purity, formulations and chromatography
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11 Terms
pure substance
a single element or compound, not mixed with any other substance
mixture
two or more substances that aren’t chemically bonded together
element
only one type of atom
compound
two or more atoms chemically combined together
why can melting point data help to distinguish between pure substances and mixtures?
pure elements and compounds melt and boil at specific temperatures
formulation
a mixture that has been designed as a useful product
examples of formulations
fuels, cleaning agents, paints, medicines
chromatography use
to separate mixtures and can give information to help identify substances
stationary phase
paper used in chromatography
mobile phase
solvent used in chromatography
Rf value
distance moved by the substance divided by the distance moved by the solvent