Exam 4: Separating Complex Mixtures

The goal of chromatography is baseline resolution.

In order to effectively dissolve a solute in a solvent, both should be either polar or non-polar.

A solution with a pH of 5 is alkaline or base.

The peak in a chromatogram is an oval shaped diagram.

A solution with a pH of 13 is acidic.

Forensic Science labs rarely use mass spectrometry as a detector for gas chromatography.

Gas chromatography can separate amounts of solids or liquids as small as a few nanograms.

Gas Chromatography is used for the separation of large amounts of solids or liquids.

The procedure called liquid-liquid extraction is used to separate one solid material from another when at least two grams of material are present.

Polar substances that have actual, identifiable positive and negative ions are known as ionic substances.

Electrophoresis is used to resolve problems in separation of substances that are very similar in nature when chromatography cannot be used.

Gasoline and water dissolve readily in each other.

The p in pH stands for the positive logarithm of the concentration in moles per liter

Mass action refers to heavier molecules traveling slower through the column in chromatography than lighter molecules.

Chemicals only have either negative or positive polarity.

The two phases of chromatography are

The process used to describe the travel of the mobile phase through the stationary phase of TLC is known as:

Gasoline contains over ___________ separate substances.

When a researcher has very little material (< 1 grams)to work with in identifying a substance, the most effective method to use to identify the substance is:

The pH of pure water is 12.