Examlex
Multiple chemical components of a mixture are separated via thin-layer chromatography using silica gel as the stationary phase and ethanol and acetic acid as the mobile phase. What does the distance travelled by each component tell the analyst about their chemical identity?
Mining
The extraction of valuable minerals or other geological materials from the earth.
Railroad Industries
A sector centered around the development, maintenance, and operation of railways, which played a critical role in economic growth and the expansion of trade and transport in the 19th and early 20th centuries.
American Workforce
The labor pool in the United States, consisting of all individuals actively engaged in employment or seeking employment.
Worked For Wages
The concept or state of laboring in exchange for monetary compensation.
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