Required Practical: Investigating Chromatography (AQA GCSE Chemistry): Quizzes
📚Quizzes
Practise the questions
12 questions from this quiz
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Practise the questions
12 questions from this quiz
What is paper chromatography used for?
What is paper chromatography used for?
To separate and identify coloured chemicals
How far from the short edge should the pencil line be drawn?
How far from the short edge should the pencil line be drawn?
2 cm
Why must you use a pencil (not ink) to draw the line?
Why must you use a pencil (not ink) to draw the line?
Ink would dissolve in the solvent
How deep should the solvent be in the beaker?
How deep should the solvent be in the beaker?
About 1 cm deep
Where should the ink spot be positioned when placing the paper in the beaker?
Where should the ink spot be positioned when placing the paper in the beaker?
Just above the solvent surface
What should you use to cover the beaker during the experiment?
What should you use to cover the beaker during the experiment?
A watch glass
When should you remove the paper from the beaker?
When should you remove the paper from the beaker?
When solvent is 1 cm from the top
What should you mark with pencil after removing the paper?
What should you mark with pencil after removing the paper?
Solvent front and ink spots
When measuring how far an ink spot moved, where should you measure from?
When measuring how far an ink spot moved, where should you measure from?
The centre of each spot
What is the formula for calculating the Rf value?
What is the formula for calculating the Rf value?
What does the Rf value help you do?
What does the Rf value help you do?
Identify different chemicals in the ink
What does the Rf value show about each chemical?
What does the Rf value show about each chemical?
How far it moved vs the solvent