What is the primary purpose of chromatography?

• To create new chemicals

• To change the color of substances

• To separate and identify substances in a mixture

• To mix different substances

What is the first step in paper chromatography?

• Place the filter paper in the solvent

• Draw a baseline with a pencil on the filter paper

• Add a sample of ink to the filter paper

• Add solvent to the beaker

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

• To make the experiment faster

• To keep the solvent from evaporating

• To prevent the paper from dissolving

• To ensure the ink spot moves up the paper

What is the mobile phase in paper chromatography?

• The solvent used

• The filter paper

• The beaker

• The ink spot

What is the stationary phase in paper chromatography?

• The ink spot

• The solvent used

• The filter paper

• The beaker

What determines how fast a chemical moves up the paper?

• The color of the ink

• The solubility of the chemical in the solvent

• The type of pencil used

• The size of the beaker

What is a chromatogram?

• A chemical used in chromatography

• A type of filter paper

• A pattern of spots left on the paper

• A type of solvent

How is the Rf value calculated?

• By multiplying the distance traveled by the substance by the distance traveled by the solvent

• By dividing the distance traveled by the solvent by the distance traveled by the substance

• By dividing the distance traveled by the substance by the distance traveled by the solvent

• By adding the distances traveled by the substance and the solvent

What happens if a pure substance is used in chromatography?

• It will change color

• It will not separate and form a single spot

• It will dissolve completely

• It will separate into multiple spots

Why might the Rf value change if a different solvent or paper is used?

• Because the beaker size is different

• Because the ink spot is larger

• Because the mobile or stationary phase has changed

• Because the experiment is done at a different time