Is there a (single) molecule (natural or synthetic) that is so large, it can be seen by the naked human eye?
All that I can think up off of the top of my mind would be something along the lines of graphite and diamonds, so is there anything that I'm missing?
Please cite sources!
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M$10 Answers
Like crystals, polymers are single molecules, and if they are large enough, they can quite easily be seen with the naked eye. When a polymer is between 0.1 micron and 1 micron in size, you may not be able to distinguish the individual particles, but they will scatter light such that they will be visible.
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M$www.ipse.psu.edu/activities/dna/eye.doc
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M$"A diamond crystal is a single covalently-bonded carbon molecule. The largest one found to date was named the Cullinan, massing 621.2 grams. Cured epoxy resin, crosslinked silicone, cured polyester resin... almost any extensively crosslinked thermoset resin approximates to one big molecule."
I may be reading this wrong, but it seems to indicate that diamond crystals are all single molecules, which would of course make them visible to the naked eye.
It doesn't seem intuitive at all to me and my instincts of course say "no."
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M$en.wikipedia.org/wiki/Cellulose
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M$Perhaps there are polymers like nylon that fit the bill, though I'm just guessing.
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M$Polymers are indeed huge.
But, I wonder whether one molecule of a polymer is visible to naked eye.
I've learned that polymers are the chain of big molecules.
But, Polymers, are the closest answer, I believe.
I guess polymers do fit the bill, never thought of them like that.
I was actually reading my textbook which was going over carbon nanotubes when I thought of the question.
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M$Diamond.
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M$