Simple distillation is a method for separating the solvent from a solution, leaving behind the solute. This method works because the solvent has a much lower boiling point than the dissolved solute. Heating the solution allows the solvent to evaporate, and then it passes through a condenser, where it is cooled and condensed into a separate container. The solute does not evaporate and so it stays behind.
Fractional distillation is a method of separating multiple liquids from each other. The technique works in the same way as distillation, but on a much larger scale.
Atoms Elements And Compounds In Chemistry
Filtration is a method for separating an insoluble solid from a liquid. A mixture of liquid and solid is passed through filter paper into a flask below. The solid stays on the filter paper (residue), and the liquid passes through to the container below (filtrate).
Crystallisation/evaporation is a method that separates a soluble solid from a liquid. A solution of liquid and dissolved solid is heated, causing the solvent to evaporate and leaves solid crystals behind.
An atom is the smallest part of an element that can exist. An element is a substance made up of one type of atom while a compound is a substance formed by the chemical union of two or more. This video is an introduction to atoms, elements, compounds, mixtures and molecules for Key Stage 3 pupils (pupils in Years 7 and 8). It includes key definit.