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, compounds and chemical reactions.
We will add to the conceptual and descriptive knowledge we learned
about 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.
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
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
Bring a Calculator Everyday
There won't be a day that goes by for
the rest of the unit (and possibly the course) in which we don't use a
calculator. Bring a calculator everyday.
The key to Wednesday's Names and Formulas Quiz is available online. View Quiz Key
We are done with names and formulas. We will be using these skills all
year. Having troubles? Seek help. I'm available all lunch periods.
There are three WebAssigns due on
Tuesday, October 14. There is a reading WebAssign, a Reaction Type
WebAssign, and a longer Reaction Type WebAssign. The longer Reaction
Type WebAssign is optional (it says so ... but you're going to have to
read). If you do this OPTIONAL WebAssign there you will be given a
fifth throwout. If you don't do this WebAssign, then it will be an
automatic throwout. It's your choice.
The End is Near!
2 will end on Thursday, October 18. We will complete coverage of Unit 2
concepts on Friday, October 12. Coverage of Unit 3 begins on Tuesday,
October 16. This provides you with several days to go through the
Unit 2 content, freshen up on names, formulas, reaction types,
precipitation reactions and equation balancing. And finally, it gives
you plenty of time to worry about the Unit 2 test ... so pace yourself.
There are several good ways to review for your Unit Test. These include
going over your Unit 2 Packet, reviewing the textbook readings, going
over Past Due WebAssigns, and doing the optional Unit 2 Review
About the Unit 2 Test
The Unit 2 Test will have approximately 17 Multiple Choice questions covering basic conceptual
comprehension (34 pts). There are 2 questions with 6 parts each that
involve names and formulas (24 pts). There are 8 questions in which you
must read about a reaction description and write a balanced chemical
equation; the best 7 scores will be counted (28 pts). Finally, there
are two questions in which you must write a molecular equation and a
net ionic equation for a precipitation reaction (16 pts). That totals
to 102 pts; we will just make 100 pts a perfect score.
Good To Know News
Every nine weeks, students are allowed to
throw out three WebAssigns. The grade will be entered into the grade
book as is and the corrections will be made at the end of the second unit.
At that time, the three "most damaging" WebAssign grades are excused.
the first quarter, there was a special offer: The "Ions" WebAssign was
optional. It served the effect of being a fourth WebAssign
throw-out. Unlike the other WebAssigns, a 0 on this WebAssign will be
entered into the gradebook as an EX and remain as an EX.
Get to Know the Table
It's perhaps the greatest and most
popular infographic of all time! It's called the Periodic Table and it
falls within the realm of science. No - you don't need to "memorize the
periodic table." But you do need to become familiar with it. And
besides, what educated individual wouldn't want to know a bit about the
greatest infographic of all time!
There's numerous Periodic Tables across the web. Here's one of your
teacher's favorites - the Dynamic Periodic Table. Interact with it and
start of learn. Curious minds need to know ... the periodic table.
The Dynamic Periodic Table
Periodic Table - Terrific Triva
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
More About WebAssigns
There will be two types of WebAssigns:
Reading Guides and Practice Assignments. They are set up quite
differently. Reading Guides will allow one attempt per question; you
will not reeceive feedback until after the due date. They will be
discussed after completion. They are graded very leniently; that is,
your grade on the assignment will be much better than your grade on the
WebAssign; think of them as being abnormally curved. NEVER worry about
what your grade is on a Reading Guide; leave that worry up to me.
Practice Assignments are the second type of WebAssign. You are more
accustomed to this type from Physics. You receive immediate feedback.
You are allowed multiple attempts. And your grade on the WebAssign is
(for the most part) your grade on the assignment.
page changes nearly every day; re-load
or refresh to receive the most recent schedule.
|>> Thursday, October 18 <<
- What did we learn in Unit 2?
- How can molar mass and Avogadro's number be used as conversion factors to relate mass, moles, and number of particles?
Time in Class
|>> Monday, October 22 <<
We will continue our discussion of the use of molar mass and Avogadro's
number to do mole conversion problems. We will discuss the Chapter
8.5-6 Reading Guide. 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.