CF C8 Chemical Analysis

What is used to test for hydrogen gas?

• Burning splint

• Glowing splint

• Limewater

• Litmus paper

When damp litmus paper is put into chlorine gas the litmus paper turns ______

• blue

• green

• white

Chromatography involves a mobile phase and one other phase.

What is the other phase in chromatography?

• Moving phase

• Recycled phase

• Stationary phase

• Viscous phase

How many spots will be produced on the chromatogram of a pure compound?

In a chromatography experiment, a blue colour moved 4.77 cm.

The solvent moved 5.30 cm.

Calculate the Rf value for the blue colour.

What is used to test for oxygen gas?

• A burning splint

• A glowing splint

• Damp litmus paper

• Limewater

Ammonia is in a mixture that is used as a household cleaner.

A mixture that has been designed as a useful product is called a _______

Why was the green colour still on the start line at the end of the experiment?

• The experiment was left for too long

• The green colour was insoluble in the solvent

• The green spot contained too many colours

• The green spot was too small

A student calculated the Rf value of a colour to be 0.24

The colour moved 1.8 cm from the start line.

Calculate the distance the solvent moved.

Use the equation: Rf = distance moved by colour/ distance moved by solvent

Emissions from cars that burn fossil fuels contain carbon dioxide.

What is used to test for carbon dioxide?

• Burning splint

• Glowing splint

• Limewater