Completion
  • Work on Lab T1 Completion


Next Time in Class

>> Wednesday, January 22 <<

We will discuss bond energy, enthalpy change and chemical reactions (pp. 11-14). We will begin our discussion of thermal stoichiometry. We will will do Lab T5 on the Heat of Combustion.

Periodic Tables

Are you in need of a periodic table?  Try one of the following websites:

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