State the difference between an emulsion and a suspension.

A student decided to investigate the composition of soil in her garden by shaking a small sample in a jar of water. After a few days, most of the material in the jar had settled at the bottom, but the water above the soil had a cloudy appearance. 

Interpret this information to make judgements about the density of the particles in the liquid layer and the particles in the precipitate at the bottom.

Calculate the ${\mathrm{R}}_{\mathrm{f}}$ values for green coloured spots in the below figure.

Calculate the ${\mathrm{R}}_{\mathrm{f}}$ values for yellow coloured spots in the below figure.

Calculate the ${\mathrm{R}}_{\mathrm{f}}$ values for blue coloured spots in the below figure.