Separation

How does a compound form?

• When two or more substances join together physically.

• When two or more elements combine together chemically.

• It forms with only one kind of atom.

Oxygen and hydrogen are elements. They are both pure substances.

• True

• False

What physical property is used to separate substances in distillation process?

• difference between the evaporation points of the mixed substances

• difference between the boiling points of the mixed substances

• difference between the freezing points of the mixed substances

Which two process are involved in distillation technique?

• Freezing and evaporation

• Evaporation and boiling

• Evaporation and condensation

Liquid "A" has a boiling point of 56 °C and liquid "B" has 78.37 °C. Which of the following method should be used to separate the two liquids?

• Chromatography

• Distillation

• Evaporation

Ink can be separated by a method of -----------------------------------------------

• distillation

• filtration

• chromatography

• sedimentation

chromatography separates the mixture of dyes on the basis of their ----------------------------

• density
• solubility
• gravity
• boiling point

On the chromatogram given -------------- is mixture.

• red
• orange
• green
• black

A pure substance shows ------------------ spot on chromatogram

• 0

• 1

• 2

• 3

A substance is soluble if it can be dissolved.

In paper chromatography, the most soluble solute _____________________ .

• does not move from the start point

• stays closest to the start point

• travels furthest away from the start point

• can be found in the middle of the chromatogram