Y11 Atoms 2

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Y11 Atoms 2

  1. 1. What is the most important fact in all of science? Come up with your own suggestion
  2. 2. Atoms Atoms an Heat Lesson 3 Year 11 Physics
  3. 3. Richard Feynman 1918 - 1988 Six easy pieces ―All things are made of atoms—little particles that move around in perpetual motion, attracting each other when they are a little distance apart, but repelling upon being squeezed into one another. ―
  4. 4. ―Fiction Physics‖ Ernst Mach 1838 - 1916 ―Atoms are things which can never be seen or touched and only exist in our imaginations‖ ―Have you seen one?‖ How can, one generation after scientists doubt their existence, atoms be considered the most important fact in all of science?
  5. 5. What is the atomic model? It is not just that everything is made out of tiny spheres (balls). There are different types of balls; atoms, molecules and ions. The balls are moving. It is called particle theory or kinetic theory Atoms intro
  6. 6. Why do scientists think they exist? Example of a allegorical model First ―used‖ by John Dalton to explain the ratios of products produced in chemical reactions. As a model it explains and predicts most of material science (chemistry) and tons of physics. It works!
  7. 7. Any evidence? It is not possible to ―see‖ atoms. They are smaller than the wavelength of light. There is other evidence. 1. Brownian motion 2. Gas diffusion Have you seen one? Can a crime be prosecuted without witnesses?
  8. 8. Atom images We can now produce images of atoms using scanning tunnelling microscopes (STM)
  9. 9. Using kinetic theory Success Criteria… Use the ideas of kinetic theory to explain Brownian Motion or Gas Diffusion. Your explanation must - include diagrams - describe the macroscopic event and why it is strange - use the idea of moving invisible microscopic particles
  10. 10. Diffusion in liquids Watch the video clip Diffusion in liquids Success Criteria Explain the results of the experiment. Use the ideas of kinetic theory Use diagrams
  11. 11. Demonstrate your learning – Dear Mr Mach Write a letter to Ernst Mach The purpose is to convince him that atoms exist. They are not just a useful model Success Criteria Letter has an introduction Use examples and evidence Letter has a conclusion Uses key words precisely

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