Combined ScienceCode 5129
Elements, compounds and mixtures
What this topic asks you to be able to do
- Outline how elements, molecules, compounds and mixtures differ from one another
- Describe what is meant by each of these: a solvent, which is a substance able to dissolve a solute; a solute, which is a substance that has been dissolved in a solvent; a solution, meaning a mixture in which one or more solutes have been dissolved into a solvent
- Outline the procedure for separating soluble substances in a mixture by paper chromatography, selecting an appropriate solvent to use
- Interpret simple chromatograms in order to identify unknown substances, by comparing them with known ones, and to tell whether substances are pure or impure