Stiochiometry: Mole Ratios

   Contents

 Task

In this activity, high school chemistry students carry out class experiments in pairs; where they investigate the reaction between Zinc and Hydrochloric acid. From the observations and results, they formulate stoichiometric chemical equations and work out mole ratios for the reacting substances and their products.

 GPS Addressed (click [+] to expand)

    Co-Requisite: Characteristics of Science

    Habits of Mind

    [-] SCSh2.Students will use standard safety practices for all classroom laboratory and field investigations.
      a. Follow correct procedures for use of scientific apparatus.
    b. Demonstrate appropriate techniques in all laboratory situations.
    [-] SCSh3.Students will identify and investigate problems scientifically.
     

    a. Suggest reasonable hypotheses for identified problems.
    b. Develop procedures for solving scientific problems.
    c. Collect, organize and record appropriate data.
    e. Develop reasonable conclusions based on data collected.

    [-] SCSh4.Students will use tools and instruments for observing, measuring, and manipulating scientific equipment and materials.
     

    a. Develop and use systematic procedures for recording and organizing information

    Nature of Science

    [-] SCSh7. Students will analyze how scientific knowledge is developed. Students recognize that:
     

    e. Testing, revising, and occasionally rejecting new and old theories never ends.

    Content

    [-] SC2.Students will relate how the Law of Conservation of Matter is used to determine chemical composition in compounds and chemical reactions.
     

    a. Identify and balance the following types of chemical equations:

    • Synthesis
    • Decomposition
    • Single Replacement
    • Double Replacement
    • Combustion

    b. Experimentally determine indicators of a chemical reaction specifically precipitation,             gas evolution, water production, and changes in energy to the system.
    d. Identify and solve different types of stoichiometry problems, specifically relating             mass to moles and mass to mass.

    [-] SC3.Students will use the modern atomic theory to explain the characteristics of atoms.
     

    e. Compare and contrast types of chemical bonds (i.e. ionic, covalent).


 Video (duration: 14:00)

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Use these questions to guide your thinking about some of the important teacher ideas in the lesson featured in the video clip.

 

 

  1. How does Ms. Holt engage the students in the problem?
  2. What features of scientific inquiry are present in this particular classroom activity?
  3. Consider how Ms. Holt promotet standard safety practices.

 Classroom Materials / Lesson Outlines