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Unit 3 - Quantifying Chemical Change

The "story" of Chemistry continues as we delve deeper into the periodic table and the topic of chemical change. In Unit 3, we will discuss the more mathematical topics associated with elements, compounds, and chemical reactions. We will add to the conceptual and descriptive knowledge we learned in Unit 2 by putting numbers to the topic. We will learn about such concepts as average atomic mass, the mole as a counting unit, molar mass, mass-to-mole-to-particle conversions, percent composition, emperical formulas, and the mathematical relationships between the amounts (mass, moles, etc.) of reactants and the amounts of products involved in a chemical reaction.

We will be testing on about the 10th block of the unit. There will be several labs, a small project, and the usual battery of WebAssigns. Bring your calculator every day as you will be using it quite regularly.

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. Even if you do like Winter, avoid the snowball effect in chemistry.

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.)

Bring a Calculator Everyday

There won't be a day that goes by for the rest of the unit (and possible the course) in which we don't use a calculator. Bring a calculator everyday.

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=

Ponderings, Musings, and Other Things

There's always a story in the history of Chemistry. The topic is about more than atoms and molecules, elements and compounds. It is also a story about people and there quest to make sense of and understand the world of chemistry. And if you're interested in a little history about Avogadro's number, check out the following blog post from WIRED magazine.

Even Avogadro Didn't Know Avogadro's Number

Periodic Table - Terrific Triva

Origins of Elements NamesWe will be learning much about the Periodic Table of elements over the next few weeks. One of the most interesting sources of information is the Compound Interest website. It is definitely worth checking out ... and I don't get any $$ for saying so. At this point, you might be interested in finding out where all the names of elements come from? Click the link (or image) and find out:

The Periodic Table - Origin of Elements' Names

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Today in Class

>> Wednesday, October 18 <<

Focus Question(s):
  • How can molar mass and Avogadro's number be used as conversion factors to relate mass, moles, and number of particles?
  • How can one detemine the mass % of the various elements in a compound?

  • Discuss Chapter 8:5-6 Reading Guide (pp. 7-8)
  • Mole Conversions (pp. 11-12, selected problems)
  • Lab QCC1: The Mole Challenge
  • Start Lab QCC2 - Chew On This!
  • Molar Mass and % Composition (pp. 13-14: 1-2 compounds)
  • Finish Lab QCC2 - Chew On This!



Next Time in Class

>> Friday, October 20 <<

We will continue some molar mass and percent composition problems (pp. 13-14). We will discuss the reading on emperical formula determination from mass percent data. BUT the highlight of the lesson will be Lab QCC3. We will roast Mg at high temperatures to synthesize MgO and determine the emperical formula of the product.

Periodic Tables

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

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