Understanding by Design Stage 1 - Desired Results

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					Department: Science                     Understanding by Design                                Course: AP Chemistry
      Standard(s): State Frameworks:
      12.11.56 Understand that the conservation of atoms in a chemical reaction, as summarized in a balanced chemical
      equation, leads to the ability to calculate theoretical masses of reactants and products.
      12.11.57 Understand how to read, interpret, predict and balance chemical equations.
      12.11.61 Understand that among other definitions of acids and bases, acids are hydrogen-ion-donating and bases are
      hydrogen-ion-accepting substances.
      12.11.98 Understand that carbon dioxide increases the greenhouse effect in our atmosphere and that it is produced
      whenever carbon-containing fuels are burned (e.g., wood, coal, charcoal, oil, natural gas). Understand that removing
      forests removes trees which absorb carbon dioxide and release oxygen.

      National Science Standards
      NSES B3a Chemical reactions occur all around us, for example in health care, cooking, cosmetics, and automobiles.
      Complex chemical reactions involving carbon-based molecules take place constantly in every cell in our bodies.
      NSES B3b Chemical reactions may release or consume energy. Some reactions such as the burning of fossil fuels release
      large amounts of energy by losing heat and by emitting light. Light can initiate many chemical reactions such as
      photosynthesis and the evolution of urban smog.
      NSES B3c A large number of important reactions involve the transfer of either electrons (oxidation/reduction reactions)
      or hydrogen ions (acid/base reactions) between reacting ions, molecules, or atoms. In other reactions, chemical bonds are
      broken by heat or light to form very reactive radicals with electrons ready to form new bonds. Radical reactions control
      many processes such as the presence of ozone and greenhouse gases in the atmosphere, burning and processing of fossil
      fuels, the formation of polymers, and explosions.
      NSES B3d Chemical reactions can take place in time periods ranging from the few femtoseconds (10-15 seconds)
      required for an atom to move a fraction of a chemical bond distance to geologic time scales of billions of years. Reaction
      rates depend on how often the reacting atoms and molecules encounter one another, on the temperature, and on the
      properties—including shape—of the reacting species.
      NSES B3e Catalysts, such as metal surfaces, accelerate chemical reactions. Chemical reactions in living systems are
      catalyzed by protein molecules called

                                            Stage 1: Desired Results
S                                                       Understandings
T     Students will. . .
      1. Identify the factors which affect reaction rates. (i.e. Temperature, Concentration, Surface Area, & Catalyst)
A     2. Be able to sketch a reaction profile for an endothermic and exothermic reaction. Understand how a catalyst provides
G     an alternate pathway at a lower activation energy and sketch a catalyzed pathway on the reaction profile. Remember that
      a catalyst does not affect the enthalpy of a reaction. Be able to determine the activation energy for the reverse reaction
E     from the reaction profile.
      3. Understand the Maxwell-Boltzmann distribution plot of energies and how an increase in temperature increases the
      number of effective collisions.
1     4. Calculate the rate of production of a product or consumption of a reactant using mole ratios and the given rate.
      5. Determine the rate law for a reaction from given data ([Conc] vs. rate). Be able to determine the overall order and the
      value of the rate constant (including the correct units of the rate constant.)
      6. Use integrated rate laws to determine the concentrations at a certain time,t, and be able to determine the half-life of a
      7. Be able to use graphs of data (Conc. vs. time) to determine the order of a reaction.
      8. Be able to write the rate law from a given mechanism given the speeds of each elementary step.
      9. Be able to write the overall reaction from a mechanism and identify catalysts and intermediates present.
      10. Graphically determine the activation energy using the Arrhenius equation.
                      Essential Questions                                              Knowledge & Skill
    1.   How rapidly does a reaction progress?                     Using established learning targets to guide the unit, the
    2.   How do you express the rate of a chemical reaction?       accompanying knowledge & skill sheet establishes the
    3.   What are factors that affect the rate of a reaction?      goals set by the course
    4.   How do catalysts affect reaction rate?
    5.   What are biological catalysts?
    6.   Why are reaction rates important?

                                     Stage 2: Assessment Evidence
    Test, quizzes, labs, homework, worksheets (see district curriculum folder).

A             Performance Task Summary                                                 Rubric Titles
G   Quizzes
    Practice problems
E   Labs
    Unit test

2                     Self-Assessments                                     Other Evidence, Summarized
    Self evaluation of "I Can" statements on K&S sheet            "Other assessment information will be obtained through
                                                                  observations, classroom participation, class discussion &
                                                                  interactions, and scaffold learning." The final will be
                                                                  analyzed with Mastery Manager for teachers to improve
                                                                  future instruction.

                                        Stage 3: Learning Activities
    See District Curriculum folder. The following activities are labeled UBD:
S   UBD-Temperature and concentration impact of Rates of Rxn Lab
T   UBD-Factors Affecting Rate Lab
    UBD-Rates of Rxn and Rate Constant Lab
A   UBD-Determine the rate of buret drip Lab


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