Test on Chromatography: Principles and Applications
Chromatography: Principles and Applications for Students
Test: Chromatography
20 questions
Question 1: Ultraviolet light can make colourless substances glow, making them visible for analysis in chromatography.
A. Ano
B. Ne
Explanation: The study materials state: 'Alternatively, ultraviolet light might make the substances glow. This makes the substances visible so the chromatogram can be analysed.'
Question 2: Paper chromatography is the most common method used for water analysis to determine if drinking water is safe.
A. Ano
B. Ne
Explanation: The study materials state that chromatography is used in water analysis and photo A shows a machine doing chromatography for water analysis. Question 8c asks to suggest why the method in photo A (machine chromatography) is used to analyse water rather than paper chromatography, implying paper chromatography is not the primary method for this application, especially for drinking water safety. The text also mentions that "Chromatography is often done by complicated machines" and displays results of "water analysis" as a graph with peaks, characteristic of machine chromatography, not paper.
Question 3: In chromatography, substances in a mixture separate because they are carried by the solvent at the same speed.
A. Ano
B. Ne
Explanation: Chromatography separates substances because different substances in a mixture are carried by the solvent at different speeds, not the same speed.
Question 4: Chromatography can be used in the forensic analysis of crime scenes to identify specific mixtures, such as colours in a lipstick or in a black ink.
A. Ano
B. Ne
Explanation: The study materials state that chromatography is used in the forensic analysis of crime scenes to identify specific mixtures, giving examples like colours in a lipstick or in a black ink.
Question 5: In the basic process of chromatography, substances in a mixture are exclusively carried by a gas solvent.
A. Ano
B. Ne
Explanation: The study materials state that in the basic process of chromatography, substances in a mixture are carried by a gas 'or' liquid solvent, indicating that both types of solvents can be used, not exclusively gas.