Analytical Chemistry

What is Chromatography used for?

• Separating mixtures of substances into their components

• Identifying the charge of a compound

• Calculating the enthalpy change

• Identifying the Molecular Mass of a substance

chromatography separates the mixture of dyes on the basis of their ----------------------------

• Density

• Solubility

• Gravity

• Boiling Point

On the chromatogram given -------------- is mixture.

• Red

• Orange

• Green

• Black

A high R_f value indicates __________

• strong affinity to the stationary phase

• strong affinity to the mobile phase

• no affinity to the stationary phase

• no affinity to the stationary phase

In TLC substances are separated because of differences in_______. Tick all that apply.

• Polarity

• Molecular Size

• Concentration

• Electronegativity

How to calculate Rf?

• Rf = distance traveled by sample / distance traveled by solvent

• Rf = distance traveled by solvent / distance traveled by sample

HPLC stands for

• High Performance Layer Chromatography

• High Performance Liquid Chromatography

• Highly Placed Liquid Chromatography

• Hard Performance Liquid Chromatography

High pressure liquid chromatography can be performed only in columns.

• True

• False

Which form of chromatography does NOT utilize the mobile phase?

• Paper

• TLC

• HPLC

• Gas

What do the peaks on the mass spectrum represent?

• anions

• different isotopes

• atoms with differing numbers of electrons

• numbers of electrons