Scan_Doc0034 - 28 Chapter One Chemical Foundations Figure...

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Unformatted text preview: 28 Chapter One Chemical Foundations Figure 1 .1 3 Paper chromatography of ink. (a) A dot of the mixture to be separated is placed at one end of a sheet of porous paper. (b) The paper acts as a wick to draw up the liquid. ~ ~ , \ . . - I "- " ' - - / • ~, The element mercury (top left) combines with the element iodine (top right) to form the compound mercuric iodide (bottom). This is an example of a chemical change. Ioiijp. (a) (b) A third method of separation is called chromatography. Chromatography is the gen- eral name applied to a series of methods that employ a system with two phases (states) of matter: a mobile phase and a stationary phase. The stationary phase is a solid, and the mobile phase is either a liquid or a gas. The separation process occurs because the com- ponents of the mixture have different affinities for the two phases and thus move through the system at different rates. A component with a high affinity for the mobile phase moves relatively quickly through the chromatographic...
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