Chemical Analysis Flashcards
(13 cards)
Chromatogram
A graph showing the result of separating the components of a mixture by chromotography.
Chromotography
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.
Flame Emission Spectroscopy
An instrumental method used to analyse metal ions in solutions.
Flame Test
Qualitative tests used to identify metal ions (cation). Carried out by inserting a nichrome wire loop with the unknown compound on into a flame and observing the colour.
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.
Instrumental Methods
Used to detect and identify elements and compounds. They are accurate, sensitive, and rapid.
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 temporarily during chromatography. It is always a liquid or a 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
When the molecules are stationary during chromatography. It is a solid or a liquid supported on a solid.
