Determining atomic radius at home

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SUMMARY

The forum discussion centers on a method for determining the atomic radius of a carbon atom using an oil droplet experiment. The procedure involves transferring a droplet of oil onto water, allowing it to spread into a monolayer, and measuring the radius of the resulting circular oil patch. By applying the formula for volume (volume = length × area of cross-section), participants can estimate the size of individual carbon atoms, particularly when considering a chain of 12 carbon atoms. The discussion highlights the need for precise measurements and calculations to achieve accurate results.

PREREQUISITES
  • Understanding of basic physics principles, particularly surface tension and molecular structure.
  • Familiarity with volume calculations and geometric formulas.
  • Knowledge of carbon atom structure and molecular chains.
  • Experience with experimental measurement techniques.
NEXT STEPS
  • Research the principles of surface tension and its effects on droplet formation.
  • Learn about the geometric properties of cylinders and their volume calculations.
  • Explore molecular modeling software to visualize carbon atom arrangements.
  • Investigate similar experiments, such as the Langmuir-Blodgett technique for monolayer formation.
USEFUL FOR

This discussion is beneficial for physics students, chemistry enthusiasts, and educators looking to replicate or understand experimental methods for determining atomic sizes and molecular structures.

p.tryon
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I recall a physics teacher demonstrating an experiment where he transferred a droplet of oil to the surface of water and carried out some calculations to determine the radius of a carbon atom. I was hoping to replicate the experiement- However I forget the details.

Has anyone seen this experiement and could explain the details? And/or direct me to a useful website?

Thanks
Pete
 
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The experiment used an oil drop of known volume that was assumed to spread itself out on the surface of the water such that it formed a layer one molecule thick.
Measuring the radius of this (circular) oil patch, and assuming it is in the form of a cylinder, gives the "length" of that cylinder, and an estimate of the molecular size. (FRom volume = length times area of cross section)
If the molecule consists of, say, a chain of 12 carbon atoms, you can estimate the size of one atom.
 
Thanks. I have tried it but no luck so far... :-)
 

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