Chromatography Exam-Style Questions
Question 1
Q1. Knowledge Recall (1 mark)
Define chromatography and state its purpose.
Question 2
Q2. Application (2 marks)
Explain how paper chromatography can be used to identify food colorings in a drink.
Question 3
Q3. Calculations (2 marks)
Calculate the Rf value of a compound that moves 5 cm from the origin and the solvent front moves 10 cm.
Question 4
Q4. Chemical Equation (1 mark)
Write the chemical equation for the reaction that occurs when magnesium oxide is dissolved in water.
Question 5
Q5. Knowledge Recall (2 marks)
State two applications of chromatography in industry.
Question 6
Q6. Application (3 marks)
Describe how thin-layer chromatography (TLC) can be used to separate and identify different plant pigments.
Question 7
Q7. Calculations (3 marks)
A compound has an Rf value of 0.75 in one solvent and 0.85 in another solvent. Calculate the ratio of the distribution constant of the compound between the two solvents.
Question 8
Q8. Chemical Equation (2 marks)
Write the equation for the reaction that takes place when concentrated sulfuric acid is added to sugar.
Question 9
Q9. Knowledge Recall (1 mark)
Describe the role of a stationary phase in chromatography.
Question 10
Q10. Application (3 marks)
Explain how gel electrophoresis can be used to separate DNA fragments.