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Unit 4: Atomic and Molecular Models

Our last unit of the First Semester pertains to Models for understanding atoms and molecules. The unit begins with an exploration of quantum models of the atom and their value in explaining chemical and physical properties. The second half of the unit will look at the topic of bonding and make an effort to explain why ionic and molecular compounds form with their specific ratio of atoms.


Update: What About Those WebAssign Throwouts?

Your lowest four WebAssigns for the first nine weeks (Units 3 and 4) have been thrown out. As you may have noticed, your grade may have improved by 1-3 percent.


Earn a WebAssign Throwout

You will be able to throw out three of your most damaging WebAssigns for Units 3 and 4. If you would like to earn a 4th throwout, then do the Stoichiometry 5 WebAssign (due 11/15). It is an optional WebAssign and will automatically be thrown out if you do not do it. But if you do it, then you can earn the 4th WebAssig throwout. Great deal ... if you need it.



Lab AMM1 - Elemental Fingerprinting

Our first lab experience is Lab AMM1 - Elemental Fingerprinting. We will observe the line spectrum of four elemets and match the observed spectra to a database of known spectra in order to identify the element. You will find the database of known spectra here:



One Cool Infographic

Here is my all-time favorite Infographics (even better than the PT):


Learn about its history here. And here's some other very good (but not as geeky cool):



Some Informative Videos

A list of informative videos (some of which will be shown in class) will be kept here. More can be found on a separate page here.



Worthy Quotes

"I don't like it, and I'm sorry I ever had anything to do with it." - Erwin Schrodinger, commenting on the Probablity Functions of Quantum Mechanics

"The smallest units of matter are not physical objects in the ordinary sense; they are forms, ideas which can be expressed unambiguously only in mathematical language." - Werner Heisenberg

"The truth is, everyone is confused by quantum physics." - David Walton, quantum physicist

"Protons give an atom its identity, electrons its personality." - Bill Bryson, author of A Short History of Nearly Everything

"We have to remember that what we observe is not nature herself, but nature exposed to our method of questioning." - Werner Heisenberg

"It was about three o’clock at night when the final result of the calculation [which gave birth to quantum mechanics] lay before me ... At first I was deeply shaken ... I was so excited that I could not think of sleep. So I left the house ... and awaited the sunrise on top of a rock." - Werner Heisenberg

"There are things that are so serious that you can only joke about them." - Werner Heisenberg

"God doesn't play dice with the universe!" - Albert Einstein

"Einstein, stop telling God what to do!" - Neils Bohr

"If quantum mechanics hasn't profoundly shocked you, you haven't understood it yet." - Neils Bohr



Unit 3 Labs ... due Friday, November 15

Did class time go too fast and you missed the details of that lab write-up? Need to know what to put in the Data section or Conclusion section of the lab? Can't see the board? None of the "Yes"s  to these questions need to get in your way. Visit the Laboratory and get the low-down on every lab. We will be doing the following Unit 3 labs:

Lab QCC1: The H2O Challenge

Lab QCC2: Chew On This!

Lab QCC3: Formula of a Hydrate

Lab QCC4: Copper and Silver Nitrate Lab

and additionally Crash of Avogadro Airlines Flight 1023 (on Google Classroom)



The End is Near

Unit 3 Test is Coming.Don't be too alarmed, but just so you know ... the end of the unit is approaching. The AP Stoichiometry Test (aka, Unit 3 Stoichiometry Test) will be taken on Friday, November 15.

The test will include 15 Multiple Choice (mostly conceptual) Questions, six problems (some multi-part), and a lengthy Lab Analysis section in which lab data is given and you must analyze it to answer three questions. The problems include: an Avogadro # conversion, a "simple" stoichiometry problem, a lengthy conversion factor problem, a limiting/excess reactant problem, and a stoichiometry/percent yield problem.  You will be provided a periodic table and a polyatomic ion sheet. You will not be allowed to use a TI NSpire calculator on the test. You can bring your own non-NSpired calculator or use a classroom calculator.

Test preparation can include: review of a well-kept packet, review of past WebAssigns, doing the optional WebAssign review, review of textbook readings, and review of Labs QCC3 and QCC4. Whatever you do to review will help.



Crash of Avogadro Airlines Flight 1023

Google Classroom screenshotToday we will start a short project titled Crash of Avodadro Airlines Flight 1023. To complete the project, you will need to access a Google Sheet and a Google doc. Each has been placed in Google Classroom. You will open the shared Google Sheet and manipulate it in order to complete the project. Everything you need is either in Google Classroom or on pp. 19-20 of your packet. Plan on using classtime for the completion of most of the project. If you complete the project early outisde of class, you will be forced to tutor students during the project.




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.



Unit 3 Quiz Key

The Unit 3 Quiz is graded. As a group, you guys are awesome. Thank your parents for your jeans. Thank them for your genes while you're at it. You can keep your quiz and take a peek at the Quiz Key here.  <== Click





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.)


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



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

WebAssign


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

Today in Class

>> Friday, November 15 <<

Focus Question(s):
  • What did we learn this past unit?
  • How can we use the line spectra of an element to identiy the element?
  • What is the basis of the modern model of the atom - quantum mechanics?

Activities:
  • Collect Lab Notebooks
  • Chapter 11:1-5 Reading Guide (pp. 1-2) with Flame Tests
  • Bohr's Quantum Model of the Atom: Video; Packet, p. 4; Confetti Demo; review p. 2 of Packet (esp. Q#9-12)
  • Discuss Wave-Particle Duality (TedED video); Image; Plank's Equation; line spectra; Packet, p. 3, Q#4-5
  • Heisenberg Uncertainty Principle
  • Demo: Standing Wave, Quantum Model; Electron Waves
  • Quantum Mechanical Model of the Atom
    == Very mathematical
    == Modeled electrons as waves
    == Electrons are located in "orbitals"
    == Each orbital has a unique energy
    == Each e- is described by a set of 4 quantum #s
    == Packet, pp. 7-8
  • Unit 3 Test (60 minutes)



Homework:   
>> Friday, November 15 <<




Next Time in Class

>> Tuesday, November 19 <<

We will finish up the discussion of Bohr's Quantum Model and line spectra.  We will look at why it failed and the attempt of Quantum Mechanics to replace Bohr's theory and avoid its pitfalls (pp. 5-6). We will discuss quantum numbers, orbitals, and electron addresses (pp. 7-8).




Periodic Tables

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






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