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Radioactivity

Radioactivity

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Radioactivity

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  1. Paul Charpentier Foxboro High School Foxboro, MA pcharp@massed.net Patricia Brandl Medford High School Medford, MA Pattygrace1@aol.com Radioactivity

  2. Traditional Coverage • Review of atomic structure • Comparison of radioactive emission processes • Transmutation reactions • Half-life

  3. Enhancement to Curriculum • Allows students to observe simulated decay of atoms in real time • Activity emphasizes random nature of radioactive decay

  4. Intended Audience • Standard (college-prep) one-year chemistry course • Unit includes enrichment aspects for honors-level classes • Aligned to Massachusetts Science Frameworks (Chemistry2.3, 2.8, 2.10, 2.11) and MCAS • Possible interdisciplinary aspects with Social Studies

  5. Adaptations • Simulab also appropriate for demonstration use • Conceptually, can be used by Freshman Physical Science courses

  6. Placement in the Curriculum • Includes enhancement for a traditional unit which is done after the Atomic Structure Unit • SimuLab will follow traditional hands-on simulation of half-life • Reviews/reinforces graphing skills

  7. Resources • Classroom Facilities: • Wet lab materials, Geiger counter, radioactive sources (Uranyl acetate, Thalium, Coleman lantern mantles) • Computer Resources: • Demonstration-use: PC with computer projector • Computer-Lab: one machine per 2 students, (teacher PC with computer projector, optional)

  8. General Goals and Objectives • Student will compare and contrast the three products of radioactive decay (a, B, g) • Predict the products of transmutation reactions and balance accordingly • Describe the randomness and fixed rate at which isotopes decay

  9. Nuclear reactions Graphical Organizer of Decay Modes Shielding Geiger Counter Demo Cloud Chamber Demo Writing Nuclear Reactions Half-Life Sweet Decay Lab Half-Life SimuLab Half-life Problem Solving Carbon-14 dating Instructional Activities

  10. Chronological Outline Day 1: Graphical Organizer of Decay Modes (a, B, g) Day 2: Demos: Demo Shielding with Geiger Counter, Cloud Chamber Day 3: Writing Nuclear Reactions (review isotope symbolism) to illustrate kinds of transmutation

  11. Chronological Outline (cont.) Day 4: Sweet Decay Lab Day 5: Half-life SimuLab Day 6: Social Issues: Carbon-14 Dating, Nuclear Waste Disposal Day 7: Assessment

  12. Assessments • Rubrics for wet lab and SimuLab • Rubric for demonstration • Nuclear equation/half-life problem session • Traditional teacher-generated test/quiz • Optional social studies tie-in (social issues) research project