Chromatography and Functional Group Analysis (OCR A-Level Chemistry A): Quizzes
📚Quizzes
Practise the questions
10 questions from this quiz
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Practise the questions
10 questions from this quiz
What is the role of the mobile phase in chromatography?
What is the role of the mobile phase in chromatography?
Carries mixture components through system
Which material is most commonly used as the adsorbent in thin layer chromatography?
Which material is most commonly used as the adsorbent in thin layer chromatography?
Silica
Why must the solvent level be below the sample spot at the start of TLC?
Why must the solvent level be below the sample spot at the start of TLC?
To prevent sample dissolving in solvent
What are the characteristics of an value?
What are the characteristics of an value?
Always between 0 and 1 with no units
In GC, which component has the shortest retention time?
In GC, which component has the shortest retention time?
Least soluble in stationary phase
What does the area under a peak in a gas chromatogram indicate?
What does the area under a peak in a gas chromatogram indicate?
Concentration of the component
What is the positive result when testing for alkenes with bromine water?
What is the positive result when testing for alkenes with bromine water?
Orange colour is decolourised
Which reagent distinguishes aldehydes from ketones?
Which reagent distinguishes aldehydes from ketones?
Tollens' reagent
What observation confirms the presence of a carboxylic acid?
What observation confirms the presence of a carboxylic acid?
Effervescence with sodium carbonate
How can phenols be distinguished from alkenes using bromine?
How can phenols be distinguished from alkenes using bromine?
Phenols form white ppt; alkenes don't