GCSE Chemistry - Paper Chromatography #63

The video tutorial explains chromatography, focusing on paper chromatography used to separate dyes in ink. It details the process, including setting up the experiment with filter paper and solvent, and observing how different dyes travel at different rates. The concepts of mobile and stationary phases are introduced, explaining how they affect the movement of substances. The tutorial also covers calculating RF values to identify chemicals, noting that results vary with different solvents or paper types.

What is the primary purpose of chromatography?

• To separate and identify substances in a mixture

• To mix different substances

• To increase the volume of a mixture

• To change the color of substances

What is the first step in setting up a paper chromatography experiment?

• Adding solvent to the beaker

• Drawing a baseline on the filter paper

• Placing the paper in the solvent

• Adding a lid to the beaker

Why is it important not to submerge the pencil line and ink spot in the solvent?

• To keep the solvent from evaporating

• To ensure the ink spot moves with the solvent

• To prevent the paper from dissolving

• To make the paper more colorful

What is the mobile phase in paper chromatography?

• The solvent used

• The baseline

• The ink spot

• The filter paper

How do substances move during chromatography?

• By changing color

• By reacting with the paper

• By dissolving in the solvent and bonding to the paper

• By evaporating into the air

What does the RF value represent in chromatography?

• The speed of the solvent

• The distance traveled by the paper

• The ratio of the distance traveled by the substance to the solvent

• The color intensity of the substance

How can a chemist identify a substance using RF values?

• By observing the size of the chromatogram

• By comparing RF values to a data book

• By measuring the color of the spots

• By noting the time taken for the experiment