Which of these diagrams represents a pure compound?
Which is the correct description of these particles?
A mixture of compounds
A mixture of elements and compounds
A mixture of elements
How does filtration work?
The particles of dissolved solute are too large to pass through the filter
The solvent particles are too large to pass through the filter
The particles of insoluble solid are too large to pass through the filter
Which is the best way to obtain a dry sample of salt from a salt solution?
Filtration
Crystallisation
Fractional distillation
Which is the correct order for obtaining salt from a mixture of sand and salt?
Dissolving in water - filtration - crystallisation
Crystallisation - filtration - dissolving in water
Filtration - dissolving in water - crystallisation
The difference in which physical property allows mixtures of liquids to be separated by fractional distillation?
Density
Solubility
Boiling point
Which method is used to separate and identify coloured dyes from each other?
Paper chromatography
Simple distillation
What will the gas chromatogram of a pure substance show?
Two peaks with the same peak height
One peak
Two peaks with the same retention time
During thin layer chromatography, the solvent travels 10 cm and a coloured dye travels 4 cm. What is the Rf value of the dye?
4
0.6
0.4
Where are the spots of dye placed in thin layer chromatography?
Randomly on the chromatography plate
In a vertical line on the chromatography plate
In a horizontal line on the chromatography plate