2. Class is silent until you are allowed to speak about Chemistry. Once you cross into the classroom, you are silent: pick up your papers, go to your seat, and get started on the catalyst. Questions are asked with a raised hand There is no talking during transitions (i.e. take out a paper) When in doubt, DON’T TALK. Supply Boxes will be checked at the beginning and end of class. 4 markers, 2 gluesticks, 1 pair of scissors Tables should be clean and will be checked at the beginning and end of class. No pencil/pen markings

3. Catalyst 9/23-24 1) TAKE OUT THE FOLLOWING: Binder, Planner, homework 2) Use your understanding of trends to explain why: Sulfur (S) has a higher ionization energy than Phosphorus (P). 3) On a spare sheet of paper, copy the prompt for journal #2: “Evaluate whether the periodic table is a useful way of organizing the elements.” Copy HW in Planner: 1)Organize Unit 1 in Binder (Notes, worksheets, lab) 2)Write journal #2 3)Nuclear WS

4. Vocabulary you must use in your journal. Metals, nonmetals, semimetals, ionization energy, electronegativity, atomic radius, alkali metals, alkaline earth metals, transition metals, halogens, noble gases, shells, valence electrons

5. Notes #7 Nuclear Chemistry Alpha, Beta, Gamma Decay (Only paraphrase what’s in YELLOW!!!)

6. FOCUS QUESTION: Now we know what part of the atom is involved in chemical reactions, what happens when you disrupt the nucleus of an atom? 

7. A nuclear bomb went off in downtown LA… (5 miles from here) What if…

8. Nuclear Bomb Clips

9. New Mexico Nuclear Testing Diablo Canyon Nuclear Power Plant (near San Luis Obispo, CA)

10. Nuclear vs. Chemical Reactions… 2. NUCLEAR Nucleus Reactions involve the nucleus Releases MUCH MORE Energy (Radiation) 1. CHEMICAL Chemical reactions only involve the valence electrons (outside) Releases Less Energy

11. Nuclear Reaction A reaction that involves a change in the nucleus of an atom Radiation: Process by which materials give off rays

12. What are the 3 main types of radiation? Alpha radiation (Stopped by a piece of paper) ()() Gamma radiation High energy – like X-rays Can go through most materials easily & most damaging (stopped only by lead) Beta radiation Can penetrate 1 cm into skin (stopped by cardboard)  

13. Skin or Paper

14. How Radioactive are You Worksheet? After you have added up your mrems of exposure, compare yourself to the scale to see how radioactive you are: 360 mrem = Normal exposure from natural surroundings 500 mrem = Astronaut 1000 mrem = Nuclear power plant worker 80,000 mrem – 1,600,000 mrem = Chernobyl nuclear meltdown victim

16. 3 Nuclear Particles & Decay (Interactive Notes) Particle 1. Alpha  2. Beta  3. Gamma Exampl e Practice He 4242 e 0  0

17. 1. Alpha Decay Equations U 92 238 Th 90 234 He 2 4 Alpha particle released New Radioactive Atom + Practice: 1. 234 4 Th He + 90 2_____________ 2. 226 4 Ra He + 88 2_____________ 88 230 Ra 86 222 Rn

18. The Radiation has changed one element into another 2. Beta Decay Equations P 15 26 e 0 + ? Si 14 26 An electron is emitted when UNSTABLE atom “decays” into …

19. Beta Decay Practice: Beta Practice: 0 e + -1 140 Ce 58 140 Pr 59

20. 3. Gamma Decay If Gamma Decay occurs, no net change in the equation will happen! Why? Because Gamma rays are dangerous photons of light (light particles) & have no mass or charge.

21. PARTNER PRACTICE

22. If extra time…