Thin Layer Chromatography (AQA A-Level Chemistry): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
What materials are used as the stationary phase in TLC?
What materials are used as the stationary phase in TLC?
Alumina or silica gel
What type of substance is used as the mobile phase in TLC?
What type of substance is used as the mobile phase in TLC?
An organic solvent
How does the solvent move up the TLC plate?
How does the solvent move up the TLC plate?
By capillary action
What happens to molecules with stronger attraction to the mobile phase?
What happens to molecules with stronger attraction to the mobile phase?
They travel more quickly up the plate
What happens to molecules with stronger attraction to the stationary phase?
What happens to molecules with stronger attraction to the stationary phase?
They move more slowly up the plate
What is the formula for calculating the value?
What is the formula for calculating the value?
= distance moved by spot / distance moved by solvent
Where must the origin be positioned when placing the plate in solvent?
Where must the origin be positioned when placing the plate in solvent?
Above the solvent's surface
What is the solvent front?
What is the solvent front?
The top point where solvent reaches
How can some spots on chromatograms be made visible?
How can some spots on chromatograms be made visible?
Under UV light
What is used to develop spots of aromatic compounds on chromatograms?
What is used to develop spots of aromatic compounds on chromatograms?
A solution of iodine