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2. Entry Task Explain Rutherford’s experiment in 3 sentences or less using ALL the following words: Gold foil, alpha particles, nucleus, empty space, rebound, target, protons, electrons, positive, negative, high speed

3. Super Model 2: Math Model Start a new thread/topic Learning Target: I can calculate the dimensions needed to build a scaled model of an atom. Update TOC

4. Super Model 2 Read Intro p. 171-172 We’re going to calculate the dimensions of an atom, and then build a scaled physical model. Read “Making Math Models” p. 172

5. Super Model 2 If you work for $15 per hour, how much would you make after 10 hours of work?

6. Super Model 2 Isopropyl alcohol has a density of 0.8 grams per milliliter. What is the mass of 400 milliliters of isopropyl alcohol?

7. Super Model 2 For a camping trip, you need 0.5 gallons of drinking water per day. The density of water is 8.2 pounds per gallon. What is the mass of water you would need for a 4 day trip?

8. Super Model 2: P&P #3a Suppose an alpha particle travels at 3.0x10 7 meters per second (m/s). How far does it travel in 4.2x10 -5 seconds?

9. Super Model 2: P&P #3b Do you think that Rutherford designed his experiment so his alpha particles took 4.2x10 -5 s to reach the gold foil? Explain.

10. Super Model 2: P&P #3c Suppose Rutherford’s lab was 10m long. How much time would he plan on the alpha particle taking to move from the source to the target?

11. Super Model 2: P&P #3d Suppose the distance between gold nuclei is 50x10 -9 m and it took 1x10 -15 s for the alpha particle to pass through the 1-atom-thick foil. How fast was the particle travelling?

12. Super Model 2: P&P #4 Your turn to come up with a mathematical model to help us build a scaled model of an atom.

13. Super Model 2: P&P #4 We are going to use Spidey as the nucleus of our physical model, but we need to calculate how much rope to buy to make the edge of our atom. nucleus Outer edge where electrons are located (rope)

14. Super Model 2: P&P #4 First we need to find the volume of our nucleus for our scaled model. Radius = Diameter/2 Volume sphere =(4/3)πr 3

15. Super Model 2: P&P #4 Volume of our scaled nucleus Volume of the atom we are building ›Mathematical model exampleMathematical model example Hydrogen nucleus Hydrogen atom

16. Super Model 2: P&P #6b How many nuclei could fit into an atom?

17. Super Model 2: P&P #6c If the volume of the nucleus is tiny compared with the volume of the atom, what is it about the nucleus that is large? How do you know?

18. Super Model 2: R&C p. 174-175 Answer R&C #1-3 and 5. You do NOT need to answer #4.