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Moving Molecules!

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    Twin Cities Public Television

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Moving Molecules!

In this activity about molecular diffusion (located on page 2 of the PDF under Nanosilver Activity), learners will make predictions and move molecules of iodine through a seemingly solid plastic sandwich bag. The process of diffusion will be visually indicated by a color change when the iodine reacts with starch inside the bag. Information in the resource explains how this activity relates to nanoparticles and research. Related to linked video, DragonflyTV Nano: Nanosilver.

Quick Guide

Preparation Time:
Under 5 minutes

Learning Time:
10 to 30 minutes

Estimated Materials Cost:
$1 - $5 per group of students

Age Range:
Ages 8 - 14

Resource Types:
Activity, Experiment/Lab Activity, Lesson/Lesson Plan


Materials List (per group of students)

  • iodine (from drugstore)
  • cheap plastic sandwich bag
  • cornstarch
  • water
  • small bowl


  • Engineering and Technology
    • Engineering
      • Nanotechnology
  • Life Sciences
    • Cells
      • Cell Structure and Function
  • Mathematics
    • Measurement
      • Size and Scale
  • Physical Sciences
    • Chemistry
      • Chemical Reactions
      • Acids and Bases
      • Oxidation-Reduction Reactions
      • Chemistry of Life
    • States of Matter
      • Liquids
    • Structure and Properties of Matter
      • Atomic Structure
      • Elements and Periodic Table
  • The Nature of Science
    • Science and Society
      • Risks and Benefits
    • The Scientific Process
      • About Inquiry
      • Asking Questions
      • Conducting Investigations
      • Formulating Explanations
      • Communicating Results
  • The Nature of Technology
    • Technology and Society
      • Impacts of Technology
      • Technology and the Environment


To use this activity, learners need to:

  • see
  • see color
  • touch

Learning styles supported:

  • Involves hands-on or lab activities


Components that are part of this resource:

Includes alignment to state and/or national standards

This resource is part of:

Access Rights:

  • Free access


Source Collection:

  • DragonflyTV


  • All Rights Reserved, Twin Cities Public Television, Inc., ©2008

Funding Source:

  • National Science Foundation, 741749


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