1. Unit 1.2: Antoine Lavoisier and the History of the Atom

2. Bell Work: September 2
Summarize the Law of the Conservation of Matter/Mass in two sentences
If you finish early, study for your quiz
Remind me about Good Things!

3. Lavoisier Video
Law of Conservation of Mass Video

4. Definitions: Antoine Lavoisier Article
Ferme Generale was a private company that collected taxes for the Crown
Phlogiston Theory was the theory that there was a substance called phlogiston which was odorless, tasteless, colorless, and weightless. This substance was thought to be given off when the material containing this substance was burned.
Calx is the crumbly residue left over after a mineral or metal has been heated.

5. Antoine Lavoisier Web
With the person sitting next two you (at your table of 4), write 2 facts from the biography on each of the four subtopics of the web.

6. Models of the Atom
With the person sitting next to you (in your table of 4) put the atomic model cards in chronological order.
On a sheet of paper with both of your names on it, write the following:
List the order of the models
Compare and contrast each of the models. What is the difference between each one? What is similar about each one? Be extremely detailed in your explanations. Write in full sentences.
For each model, explain your reasoning for the placement of the model. Be specific and descriptive. Write in full sentences.

7. Create an atomic Model Flip Chart
Inside
Outside
Picture
Description
Experiment
Place your paper on your desk horizontally
Fold both sides towards the center
Cut the flaps into thirds horizontally
Label like the pictures (leave room to write on the inside flaps)
Democritus
Rutherford
Dalton
Bohr
Thomson
Present Model

8. John Dalton Atomic Model
September 1766-July 1844
He was an English chemist, meteorologist, and physicist best known for reviving the atomic model and research into color blindness

9. John Dalton Atomic Model
Elements are made of extremely small particles called atoms
Atoms of a given element are identical in size, mass, and other properties.
Atoms cannot be subdivided, created, or destroyed
Atoms of different elements combine in simple whole number ratios to form chemical compounds
In chemical reactions, atoms are combined, separated, or rearranged.

10. J.j. Thomson Discovers the electron
The electron was the first subatomic particle discovered
Used a cathode ray tube
Cathode Ray Tube Video
Electricity enters the cathode and comes out the anode in a vacuum tube (no air in the tube)
A beam of light called the “Cathode Ray” can be seen
This ray can be repelled or attracted using magnets
Repel= negative side of magnet
Attract = positive side of magnet
This means that the ray must be negative (opposites attract)
Ray = 1000x lighter than Hydrogen atom
First subatomic particle!