What are to have on the table for today: Science notebook Study Guide Handout

Nov. 13—Criterion A Unit 2 Test LT2b Radioactivity Fri., Nov. 7th A Day EQ 1: What questions do I still have about radioactivity? 2: Why is the documentary titled, Quantum Leap? Nov. 13—Criterion A Unit 2 Test LT2b Radioactivity Agenda: Discuss material in the study guide for LT2b. Watch Quantum Leap with Brian Greene and take notes. DUE as you leave—half-sheet Homework: Study for the test by completing the study guide and making corrections. Study Guide is DUE as you enter to take the test. Study Guide is evidence toward your behavior grade for STEM Chemistry.

Alpha Decay Questions Can I explain the alpha decay process? Can I explain what half-life means in terms of single particles and larger samples?

1.If you read a test question that says: Hg-202 undergoes alpha decay to Pt-198. What does that tell you? A particle that has a mass of 4 is emitted A particle that has a mass of 4 is absorbed “emitted” is another way to say “given off”

Hg-202 undergoes alpha decay to Pt-198. 2. What else do you know? The particle emitted also has no charge The particle emitted also has a charge of +2 The particle emitted also has a charge of + 4 The particle emitted also has a charge of -2 Alpha particles are represented as Charge of plus 2 which I know because the subscript represents # protons or charge on the particle

Hg-202 undergoes alpha decay to Pt-198. 3 Hg-202 undergoes alpha decay to Pt-198. 3. What would the reaction look like? Hg-202 Pt-198 + Remember mass and charge must be equal on both sides of reaction

4. If you know the half-life of a substance is 50 seconds and the initial amount can be represented as which can you know for certain? After 50 seconds the representation would be After 50 seconds the representation could be If the sample size is small, it could be very different after 50 seconds. A and C B and C E show on sim

5. If you know the half-life of a substance is 50 seconds and the initial amount can be represented as what would you predict the graph to look like after 150 seconds? D nothing would be left C because 3 half lives have passed so there is 50/25/12.5% after 3 half lives B C A

Quantum Leap Do: Watch and take notes in your notebook What are the main points or ideas? Which system is emphasized—electron cloud or the nucleus? WHO from the timeline task is mentioned in the documentary? Put: on the half-sheet—write at least 3 questions you have about the main ideas Time: 50 minutes run time When Done: turn in half sheet as you leave