A Classical Gas A Classical Gas Diffusion Model

1
A Classical GasA Classical Gas Diffusion
Model

• By Eleanor Zuberek and Jack Walsh at
• Lynn Classical High School
• Zubereke_at_lynnschools.org
• Walshj_at_lynnschools.org

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Objectives

• Students will demonstrate comprehension and
  application of Grahams law of diffusion and
  effusion.
• They will do this by describing the movement of
  gases.
• The will be able to use SMD and graph parameters.

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Movement of Gases

• A class Lesson within the unit on gas laws.
• Grahams Law Gas Movement Calculations
• Traditional Wet lab Activity
• Simulated activity
• Student Assessment Rubric

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Intended Audience

• Chemistry I and Honors Chemistry students
• Our students are from a wide variety of
  backgrounds including 30-40 that have immigrated
  from non-English speaking countries
• We would like to help students conceptualize
  movement of atoms and molecules as never before
  possible in an ordinary classroom.
• We hope to help students to excel in particle
  movement theory as it relates to Massachusetts
  Chemistry Frameworks.
• We hope to enhance current teaching methods.

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Adjustment/Adaptation

• We believe that our unit has many strengths. The
  wet lab has the advantage of being very
  inexpensive to run.
• We are happy that we are one of the fortunate
  schools that has good computer access. In another
  situation, however, the simulated labs could be
  run from a presentation station with only one
  computer.
• We believe that it could even be run from a Play
  Station.

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Placement in Curriculum

• This topic is to be covered with the other gas
  laws. It follows and reinforces the material
  dealing with states of matter and phase changes.
• It also provides a nice place for them to
  practice their dimensional analysis skills.

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Time

• We are allotting one day for the initial lesson
  and one for problem solving. We will follow this
  with the wet lab and more problem solving with
  their laboratory data, hopefully to be completed
  within our double period.
• Using the simulabs we plan to reinforce not only
  the Grahams Law but the other gas law as well.
  We plan 1-2 days for this.
• This topic should be covered in approximately
  four days.

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Resources

• For the wet lab you need a traditional chemistry
  laboratory and, per lab group(2-4 students) 
• Equipment 3 glass tubes
• 2 10 mL beakers
• meter sticks
•   Materials NH3 (ammonia)
• HCl 12M (hydrochloric acid)
• cotton swabs ( Q tips )
• acetone
• Set up time 10-15 min
• For the simulab you need
• PC lab (-2 students per computer) and VMDL
  software, Sony Play Station
• Set up time To be determined

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Assessments

• There will be a lab report with specific
  instructions dealing with the wet lab.
• There is a quiz to follow the end the end of the
  unit that encompasses the material covered in the
  lecture, labs and SMD exercises.
• See these items and more in attached word
  documents.