CMLA Chemistry Basics 4

Question 1

Which separation technique uses differences in solubility and partitioning between a stationary and mobile phase to separate analytes?

Accepted Answer

Chromatography

Answer

Chromatography separates analytes based on their differential affinities for a stationary phase versus a mobile phase.

Question 2

When a chemical reaction reaches equilibrium, which of the following is true?

Accepted Answer

The forward and reverse reaction rates are equal

Answer

At equilibrium, the rate of the forward reaction equals the rate of the reverse reaction, so the concentrations of reactants and products remain constant.

Question 3

A spectrophotometer measures absorbance. According to Beer-Lambert Law, absorbance is directly proportional to:

Accepted Answer

Concentration of the absorbing substance

Answer

Beer-Lambert Law states A = εlc, meaning absorbance is directly proportional to the concentration of the analyte.

Question 4

Which of the following is true about a saturated solution?

Accepted Answer

It contains the maximum amount of dissolved solute at a given temperature

Answer

A saturated solution contains the maximum amount of solute that can dissolve in a solvent at a given temperature and pressure.

Question 5

In the context of laboratory reagents, what does 'hygroscopic' mean?

Accepted Answer

The substance absorbs moisture from the air

Answer

Hygroscopic substances readily absorb and retain water from the surrounding air, which can affect the accuracy of mass-based reagent preparation.

(CMLA) Certified Medical Laboratory Assistant Practice Test

(CMLA) Certified Medical Laboratory Assistant Practice Test

CMLA Chemistry Basics 4