Back to AI Flashcard MakerChemistry /OCR A-Level Chemistry: Chapter 29 - Chromatography and Spectroscopy

OCR A-Level Chemistry: Chapter 29 - Chromatography and Spectroscopy

Chemistry15 CardsCreated 2 months ago

This flashcard set covers the fundamental concepts of chromatography, focusing on its two main phases—stationary and mobile—as well as the materials used in Thin Layer Chromatography (TLC), such as the TLC plate. It provides quick definitions and distinctions between components.

What are the two phases for all forms of chromatography?

Stationary phase

Mobile phase

Tap or swipe ↕ to flip
Swipe ←→Navigate
1/15

Key Terms

Term
Definition

What are the two phases for all forms of chromatography?

Stationary phase

Mobile phase

What is the stationary phase?


Does not move

A solid or a liquid supported on a solid

What is the mobile phase?

Does move

Normally a liquid or a gas

What is a TLC plate made of?

Plastic/glass sheet

Coated with thin layer of a solid adsorbent substance such as silic...

Outline adsorption in reference to TLC

Process by which the solid silica holds the different substances in the mixture to its surface

How is the retention factor calculated?

Distance moved by the component/distance moved by the solvent front

Related Flashcard Decks

Study Tips

  • Press F to enter focus mode for distraction-free studying
  • Review cards regularly to improve retention
  • Try to recall the answer before flipping the card
  • Share this deck with friends to study together
TermDefinition

What are the two phases for all forms of chromatography?

Stationary phase

Mobile phase

What is the stationary phase?


Does not move

A solid or a liquid supported on a solid

What is the mobile phase?

Does move

Normally a liquid or a gas

What is a TLC plate made of?

Plastic/glass sheet

Coated with thin layer of a solid adsorbent substance such as silica

Outline adsorption in reference to TLC

Process by which the solid silica holds the different substances in the mixture to its surface

How is the retention factor calculated?

Distance moved by the component/distance moved by the solvent front

What is gas chromatography useful for?

Separating and identifying volatile organic compounds present in a mixture


What are the different phases for gas chromatography?

Stationary - high boiling liquid adsorbed onto an inert solid support
Mobile - inert carrier gas such as helium

How does time taken to move through the column change as solubility in stationary phase increases?

Moves slower

Time taken increases

What is retention time?

Time taken for a component to travel through the column

How is retention time used for identification?


Compare to retention times in database

What can peak integrations for gas chromatograph be used to determine?

Concentrations of components in the sample

What is resonance for NMR?

When the nucleus absorbs energy and rapidly flips between the two spin states

What is the standard reference chemical for NMR?


Tetramethylsilane (TMS)

(CH3)4Si

What is the purpose of D2O as a solvent in proton NMR spectroscopy?

O-H peaks no longer appear