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Accelerated Chemistry Atomic Structure Activity For this assignment, you will be doing some research about scientists who contributed to our current understanding of the atom. There are many scientists whose discoveries paved the way for all of us who study chemistry. You will work in groups of two or three and will be assigned one such scientist to research. Ultimately, your goal is to create an electronic presentation that details the contribution to the development of a model of the atom that your scientist made. For each of the following scientists state 1. 2. 3. 4. the problem with the previous model the experimental design used (if any) the evidence (data) that led to a change in the previous model how each scientist developed a new atomic model that a. incorporated the new evidence OR b. resolved a flaw in the previous model You should also find out some interesting tidbits about the scientist's life and weave those into the story you are telling about your assigned contributor. This is the one opportunity you have in chemistry to be colorful, so take advantage of it! Two class periods will be devoted to preparing your story. On the third day, all groups will tell their story to the class and we will create a timeline of contributions and we will trace the "model" of the atom through its historical development. You will be graded on the quality of your presentation and accompanying diagrams as well as how well you know your story. During the presentations of other groups, you will be expected to pay attention, take notes and contribute to this whole class discussion. Scientists: Robert Millikan—Millikan Oil Drop Experiment Ernest Rutherford—Gold Foil Experiment Max Planck—Energy Discovery (Planck’s Hypothesis) Albert Einstein—Photoelectric Effect Niels Bohr—New Model of the atom Werner Heisenberg—Heisenberg Uncertainty Principle Henry Mosley—Atomic Number James Chadwick—Neutron FW Aston—Mass Spectrometer Grading Rubric: (50 pts.)—Test/Quiz Category Scientist Background (5 pts.) Country of origin; schooling, age at discovery, other research and scientific discoveries, other scientists he worked with, any unusual facts or other interests of the scientist. Experiment Purpose of the scientists work. ( 5 pts.) Detail what the scientist was trying to solve. What question did he have and answer? Computer Illustration or Simulation ( 5pts.) Illustration/Simulation explains experiment correctly Scale is large enough to see and interpret The group can explain all parts of the simulation/illustration. Explanation (10 pts.) Explain the purpose of the experiment. In other words, explain what the scientist was seeking to know. Explain the experiment set-up and important parts of the set-up as well as key interactions among particles in the experiment Includes a complete understanding of the results of the experiment. Conclusion (10 pts.) Connect the experimental results to how the results improved our understanding of the atom Covered all the conclusions from the experiment Relate findings from the specific experiment to all atoms. Presentation Delivery (5 pts) Effective delivery of information including good eye contact with class (not just me), an enthusiastic voice and being an overall effective communicator. Individual Grade (10 pts.) Students in each group will grade the effort and contribution made by each other member. I will also give each person a grade based on effort I see in class on work days. Useful URL’s Timeline (View the proper sequence of the evolution of the model of the atom.) http://atomictimeline.net/index.php Here is an overview of the development of the modern model of the atom http://www.colorado.edu/physics/2000/quantumzone/lines2.html JJ Thomson’s Model http://atomic-molecular-optical-physics.suite101.com/article.cfm/the_discovery_of_the_electron http://www.atomicarchive.com/Bios/Thomson.shtml http://www.chemheritage.org/classroom/chemach/atomic/thomson.html http://www.chemteam.info/AtomicStructure/Thomson-Model-Intro.html Rutherford’s Model Follow the instructions while viewing this simulation of Rutherford’s experiment. http://www.mhhe.com/physsci/chemistry/essentialchemistry/flash/ruther14.swf Here is another simulation that illustrates the Gold Foil experiment. http://micro.magnet.fsu.edu/electromag/java/rutherford/ Which atomic model is used to illustrate the experiment ? Why is this atomic model used instead of the Thompson’s (previous model)? More information on Rutherford’s Model http://www.rsc.org/chemsoc/timeline//pages/1911.html Bohr’s Model http://science.sbcc.edu/physics/solar/sciencesegment/bohratom.swf http://www.pbs.org/wgbh/aso/databank/entries/dp13at.html http://chemistry.about.com/od/atomicstructure/a/bohr-model.htm What were the limitations of Rutherford’s atomic model that prompted Bohr to propose additional features? Contributors Robert Millikan—added to our knowledge of electrons http://www.juliantrubin.com/bigten/millikanoildrop.html http://ffden-2.phys.uaf.edu/212_fall2003.web.dir/Ryan_McAllister/Slide3.htm View this video: http://www.learnerstv.com/animation/animation.php?ani=186&cat=chemistry Max Planck—contributed to Bohr Model http://www.spaceandmotion.com/Physics-Max-Planck.htm http://www.pbs.org/wgbh/aso/databank/entries/dp00qu.html https://www.boundless.com/chemistry/introduction-to-quantum-theory/the-nature-of-light/planck-squantum-theory/ Albert Einstein—Contributed to Bohr Model http://www.aip.org/history/einstein/essay-photoelectric.htm http://www.physlink.com/Education/AskExperts/ae24.cfm http://www.daviddarling.info/encyclopedia/E/Einstein_and_photoelectric_effect.html Werner Heisenberg—what did it do to Bohr Model? http://aip.org/history/heisenberg/p08.htm http://www.pbs.org/wgbh/aso/databank/entries/dp27un.html http://theconversation.com/explainer-heisenbergs-uncertainty-principle-7512 Henry Mosley http://www.chemteam.info/AtomicStructure/AtNum-AtWtThread.html http://www.mikeblaber.org/oldwine/chm1045/notes/Periodic/Develop/Period01.htm http://www.chemteam.info/AtomicStructure/AtNum-Moseley.html http://www.tutorvista.com/content/physics/physics-iv/atoms-and-nuclei/moseleys-law.php http://www.sooperarticles.com/technology-articles/moseleys-discovery-modern-concept-atomic-number327.html James Chadwick http://atomic-molecular-optical-physics.suite101.com/article.cfm/the_discovery_of_the_neutron http://www.thocp.net/biographies/chadwick_james.htm http://www.pbs.org/wgbh/aso/databank/entries/dp32ne.html http://www.vias.org/physics/bk2_05_05.html http://www-outreach.phy.cam.ac.uk/camphy/neutron/neutron1_1.htm FW Aston http://chemed.chem.purdue.edu/genchem/history/massspec.html http://antoine.frostburg.edu/chem/senese/101/atoms/faq/how-does-mass-spec-work.shtml http://www.chemheritage.org/research/policy-center/oral-history-program/projects/mass-spectrometry.aspx Grading Rubric: (50 pts.)—Test/Quiz Category Scientist Background (5 pts.) Country of origin; schooling, age at discovery, other research and scientific discoveries, other scientists he worked with, any unusual facts or other interests of the scientist. Experiment Purpose of the scientists work. ( 5 pts.) Detail what the scientist was trying to solve. What question did he have and answer? Computer Illustration or Simulation ( 5pts.) Illustration/Simulation explains experiment correctly Scale is large enough to see and interpret The group can explain all parts of the simulation/illustration. Explanation (10 pts.) Explain the purpose of the experiment. In other words, explain what the scientist was seeking to know. Explain the experiment set-up and important parts of the set-up as well as key interactions among particles in the experiment Includes a complete understanding of the results of the experiment. Conclusion (10 pts.) Connect the experimental results to how the results improved our understanding of the atom Covered all the conclusions from the experiment Relate findings from the specific experiment to all atoms. Presentation Delivery (5 pts) Effective delivery of information including good eye contact with class (not just me), an enthusiastic voice and being an overall effective communicator. Individual Grade (10 pts.) Students in each group will grade the effort and contribution made by each other member. I will also give each person a grade based on effort I see in class on work days.