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

---

Definitions:

Unearned Fees

Income received by a business for services yet to be performed or delivered, recorded as a liability on the balance sheet until the services are completed.

Earned Fees

Revenue generated from providing services or performing work.

Adjusting Entry

A journal entry made in accounting records to update the balances of accounts at the end of an accounting period.

Accrued Salaries

Salaries that have been earned by employees but have not yet been paid by the employer.