Unit 1.2: Antoine Lavoisier and the History of the Atom

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Presentation transcript:

Unit 1.2: Antoine Lavoisier and the History of the Atom

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!

Lavoisier Video https://Lavoisier Law of Conservation of Mass Video

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.

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.

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.

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

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

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.

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!