chromatography

The physical separation of mixtures into individual components is..

• chromatography
• opacity 
• latent
• trace evidence 

Ink can be separated by a method of -----------------------------------------------

• distillation

• filtration

• chromatography

• sedimentation

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

• red
• orange
• green
• black

The diagram below shows a chromatogram obtained when a sample X was analysed together with four other known dyes P, Q, R and S. Dye Q was known to cause cancer. Which of the following dye(s) is/are safe for use?

• P only
• S only
• P and S
• P and X

_________________ utilizes a stationary and a mobile phase to separate mixtures based on their affinity for each phase.

• filtration
• chromatography
• distillation
• osmosis

The substance in the mixture that has the greatest affinity for the mobile phase will travel

• fastest
• slowest

The substance in the mixture that has the greatest affinity for the stationary phase will travel

• fastest
• slowest

The retention factor is used

• to zero the chromatography scale
• to identify unknown compounds in a sample
• to retain solvent
• as a starting tool for chromatography

A qualitative test will reveal....

• identity of a material
• amount of a sample
• usefulness of a compound
• purity of a substance

Which process will NOT yield a positive identity of a substance?

• Electrophoresis
• TLC
• Infrared Spec
• GC with MS