STEM Chemistry at GBS
Home Page

Home || Schedules || Laboratory || File Cabinet || Quiz Room || Helpful Resources

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.

The End is Near - And Nearer Than Once Believed

Unit 3 Test is Coming.Don't be too alarmed, but just so you know ... the end of the unit is very near. The Unit 3 Stoichiometry Test will be taken on Tuesday, November 13. More information will be provided about the test later this week.

FYI: The unit will end on Wednesday, November 7 with possibly a few loose ends to clean up on Friday. We will use most of the day on Friday, November 9 to start Unit 4. The majority of the block on Tuesday, November 13 will be spent taking the Unit 3 Test.

The Unit 3 Test includes 15 multiple choice questions, five multi-part conversion/stoichiometry problems, and a multi-part Lab question. The Lab question provides data from a lab similar to one that we did. The data must be analyzed to determine the answer to the Lab question; rules of significant digits must be followed.

The problems include some short grams <==> moles <==> atoms conversions, some basic stoichiometry, a multi-factor conversion factor problem, a couple of limiting reactant problems, an excess reactant problem, and a % yeid problem. Prepared students will do very well and see not surprises.

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:

Stoichiometry 5

Hey get this! There's a WebAssign due on the Test Day; its called Stoichiometry 5. I will make it an optional WebAssign. If you don't do it, then it will go into the Gradebook as excused. If you do it, then you will earn yourself a 4th WebAssign throw-out.

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.

Quiz Key

The key for last Thursday's Quiz is available online. View Key.

The quiz was a 30-point quiz. Point values are as follows: Q#1: 3 pts; Q#2: 4 pts;  Q#3: 4 pts;  Q#4: 8 pts;  Q#5: 3 pts; and Q#6: 8 pts. Partial credit was given based upon the quality of work and the level of understanding that it reveals. Good quality work is visible, follow-able, and reveals an understanding of the practices taught in class. All judgements are final.

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

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 shared 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.

Google Classroom ... Revisited

You should all have Google Classroom accounts. You will need it to do the Crash of Avogadro Airlines Floight 1023 Project. Here are the Course Codes:

Block 1 Chemistry: 3rjmzu

Block 2 Chemistry: h95yke

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.)

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

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.

    Online Homework


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

Today in Class

>> Friday, November 9 <<

Focus Question(s):
  • What is a quantum model of the atom and what was the experimental evidence that led to its acceptance?

  • Pick up Packet
  • Discuss Tuesday's Test
  • Urine Trouble; Something to Be Excited About
  • Intro to Unit 4: Atomic and Molecular Structure
  • Probing the Atom History: Thomson, Rutherford, Bohr, and More
  • Wavelength-Frequency-Energy - Demos; p. 3, Q#1-3
  • Discuss Wave-Particle Duality (TedED video); Image; Plank's Equation; line spectra; Packet, p. 3, Q#4-5
  • Bohr's Quantum Model of the Atom: Video; Packet, p. 4; Confetti Demo
  • Check Reading Guide - pp. 1-2
  • Lab AMM1 - Elemental Fingerprints

  • WebAssign: Stoichiometry 5 (OPTIONAL)
  • Prepare for Unit 3 Test


  • Maybe next year. Stop back then.
  • Or go check out Tyler DeWitt You Tube Channel or Hank Green's Crash Course Chemistry.

Next Time in Class

>> Tuesday, November 13 <<

We will do a little Bohring math. We will discuss the good, the bad, and the ugly of the Bohr model. We will watch a couple of short video clips. We will take the Unit 3 Test.

Periodic Tables

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

Home || Schedules || Laboratory || File Cabinet || Quiz Room || Helpful Resources