In the Thin Layer Chromatography Procedure for Drug Screening,the Retention

question 11

Multiple Choice

In the thin layer chromatography procedure for drug screening,the retention factor (R_f) value for a compound is given by the:

• A) ratio of distance moved by the unknown solute to distance moved by the solvent in the mobile phase.
• B) rate of movement of the mobile phase through the adsorbent compared with standards and controls.
• C) measurement in centimeters of the distance the solute moved in the mobile phase from the point of application.
• D) distance moved by the mobile phase front from the point of application compared with a control.

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Definitions:

Straight-Line Method

A depreciation method that allocates an equal amount of the cost of an asset to each year of its useful life.

Effective Interest Method

An accounting technique used to allocate the interest expense or income over the life of a financial instrument, reflecting the changing amount of outstanding principal over time.

Present Value

Today's value of a future sum of money or sequence of cash flows, calculated based on an agreed-upon rate of return.

Annual Rate

The interest rate for a period of one year, often used to compare the return on investments or the interest cost on loans.