Chromatography and Chemical Analysis Quiz

What is chromatography used for?

• To determine the boiling point of a substance

• To separate different substances dissolved in a liquid

• To measure the temperature of a solution

• To calculate the density of a liquid

What is the mobile phase in chromatography?

• The solvent that moves through the paper

• The container holding the solvent

• The ink used in the experiment

• The paper that does not move

What does a pure substance produce on a chromatogram?

• No spots

• Three spots

• Two spots

• One spot

What is the stationary phase in paper chromatography?

• The ink

• The paper

• The container

• The solvent

What does an impure substance produce on a chromatogram?

• One spot

• Two or more spots

• No spots

• A single line

What is the Rf value used for?

• To identify unknown chemicals

• To calculate the volume

• To determine the mass

• To measure the temperature

How is the Rf value calculated?

• Distance traveled by solvent divided by distance traveled by substance

• Distance traveled by substance divided by distance traveled by solvent

• Distance traveled by solvent plus distance traveled by substance

• Distance traveled by substance minus distance traveled by solvent

What does an Rf value of 0 indicate?

• The substance is pure

• The substance is highly soluble

• The substance is not attracted to the mobile phase

• The substance is not attracted to the stationary phase

What does an Rf value of 1 indicate?

• The substance is impure

• The substance is highly volatile

• The substance is not attracted to the mobile phase

• The substance is not attracted to the stationary phase

What is a chromatogram?

• A type of paper used in chromatography

• A type of solvent

• The results of separating mixtures by chromatography

• A device used to measure temperature