why is iodine used to test for starch
Iodine test The iodine test is used to test for the presence of starch. Starch turns an intense "blue-black" colour upon addition of aqueous solutions of the triiodide anion, due to the formation of an intermolecular charge-transfer complex. In the absence of starch, the brown colour of the aqueous solution remains. This interaction between starch and triiodide is also the basis for iodometry.
Emulsion test Add ethanol to the solution you want to test, and add water. A colour change to cloudy white shows that lipids are present.
Vapor–liquid separator For the common variety, gravity is utilized in a vertical vessel to cause the liquid to settle to the bottom of the vessel, where it is withdrawn.[1][2][3][4]
Dividend yield Its reciprocal is the Price/Dividend ratio.