Experimental techniques

Components of a mixture of liquids with different boiling points are separated by:

• 1 Sublimation
• 2 Filtration
• 3 Fractional distillation
• 4 Crystallisation

In paper chromatography, substances separate because of differences in:

• 1 Their attraction to the paper and the solvent
• 2 Density
• 3 Colour only
• 4 Mass only

Pure solid compounds are purified from solutions by:

• 1 Distillation
• 2 Centrifuge only
• 3 Crystallisation
• 4 Evaporation to dryness only

The Rf value in chromatography is the ratio of:

• 1 Solvent to substance
• 2 Distance moved by substance to distance moved by solvent
• 3 Temperature to time
• 4 Mass of substance to solvent

Solvent extraction works because a solute is:

• 1 A gas
• 2 Always ionic
• 3 A catalyst
• 4 More soluble in one solvent than another

Which technique separates a mixture of two liquids that do not mix?

• 1 Sublimation
• 2 Crystallisation
• 3 Separating funnel
• 4 Filtration

Sublimation is used to separate:

• 1 Sugar from water
• 2 Oil from water
• 3 Iodine from sand
• 4 Salt from water

Filtration separates:

• 1 Two liquids
• 2 Two gases
• 3 An insoluble solid from a liquid
• 4 Dissolved salts