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GCSE C 8
Topic 8 - Organic Chemical Analysis
| Term | Definition |
|---|---|
| Chromatogram | A graph that shows the result of separating the components of a mixture by chromatography. |
| Chromatography | A technique used to separate mixtures due to the distribution of the substances between the stationary and mobile phase. It can give information to help identify substances. |
| Formulation | A mixture that has been designed as a useful product. They are made by mixing the components in carefully measured quantities to ensure that the product has the required properties. |
| Impure substance | A substance made up of two or more elements or compounds that are not bonded together chemically. |
| Litmus paper | Paper stained with litmus which can be used to indicate the acidity or alkalinity of a substance. Used in the test for chlorine. |
| Mobile phase | Where the molecules can move during chromatography. It is always a liquid or gas. |
| Precipitation | The creation of a solid from a solution. |
| Pure substance | In chemistry a pure substance is a single element or compound, not mixed with any other substance. In everyday language, a pure substance can mean a substance that has had nothing added to it, so it is unadulterated and in its natural state. |
| Rf value | The ratio of the distance moved by a compound to the distance moved by the solvent. |
| Stationary phase | Where the molecules are stationary during chromatography. It is a solid or a liquid supported on a solid. |
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