Thin-Layer Chromatography Is a Method That Can Be Used to Separate

question 60

Multiple Choice

Thin-layer chromatography is a method that can be used to separate molecules by their polarity. A mixture of molecules in a nonpolar liquid (the mobile phase) is added to the bottom of a piece of adsorbent material (the stationary phase) and allowed to migrate up the material. More-polar molecules interact more strongly with the stationary phase and thus migrate less. Less-polar molecules interact less strongly with the stationary phase and thus migrate more. Below are sample data for four different molecules from a thin-layer chromatography experiment. [Art: custom PowerPoint figure created by the author]
-Molecule C could possibly contain many of which of the following bonds?

• A) C-C
• B) C-H
• C) O=O
• D) C-O

Calculate and interpret opportunity costs in trade scenarios.

Analyze the impact of trade on national economies and the benefits of specialization.

Evaluate the effects of exchange rate changes on the price of goods and trade.

Comprehend the theory behind international trade and the factors that drive it.

---

Definitions:

Mass

A property reflecting the amount of matter within an object, commonly measured in kilograms or grams.

Atomic Number

A fundamental characteristic of an element, indicating the number of protons in the nucleus of its atoms.

Avogadro's Number

A constant that represents the number of constituent particles, usually atoms or molecules, that are contained in one mole of a substance, approximately \(6.022 \times 10^{23}\).

Carbon-12

A stable isotope of carbon with 6 protons and 6 neutrons, serving as the standard for atomic mass among elements.