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Experimental Chemistry and Separation Techniques
Quick questions on Paper chromatography explained: O-Level Chemistry
5short Q&A pairs drawn directly from our worked dot-point answer. For full context and worked exam questions, read the parent dot-point page.
What is reading a chromatogram?Show answer
A finished chromatogram tells you two things directly:
What are locating colourless substances?Show answer
If the substances are colourless (such as amino acids or sugars), the separated spots are invisible. They are revealed by spraying the paper with a locating agent that reacts to give a colour, or by viewing under ultraviolet light if the spots fluoresce.
What is q1?Show answer
A mixture produces four spots on a chromatogram. State how many substances it contains. [1 mark]
What is q2?Show answer
A spot moves while the solvent front moves . Calculate its value. [2 marks]
What is q3?Show answer
Explain why the start line on a chromatogram is drawn in pencil and not in ink. [2 marks]
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