Science

Mixtures

A mixture is made from different substances that are not chemically joined. Because mixtures are not chemically they can easily separated.

Sometimes mixtures are hard to spot for example concrete.

Separating mixtures

The different substance in mixtures are usually easily separated from one another.

Solutions

When you swim in the sea you can taste the salt in the water even though you can't see it. when you stir sugar into the water, the sugar seems to disappear, but you know that it must still be there in some form because you can taste it.

Concentrated

Comparing solutions, it is important to know how much solute has been dissolved in the solvent. Terms dilute and concentrated to describe how strong a solution is.

Saturated

Solution will become saturated when no more solute will dissolve in the solvent. A solution that is saturated has a high concentrated. Solvent evaporates from a saturated solution, solution becomes super saturated and crystals of solute will start to form.

Separating Solutions.

Although a solution is a mixture , the solute cannot be separated from the solvent by filtration.

Distillation

Evaporation is a simple technique for separating a solid dissolved in a liquid. if we want to collect the solvent we need to trap the solvent as it evaporates and condense it back into liquid.

Chromatography 

Chroma is Greek for colour and graphy meaning pictures is a scientific technique used to separate a mixture of two or more coloured pigments, such as inks and dyes. the pigments separate because they have different solubilities in a solvent.