A material composed of only one type of atom (element) or only one type of molecule (compound)
Formulations
Mixture designed for a specific purpose in exact proportions to achieve a desired result or use. For example sun cream or drugs like aspirin.
Chromatography
A separation technique used to analyse and separate the components of mixtures based on their movement through the mobile phase and a stationary phase
Rf Value
Retention factor, a measure used in chromatography to identify and compare different substances. Ratio of the distance a substance travels to the distance travelled by the solvent, used for identification.
Mobile Phase
In chromatography, the part that moves (e.g., liquid or gas) carrying the sample through the paper
Stationary Phase
In chromatography, the immobile part for example paper. Where components interact differently
Test for Oxygen
Oxygen relights a glowing splint, indicating its presence
Test for Carbon Dioxide
Testing methods like limewater turning milky (white precipitate) to indicate the presence of carbon dioxide
Test for Chlorine
Damp litmus paper changes colour in response to Chlorine bleaching the litmus paper white
