Question 1
Which observation from a thin layer chromatography (TLC) experiment would indicate that a substance is impure?
Worked answer
🔒 Start free to see full answer
Chemistry · Unit 2 · Intermolecular forces and gases · Intermolecular forces
Identify that paper and thin layer chromatography can be used to determine the composition and purity of substances.
Practise this objective
AI-marked practice questions tied to QCAA mark schemes for this exact LO. Free to start.
Start free practicePractice questions for this objective
Full questions, answers and worked solutions unlock when you start a free practice session.
Question 2
A chemist performs thin layer chromatography (TLC) on a sample of food colouring to determine its composition. The developed TLC plate shows three distinct spots with different Rf values. Identify what the chromatogram indicates about the composition of the food colouring sample, and state one reason why TLC is a suitable technique for this analysis.
Worked answer
🔒 Start free to see full answer
Question 3
A student obtains a sample of liquid sweetener and performs thin layer chromatography (TLC) to determine whether it contains multiple dyes. The TLC plate is developed using an appropriate solvent system and examined under ultraviolet (UV) light. Two spots are observed at different positions on the plate. Which statement correctly explains what this result indicates?
Worked answer
🔒 Start free to see full answer
More in Intermolecular forces
← Previous
Explain the relationship between vapour pressure, melting point, boiling point and solubility, and the nature and strength of intermolecular forces (e.g. dispersion forces, dipole-dipole attractions, and hydrogen bonding) within molecular covalent substances. Chromatography techniques
Next →
Identify that the kinetic theory of gases applies to ideal gases.