These lesson plans are meant to accompany my Atomic Theory 11 Teachers Pay Teachers products, but can be useful to any Chemistry 11 teachers looking for ideas for their classes. Remember that this content is specifically geared toward the Canadian (BC) curriculum!
This unit on Atomic Theory covers:
- Early Atomic Theory
- Review of calculating subatomic particles
- Review of basic Bohr and Lewis diagrams
- Electron Configuration
- Lewis diagrams involving formal charge
- Molecular Geometry (VSEPR Theory)
(all lessons are planned based off 80 minute blocks)
Lesson 1-2
- Have students brainstorm what they remember about chemistry from last year (20 min)
- Option 1: Do a brainstorm on the board
- Option 2: Have them work in groups to write down words they remember about chemistry on a piece of paper then have them do a walk around to look at other group’s words
- Option 3: Do a word splash - Have students get into 8 groups and assign each group one of the following: Democritus, Aristotle, John Dalton, JJ Thompson, Ernest Rutherford, Niels Bohr, Erwin Schrodinger, James Chadwick (5 min)
- Have students research their assigned person, specifically how they contributed to atomic theory. Students should make a 3 page google slide show to present to the class that contains the following information:
- Dates
- 2 photos of the scientist
- Any major experiment they conducted (experiment described in detail - maximum of 1) and what new information that revealed about the nature of matter.
- Description, with photos, of what the current accepted model of the atom looked like before and after the discovery.
(Students who are assigned Democritus/Aristotle can just explain more detail about the ideas and theories these philosophers had as there was no model of the atom or experiments) - Give students the rest of class to begin this, then half of the following class for them to it up (they can use this time to practice presenting if they finish early), followed by presentations in the same order the scientists are listed above (in chronological order). This is an informal exercise and does not need to be marked, however participation marks or a fast checklist could be done to ensure students take it seriously.
Lesson 3-4
Prep: prepare flame test demo in advance (prepare solutions, soak skewers in each solution overnight, set out bunsen burner, beaker of water, and clear gas lines of air if needed in advance)
- Recap from last class: (5-10 mins)
Who was the first person to propose that matter is made of particles?
Who did the gold foil experiment?
Who first proposed atomic theory? - Hand out lesson 1 student notes (2 min)
- Start going over Google slide notes (20-30 mins)
Can pause to watch videos about the experiments: Cathode Ray (10 min) and Gold Foil (15 min)
Can also pause on the “atomic theory” slide to ask students what they think isn’t true for our understanding of chemistry today (ex: atoms can be further divided, not all atoms of the same element weigh the same)
- Do flame test demo (10-15 mins) (could also be done as a lab)
- The flame test shows that different elements burn different colors - demonstrating the emission spectra that Niels Bohr’s found and used to develop his model. The specific colors correspond to specific wavelengths (amount of energy being released), which corresponds with the difference in energy between electrons in different orbitals (energy levels).
- Watch The History of Atomic Chemistry: Crash Course Chemistry #37 (10 mins)
- If time: have students do a pair share about things mentioned in the video that were new different from the information they found online and/or the notes (5-10 mins)
- Question: How does the development of atomic theory demonstrate the scientific method?
For students who miss class, Models of the Atom Timeline by Tyler Dewitt on Youtube is a good video for walking students through the information (he also has separate videos on the Cathode Ray Tube and Goil Foil Experiments)
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