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Size of Molecules Experiment

Kit #121

This Lab-Aid allows students to intuitively enter the micro world by determining the size of a molecule. The experiment utilizes the principle that oil and water do not mix. Students isolate a single layer of molecules and learn how the thickness of this monolayer can be calculated when the volume of the substance and the area it covers is known. The computations employed in this kit were originally developed by Dr. Irving Langmuir to deduce the size of a molecule.

Details at a Glance

  • 1 Day | 1 ~50 minute class period
  • 1 Activity
  • Accommodates 1 class, with 12 groups of 4 students
  • Consumables service 50 students
  • Requires a water source

Complete Kit Equipment Package

Size of Molecules Experiment

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Scientific Concepts

• Deduce the order of size of a molecule
• Intuitively step into the micro world
• Utilize math computations

Guides & Student Sheets

Our kits and modules provide you with everything you need so you can open, review, and teach the material confidently the next day.

  • Full downloadable Teacher Guide with background information, detailed instruction, example data and answers
  • Downloadable Student Sheets with age appropriate background information, full procedure(s), and analysis questions
  • All materials necessary to carry out the investigation
  • Safety Data Sheets

Kit Components

  • 1 Teacher’s Guide with MSDS
  • 50 Student Worksheets and Guides
  • 12 Activity plates
  • 12 Metric rulers
  • 1 Bottle of Hydrochloric acid, dilute
  • 1 Bottle of Talcum powder
  • 2 Drop control bottles of Arachidic Acid
  • 2 Drop control bottles of Lauric Acid
  • 2 Drop control bottles of Palmitic Acid
  • 2 Drop control bottles of Sorbic Acid
  • 2 Drop control bottles of Stertic Acid

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