Reaction Rates: Temperature, Concentration, and Catalysts in Collision Theory, Study notes of Chemistry

Download Reaction Rates: Temperature, Concentration, and Catalysts in Collision Theory and more Study notes Chemistry in PDF only on Docsity! Lesson Sequence Planning Length of lesson sequence: Three weeks Essential Question: How can the collision theory may be used to explain the decomposition of hydrogen peroxide used to estimate the concentration of household bleach through a simple reaction and the action of a catalyst? (student goals: to understand the effects of changing the temperature or concentration of the reacting particles on the rate at which a reaction occurs?) [Clarification Statement: Emphasis is on student reasoning that focuses on the number and energy of collisions between molecules.] [Assessment Boundary: Assessment is limited to simple reactions in which there are only two reactants; evidence from temperature, concentration, and rate data; and qualitative relationships between rate and temperature.] Science & Engineering Practices- Skill What skills does the student need to complete the SEP? • Apply scientific principles and evidence to provide an explanation of phenomena and solve design problems, taking into account possible unanticipated effects Disciplinary Core Idea - Topic Chemical processes, their rates, and whether or not energy is stored or released can be understood in terms of the collisions of molecules and the rearrangements of atoms into new molecules, with consequent changes in the sum of all bond energies in the set of molecules that are matched by changes in kinetic energy. Cross Cutting Concept – Evidence to support claim How does it make sense? How does it connect? Patterns • Different patterns may be observed at each of the scales at which a system is studied and can provide evidence for causality in explanations of phenomena. Students are Engaged: What is going to be used to engage students? What is happening? Why do you think this is happening? Check for prior knowledge. (see 5E handout) https://www.youtube.com/watch?v=C5tOEBmBAHg Iodine Clock reaction https://www.youtube.com/watch?v=1TWAR1KtYJU I Didn't Know That - Blowing Up an Airplane Tire Students Explore(What are the TOOLS used by students to explore): Suggested Grouping Reading: Catalyst in Living Organisms Enzymes http://www.rsc.org/learn-chemistry/resource/res00000815/enzymes-and-jellies?cmpid=CMP00000909 http://www.absorblearning.com/chemistry/demo/units/LR1506.html http://www.hhmi.org/biointeractive/lactose-digestion-infants http://www.hhmi.org/biointeractive/natural-selection-lactose-tolerance Catalyst Speed up reactions and Inhibitors slow down a reaction http://www.chem4kids.com/files/react_catalyst.html http://sciencelearn.org.nz/Contexts/Nanoscience/Sci-Media/Video/Catalytic-converters-and-platinum-nanoparticles Effect of temperature changes in reaction rates http://www.middleschoolchemistry.com/multimedia/chapter6/lesson4 http://study.com/academy/lesson/rate-of-a-chemical-reaction-effect-of-temperature.html?seekTo=1:10 https://archive.org/details/DrMattJCarlsonScienceTheaterEp005Temperature_0 Concentration changes and reaction rates http://www.docbrown.info/page03/3_31rates3a.htm http://www.kentchemistry.com/links/Kinetics/FactorsAffecting.htm Hydrogen Peroxide and its use http://www.ch.ic.ac.uk/rzepa/mim/environmental/html/h2o2_text.htm http://www.h2o2.com/municipal-applications/drinking-water-treatment.aspx?pid=123 http://www.diyncrafts.com/10960/health/51-extraordinary-everyday-uses-for-hydrogen-peroxide Bleach https://www.rhfs.com/pulse/thermoplastics-solve-the-challenges-of-water-disinfection-using-sodium-hypochlorite/ http://www.oxy.com/OurBusinesses/Chemicals/ResponsibleCare/Documents/Sodium%20Hypochlorite.pdf Video: Hydrogen Peroxide Videos https://www.youtube.com/watch?v=NN2tHSkcObk https://www.youtube.com/watch?v=NI4uL4JN51c https://www.youtube.com/watch?v=uZCCwWx0Z0o Bleach Videos https://www.youtube.com/watch?v=seOe1ythYbQ Writing: Informational Essay answering the essential question with citations to supportive evidence. Hands-on: Three experiments to obtain data and understand reaction rates. Estimating the concentration of bleach by determining its conductivity, measuring oxygen gas pressure, measuring the oxidation reaction potential change and concentrations Titration and conductivity of Bleach http://www2.vernier.com/sample_labs/CHEM-I-19-redox_titrations_open.pdf Estimating the concentration of Bleach reacting with Hydrogen Peroxide http://www.rsc.org/learn-chemistry/resource/res00001729/estimating-the-concentration-of-bleach?cmpid=CMP00005243 Reaction Rates of Hydrogen Peroxide http://www.vernier.com/files/sample_labs/CHEM-I-22-reaction_rates_open.pdf Students Explain (What key concepts students should be able to explain?) guided Questions to explain real situations: The Theory of Kinetic Energy. The Collision Theory. What factors influence the frequency of collisions of reactant molecules? Why do these factors influence reaction rates? What is the rate of reaction? How does the collision theory describe rates and changes in rates of chemical reactions? What is the role a catalyst plays in increasing the reaction rate? How is that achieved? What is the role of activation energy in a chemical reaction? How can potential energy diagrams be used to determine if a chemical reaction is endothermic or exothermic? Students Elaborate (what activities can students do to expand, enrich, and connect/apply to real world situations) Students can learn about Lactose intolerance and enzyme mediated reactions. Students can learn about how catalytic converters work and why are do they have a high price.