Chromatography Practice

What is an example of a substance that could be tested using TLC in forensic science?

• broken wood bits

• inks and dyes

• hair analysis

What is an example of a substance that could be tested using TLC in forensic science?

• broken glass shards

• drug remnants

• fingerprint analysis

Chromatography is one physical method used to separate and analyze ___________________ mixtures. For example, a drug containing various elements or traces of ("laced" with) other drugs can be further examined, analyzed, compared, etc. and the different components within the substance can be detected.

• simple

• complex

• viscous

• metals

When used along with other tests or even alone with known samples for comparison, a chromatography test can be considered a _______________ test.

• presumptive

• confirmatory

• basic

• false positive

In Thin Layer Chromatography (TLC), the stationary phase refers to:

• paper

• solvent

• solvent front

• lid

In Thin Layer Chromatography (TLC), the mobile phase refers to:

• paper

• solvent

• gravity

• lid

Calculate the Rf factor of the blue dot.

• 8 cm

• 0.8 cm

• 1.25 cm

• 2 cm

Chromatography cannot be used to separate delicate products.

• True

• False

In Thin Layer Chromatography, the stationary phase is made of ___________ and the mobile phase is made of __________.

• solid; liquid

• liquid; liquid

• liquid; gas

• solid; gas

Capillary action is the phenomena that allows the solvent to move up the chromatography paper strip against the force of gravity. This term refers to the ________________.

• adhesive properties of the solvent, allowing it to stick to the paper and travel through its small pores.

• light weight of the particles in the solute, allowing them to float up towards the top of the paper

• break in the pull of gravity due to the thick glass container

• none of the above