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Chemical Reactions

Unit Plan

Chemical Reactions

Objectives

In this unit, students will analyze common chemical reactions. Students will use their knowledge of moles, ionic compounds, and nomenclature to investigate topics such as predicting products, the law of conservation of matter, and stoichiometry. Students will:

  • classify chemical reactions as decomposition, synthesis, combustion, single replacement, or double replacement.

  • predict the products of simple chemical reactions.

  • balance chemical equations by applying the law of conservation of matter.

Essential Questions

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Formative Assessment

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    Multiple Choice Items:

    1. Which is a single-replacement reaction?

    A

    CaI2 + 2K Ca + 2KI

    B

    NaNO3 + KI NaI + KNO3

    C

    2Mg + O2 2MgO

    D

    2C2H6 + 7O2 4CO2 + 6H2O

    2. Which equation is balanced correctly?

    A

    NaCl + F NaF + Cl

    B

    NaCl2 + F2 NaF2 + Cl2

    C

    2NaCl + F2 NaF + Cl2

    D

    2NaCl + F2 2NaF + Cl2

    3. Which are products of a combustion reaction?

    A

    CO and H2O

    B

    O2 and H2O

    C

    CO2 and H2O

    D

    Hydrocarbons and H2O

    4. Which element is diatomic?

    A

    Phosphorus

    B

    Silicon

    C

    Iodine

    D

    Carbon

    5. What are the products of the reaction shown below?

    AgNO3 + NaCl ?

    A

    AgNO3 and NaCl

    B

    AgNa and NO3Cl

    C

    Ag and Cl

    D

    AgCl and NaNO3

    6. What are the products of the reaction shown below?

    2CO ?

    A

    C + O2

    B

    2C + O2

    C

    C + O2

    D

    2C + 2O2

    7. Energy is always a product of which reaction type?

    A

    synthesis

    B

    combustion

    C

    single replacement

    D

    double replacement

    Use the diagram below to answer question 8.

    08a.PNG

    8. Which metal is the most reactive?

    A

    K

    B

    Na

    C

    Au

    D

    Al

    9. What type of reaction is shown below?

    4Fe + 3O2 2Fe2O3

    A

    double replacement

    B

    single replacement

    C

    decomposition

    D

    synthesis

    Multiple Choice Answer Key:

    1. A

    2. D

    3. C

    4. C

    5. D

    6. B

    7. B

    8. A

    9. D

    Short-Answer Items:

    10. Balance the following equation. Show the atom inventories for the reactants and products. Also, indicate which type of reaction it represents.

    C3H8 + O2 CO2 + H2O











    11. Determine and list all that is wrong with the following chemical equation and indicate which type of reaction it represents.

    F + ZnI2 ZnF + I


    Short-Answer Key and Scoring Rubrics:

    10. Balance the following equation. Show the atom inventories for the reactants and products. Also, indicate which type of reaction it represents.

    C3H8 + O2 CO2 + H2O

    Students should create two atom inventories for the reactants and products, before and after they balance the equation. The balance equation should look like this:

    C3H8 + 5O2 3CO2 + 4H2O

    Atom Inventory Before Balancing:

    Reactants

    Products

    C = 3

    C = 1

    H = 8

    H = 3

    O = 2

    O = 2

    Atom Inventory After Balancing:

    Reactants

    Products

    C = 3

    C = 3

    H = 8

    H = 8

    O = 10

    O = 10

    Points

    Description

    2

      Student completes all three of the following:

    • Student correctly balances the equation.

    • Student correctly creates atom inventories before and after balancing the equation.

    • Student identifies the reaction as a combustion reaction.

    1

      Student completes two of the following:

    • Student correctly balances the equation.

    • Student correctly creates atom inventories before and after balancing the equation.

    • Student identifies the reaction as a combustion reaction.

    0

      Student completes one or none of the following:

    • Student correctly balances the equation.

    • Student correctly creates atom inventories before and after balancing the equation.

    • Student identifies the reaction as a combustion reaction.

    11. Determine and list all that is wrong with the following chemical equation and indicate which type of reaction it represents.

    F + ZnI2 ZnF + I

    Points

    Description

    2

    • Student recognizes that fluorine on the reactant side is diatomic and should be written as F2.

    • Student recognizes that iodine on the product side is diatomic and should be written as I2.

    • Student recognizes that zinc fluoride on the product side should be written as ZnF2.

    • Student recognizes that there are no added coefficients.

    1

      Student recognizes two to three of the following four mistakes in the equation:

    • Fluorine on the reactant side is diatomic and should be written as F2.

    • Iodine on the product side is diatomic and should be written as I2.

    • Zinc fluoride on the product side should be written as ZnF2.

    • There are no added coefficients.

    0

      Student does not recognize any of the four mistakes in the equation.

    Performance Assessment:

    Materials:

    • mossy zinc

    • MnO2

    • 3% H2O2

    • 6 M HCl

    • 3 M H2SO4

    • 1 M Na2CO3

    • 1 M CaCl2

    • 1 M Ba(OH)2

    • magnesium ribbon

    • methanol

    • extra large heavy plastic bottle (such as a large water cooler bottle)

    • matches

    • tongs

    • 3 test tubes

    • balloon

    • copies of Performance Lab worksheet (S-C-3_Performance Lab.doc and
      S-C-3_Performance Lab KEY.doc)

    Advance Preparation: Practice all of the demonstrations for the performance assessment before conducting them in class.

    Safety Precautions: Handle all chemicals and other materials using standard safety precautions. Wear safety goggles and gloves during all demonstrations. Keep students at a safe distance from the demonstrations.

    Use the Performance Lab to assess student learning (S-C-3_Performance Lab.doc and
    S-C-3_Performance Lab KEY.doc).

    Performance Assessment Scoring Rubric:

    Points

    Description

    5

      For all five reactions, the student correctly identifies the reaction type and writes the correct products, reactants, and balanced equation.

    4

    For four reactions, the student correctly identifies the reaction type and writes the correct products, reactants, and balanced equation.

    3

    For three reactions, the student correctly identifies the reaction type and writes the correct products, reactants, and balanced equation.

    2

    For two reactions, the student correctly identifies the reaction type and writes the correct products, reactants, and balanced equation.

    1

    For one reaction, the student correctly identifies the reaction type and writes the correct products, reactants, and balanced equation.

    0

    The student demonstrates lack of understanding or does not attempt to complete the assessment.

DRAFT 11/19/2010
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