methylene iodide

American  

noun

Chemistry.

1. a yellow liquid, CH 2 I 2 , soluble in alcohol and ether: used for the separation of mixtures of minerals and in organic synthesis.

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Example Sentences

Methylene iodide, CH2I2, has a density of 3.33, and may be diluted with benzene.

From Project Gutenberg

In the “diffusion column” method, a liquid column uniformly varying in density from about 3.3 to 1 is prepared by pouring a little methylene iodide into a long test tube and adding five times as much benzene.

From Project Gutenberg

Taken, then, a liquid which is heavy—the most convenient is methylene iodide, whose specific gravity is 3.3—a fragment of zircon will sink in this, and a fragment of tourmaline will float, but a fragment of the mineral augite, whose specific gravity is also 3.3, will remain exactly suspended.

From Project Gutenberg

But methylene iodide further possesses the valuable property of mixing easily with benzene, which is a very light liquid.

From Project Gutenberg

To identify any one of the stones which lie between those limits on the diagram, it is only necessary to drop it into a test tube or small vessel containing methylene iodide—the stone will float—benzene is added drop by drop, the mixture being kept well stirred until a point is reached at which the stone neither sinks nor floats.

From Project Gutenberg