Material Science (C) Trial Event

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Material Science (C)Trial Event

• By
• Linda (Lin) Wozniewski
• lwoz_at_iun.edu

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Safety

• Students must wear
• Closed shoes
• Slacks or skirts that come to the ankles
• Lab coat or lab apron
• Indirect vent or unvented chemical splash proof
  goggles. No impact glasses or visorgogs are
  permitted
• Sleeved Shirt (if wearing a lab apron)

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What Students May Bring

• Calculator
• 1 sheet of paper on which anything is acceptable
• A writing instrument

4
What Supervisors Will Supply

• Everything the student will need
• This may include
• Glassware
• Reagents
• Balances
• Hot plates
• Thermometers
• Probes
• Magnets
• Stirrers
• Models
• Toothpicks and marshmellows

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Main Focus

• Surface Tension/Contact Angle 50
• Solid State Chemistry 50
• How to prepare Students
• Experiment ideas
• Resources

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Surface Tension/Contact Angle

• Hydrogen bonding
• Measurement of contact angle
• Ranking of hydrophobicity of unknowns

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Solid State Chemistry

• Model different Crystal Packing Arrangements
• Miller Indices
• Identify types of packing

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How to Prepare Students

• Students should research contact angles
• Students should research Miller Indices
• Students should be familiar with types of crystal
  packing
• Students should research hydrophobic and
  hydrophilic chemicals and how to tell the
  difference
• Students should research surface tension

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Experiments

• Given the picture of a droplet, a protractor and
  a ruler, the students should be able to measure
  the contact angle
• Given a series of reagents students should be
  able to arrange the reagents from least to most
  hydrophobic based on the contact angle
• Given a pan of water covered in chalk dust, the
  students should be able to measure the
  approximate thickness of a detergent molecule

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Experiments Continued

• Given a type of crystal packing structure, some
  toothpicks and marshmallows, the students should
  be able to model common crystal packing
  structures
• Given models of crystal packing structures,
  students should be able to name the type of
  packing
• Given a picture or model and a Miller index,
  students should be able to determine which atoms
  are being cut across.

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Resources

• For Event Supervisors
• http//mypage.iu.edu/lwoz/socrime/index.htm
• For Lesson Plans for classroom use
• http//mypage.iu.edu/lwoz/socrime/index.htm